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.EN
.nr LL 40.5P
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.po 4P

.rs
\v | 5i'
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\v'12P'
\s12PART\ I
\v'4P'
.RT
.ce 0
.sp 1P
.ce 1000
\fBI.100\(hySeries Recommendations\fR \v'2P'
.ce 0
.sp 1P
.ce 1000
\fBGENERAL\ STRUCTURE\fR 
.EF '%	 \ \ \ ^''
.OF ''' \ \ \ ^	%'
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\fBMONTAGE: PAGE 2 = PAGE BLANCHE\fR 
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.EF '%	Fascicle\ III.7\ \(em\ Rec.\ I.110''
.OF '''Fascicle\ III.7\ \(em\ Rec.\ I.110	%'
.LP
.bp
.sp 1P
.ce 1000
\v'3P'
SECTION\ 1
.ce 0
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\fBFRAME\ OF\ I\(hySERIES\ RECOMMENDATIONS\fR 
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\fBTERMINOLOGY\fR 
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\fBRecommendation\ I.110\fR 
.RT
.sp 2P
.ce 1000
\fBPREAMBLE\ AND\ GENERAL\ STRUCTURE\ OF\ THE\ I\(hySERIES\ RECOMMENDATIONS\fR 
.EF '%	Fascicle\ III.7\ \(em\ Rec.\ I.110''
.OF '''Fascicle\ III.7\ \(em\ Rec.\ I.110	%'
.ce 0
.sp 1P
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\fBFOR\ THE\ INTEGRATED\ SERVICES\ DIGITAL\ NETWORK\ (ISDN)\fR 
.ce 0
.sp 1P
.ce 1000
\fI(Malaga\(hyTorremolinos, 1984; amended at Melbourne, 1988)\fR 
.sp 9p
.RT
.ce 0
.sp 1P
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\fB1\fR 	\fBPreamble\fR 
.sp 1P
.RT
.sp 1P
.LP
1.1
	\fIIntroduction\fR 
.sp 9p
.RT
.PP
An ISDN is a network, in general evolving from a telephony
Integrated Digital Network (IDN), that provides end\(hyto\(hyend digital
connectivity to support a wide range of services, including voice and non\(hyvoice 
services, to which users have access by a limited set of standard multi\(hypurpose 
user\(hynetwork interfaces. 
.PP
This concept requires a family of CCITT Recommendations.
.PP
The I\(hySeries Recommendations will provide principles and
guidelines on the ISDN concept, as well as a detailed specification of the
user\(hynetwork and internetwork interfaces. They will further contain
suitable references so that the detailed Recommendations on specific elements 
within the network can continue to be developed in the appropriate 
Recommendation series.
.PP
Figure 1/I.110 produces a broad outline of the structure of the
I\(hySeries of Recommendations and their relationship to other
Recommendations. As shown in the Figure, the current structure of the I\(hySeries 
.PP
documentation is subdivided into seven major parts. Other I\(hySeries documents
may be added as the need arises. In addition, to support the implementation 
of the ISDN concepts, Recommendations have been produced and others will 
be 
produced in other Series by the appropriate specialist group (see
Recommendation\ I.111).
.RT
.sp 1P
.LP
1.2
	\fIBasis of the I\(hySeries approach\fR 
.sp 9p
.RT
.PP
In order to standardize all necessary aspects of ISDN the CCITT has divided 
the subject matter into a number of distinct (but obviously related) 
areas (see Figure\ 2/I.110). Three of these areas are the following:
.RT
.LP
	1)
	Services (I.200\(hySeries of Recommendations);
.LP
	2)
	Network aspects (I.300\(hySeries of Recommendations);
.LP
	3)
	User\(hynetwork access and interfaces (I.400\(hySeries of
Recommendations).
.PP
Network aspects are further supported by other Recommendations
both inside and outside the I\(hySeries.
.PP
The I\(hySeries Recommendations are directed at the following
principles:
.RT
.LP
	a)
	the standardization of services offered to subscribers, so
as to enable services to be internationally compatible;
.LP
	b)
	the standardization of user\(hynetwork interfaces, so as to
enable terminal equipment to be portable [and to assist in a)];
.LP
	c)
	the standardization of network capabilities to the degree
necessary to allow user\(hyto\(hynetwork and network\(hyto\(hynetwork
interworking, so as to achieve a) and b) above.
.bp
.LP
.rs
.sp 29P
.ad r
\fBFigure 1/I.110, p.\fR 
.sp 1P
.RT
.ad b
.RT
.PP
The distinction that has been made in this approach between
services and network capabilities is perhaps the most important. In the 
past, each service which was a candidate for standardization was treated 
in isolation and the necessary standards developed. For the ISDN, a wide 
range of services has to be considered in a coordinated manner. In addition, 
in the past there 
has not been a conscious decision to separate the definition of standards
required for services from the definition of the standards for the network
capabilities to support these services.
.PP
The approach, in the development of the I\(hySeries, has been, first, to 
establish the broad concepts of the two areas of standards, secondly, to 
uniquely define these two concepts, and thirdly, to show the relationship
between them.
.PP
The fourth area shown in Figure\ 2/I.110, is user equipment. The
I\(hySeries includes reference configurations which identify key functional
groupings and their physical relationship. The interfaces with the network 
are explicitly defined; however, the I\(hySeries does not provide a detailed 
description of any specific terminal element.
.RT
.PP
Figure 3/I.110 illustrates the relationship between services and network 
capability areas from a first\(hyorder viewpoint; nevertheless the 
relationship can be seen to be recursive. The figure shows that the driving
forces are:
.LP
	a)
	what the user wants or is prepared to purchase;
.LP
	b)
	the availability of the necessary technology;
.LP
	c)
	 the economics of developing and enhancing services and the network capabilities. 
.bp
.LP
.rs
.sp 17P
.ad r
\fBFigure 2/I.110, p.\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.rs
.sp 14P
.ad r
\fBFigure 3/I.110, p.\fR 
.sp 1P
.RT
.ad b
.RT
.sp 2P
.LP
\fB2\fR 	\fBList of Recommendations\fR 
.sp 1P
.RT
.sp 1P
.ce 1000
\fBPart\ I\ \(em\ General\ structure\ \(em\ I.100\(hySeries\fR 
.RT
.sp 2P
.ce 0
.sp 1P
.sp 2P
.LP
\fR SECTION\ 1\ \(em
	\fIFrame of I\(hySeries Recommendations \(em Terminology\fR 
.sp 1P
.RT
.sp 1P
.LP
I.110\fR 	Preamble and general structure of the I\(hySeries Recommendations
.sp 9p
.RT
.LP
I.111
	Relationship with other Recommendations relevant to ISDNs
.LP
I.112
	Vocabulary of terms for ISDNs
.LP
I.113
	Vocabulary of terms for broadband aspects of ISDNs
.sp 2P
.LP
SECTION\ 2\ \(em
	\fIDescription of ISDNs\fR 
.sp 1P
.RT
.sp 1P
.LP
I.120
	Integrated Service Digital Networks (ISDNs)
.sp 9p
.RT
.LP
I.121
	Broadband aspects of ISDNs
.LP
I.122
	Framework for providing additional packet mode services
.bp
.sp 2P
.LP
SECTION\ 3\ \(em
	\fIGeneral modelling methods\fR 
.sp 1P
.RT
.sp 1P
.LP
I.130
	The method for the characterization of telecommunication
services supported by an ISDN and network
capabilities of an ISDN
.sp 9p
.RT
.sp 2P
.LP
SECTION\ 4\ \(em
	\fITelecommunication network and science attributes\fR 
.sp 1P
.RT
.sp 1P
.LP
I.140
	Attribute technique for the characterization of telecommunication
services supported by an ISDN and network
capabilities of an ISDN
.sp 9p
.RT
.LP
I.141
	ISDN charging capability attributes
.sp 1P
.ce 1000
\fBPart\ II\ \(em\ Service capabilities\ \(em\ I.200\(hySeries\fR 
.RT
.sp 2P
.ce 0
.sp 1P
.LP
\fR I.200
	Guidance to the I.200\(hySeries of Recommendations
.sp 9p
.RT
.sp 2P
.LP
SECTION\ 1\ \(em
	\fIGeneral aspects of services in ISDN\fR 
.sp 1P
.RT
.sp 1P
.LP
I.210
	 Principles of telecommunication services supported by an ISDN and the 
means to describe them 
.sp 9p
.RT
.sp 2P
.LP
SECTION\ 2\ \(em
	\fICommon aspects of services in ISDN\fR 
.sp 1P
.RT
.sp 1P
.LP
I.220
	Common dynamic description of basic telecommunication services
.sp 9p
.RT
.LP
I.221
	Common specific characteristics of services
.sp 2P
.LP
SECTION\ 3\ \(em
	\fIBearer services supported by an ISDN\fR 
.sp 1P
.RT
.sp 1P
.LP
I.230
	Definition of bearer service categories
.sp 9p
.RT
.LP
I.231
	Circuit mode bearer service categories
.LP
I.232
	Packet mode bearer service categories
.sp 2P
.LP
SECTION\ 4\ \(em
	\fITeleservices supported by an ISDN\fR 
.sp 1P
.RT
.sp 1P
.LP
I.240
	Definition of teleservices
.sp 9p
.RT
.LP
I.241
	Teleservices supported by an ISDN
.sp 2P
.LP
SECTION\ 5\ \(em
	\fISupplementary services in ISDN\fR 
.sp 1P
.RT
.sp 1P
.LP
I.250
	Definition of supplementary services
.sp 9p
.RT
.LP
I.251
	Number identification supplementary services
.LP
I.252
	Call offering supplementary services
.LP
I.253
	Call completion supplementary services
.LP
I.254
	Multiparty supplementary services
.LP
I.255
	\*QCommunity of interest\*U supplementary services
.LP
I.256
	Charging supplementary services
.LP
I.257
	Additional information transfer supplementary services
.bp
.sp 1P
.ce 1000
\fBPart\ III\ \(em\ Overall network aspects and functions\ \(em\ I.300\(hySeries\fR 
.RT
.sp 2P
.ce 0
.sp 1P
.sp 2P
.LP
SECTION\ 1\ \(em
	\fINetwork functional principles\fR 
.sp 1P
.RT
.sp 1P
.LP
I.310
	ISDN \(em Network functional principles
.sp 9p
.RT
.sp 2P
.LP
SECTION\ 2\ \(em
	\fIReference models\fR 
.sp 1P
.RT
.sp 1P
.LP
I.320
	ISDN Protocol reference model
.sp 9p
.RT
.LP
I.324
	ISDN network architecture
.LP
I.325
	Reference configurations for ISDN connection types
.LP
I.326
	Reference configurations for relative network resource
requirements
.LP
I.32x
	ISDN hypothetical reference connections
.sp 2P
.LP
SECTION\ 3\ \(em
	\fINumbering, addressing and routing\fR 
.sp 1P
.RT
.sp 1P
.LP
I.330
	ISDN numbering and addressing principles
.sp 9p
.RT
.LP
I.331 (E.164)
	Numbering plan for the ISDN era
.LP
I.332
	Numbering principles for interwork between ISDNs and dedicated networks
with different numbering plans
.LP
I.333
	Terminal selection in ISDN
.LP
I.334
	Principles relating ISDN numbers/subaddress to the OSI reference
model network layer addresses
.LP
I.335
	ISDN routing principles
.sp 2P
.LP
SECTION\ 4\ \(em
	\fIConnection types\fR 
.sp 1P
.RT
.sp 1P
.LP
I.340
	ISDN connection types
.sp 9p
.RT
.sp 2P
.LP
SECTION\ 5\ \(em
	\fIPerformance objectives\fR 
.sp 1P
.RT
.sp 1P
.LP
I.350
	General aspects of Quality of Service and network performance in digital
networks, including ISDNs
.sp 9p
.RT
.LP
I.351
	Recommendations in other Series including network performance objectives
that apply at T\(hyreference points of an ISDN
.LP
I.352
	Network performance objectives for call processing delays
.sp 1P
.ce 1000
\fBPart\ IV\ \(em\ ISDN user\(hynetwork interfaces\ \(em\ I.400\(hySeries\fR 
.RT
.sp 2P
.ce 0
.sp 1P
.sp 2P
.LP
SECTION\ 1\ \(em
	\fIISDN user\(hynetwork interfaces\fR 
.sp 1P
.RT
.sp 1P
.LP
I.410
	General aspects and principles relating to
Recommendations on ISDN user\(hynetwork interfaces
.sp 9p
.RT
.LP
I.411
	ISDN user\(hynetwork interfaces \(em Reference configurations
.LP
I.412
	ISDN user\(hynetwork interfaces\ \(em
Interface structures and access capabilities
.sp 2P
.LP
SECTION\ 2\ \(em
	 \fIApplication of I\(hySeries Recommendations to\fR \fIISDN user\(hynetwork 
interfaces\fR 
.sp 1P
.RT
.sp 1P
.LP
I.420
	Basic user\(hynetwork interface
.sp 9p
.RT
.LP
I.421
	Primary rate user\(hynetwork interface
.bp
.sp 2P
.LP
SECTION\ 3\ \(em
	\fIISDN user\(hynetwork interfaces: Layer 1 Recommendations\fR 
.sp 1P
.RT
.sp 1P
.LP
I.430
	Basic user\(hynetwork interface \(em Layer 1 specification
.sp 9p
.RT
.LP
I.431
	Primary rate user\(hynetwork interface \(em Layer 1 specification
.LP
I.43x
	Higher rate user\(hynetwork interfaces
.sp 2P
.LP
SECTION\ 4\ \(em
	\fIISDN user\(hynetwork interfaces:\fR \fILayer 2 Recommendations\fR 
.sp 1P
.RT
.sp 1P
.LP
I.440 (Q.920)
	ISDN user\(hynetwork interface data link layer \(em
general aspects
.sp 9p
.RT
.LP
I.441 (Q.921)
	ISDN user\(hynetwork interface data link layer specification
.sp 2P
.LP
SECTION\ 5\ \(em
	\fIISDN user\(hynetwork interfaces:\fR \fILayer 3 Recommendations\fR 
.sp 1P
.RT
.sp 1P
.LP
I.450 (Q.930)
	ISDN user\(hynetwork interface layer 3 \(em general aspects
.sp 9p
.RT
.LP
I.451 (Q.931)
	ISDN user\(hynetwork interface layer 3 specification for basic call control
.LP
I.452 (Q.932)
	 ISDN user\(hynetwork interface layer 3 specification \(em generic procedures 
for the control of ISDN supplementary services 
.sp 2P
.LP
SECTION\ 6\ \(em
	\fIMultiplexing, rate adaptation and support of\fR \fIexisting interfaces\fR 
.sp 1P
.RT
.sp 1P
.LP
I.460
	Multiplexing, rate adaptation and support of
existing interfaces
.sp 9p
.RT
.LP
I.461 (X.30)
	Support of X.21 and X.21 | fIbis\fR and X.20 | fIbis\fR based Data Terminal
Equipments (DTEs) by an ISDN
.LP
I.462 (X.31)
	Support of packet mode terminal equipment by an ISDN
.LP
I.463 (V.110)
	Support of Data Terminal Equipments (DTEs) with
V\(hyseries type interfaces
by an ISDN
.LP
I.464
	Multiplexing, rate adaptation and support
of existing interfaces
for restricted 64 kbit/s transfer capability
.LP
I.465
	 Support by an ISDN of data terminal equipment with V\(hySeries type interfaces 
with provision for statistical multiplexing 
.sp 2P
.LP
SECTION\ 7\ \(em
	\fIAspects of ISDN affecting terminal requirements\fR 
.sp 1P
.RT
.sp 1P
.LP
I.470
	Relationship of terminal functions to ISDN
.sp 9p
.RT
.sp 1P
.ce 1000
\fBPart\ V\ \(em\ Internetwork interfaces\ \(em\ I.500\(hySeries\fR 
.RT
.sp 2P
.ce 0
.sp 1P
.LP
I.500
	General structure of ISDN interworking Recommendations
.sp 9p
.RT
.LP
I.510
	Definitions and general principles for ISDN interworking
.LP
I.511
	ISDN\(hyto\(hyISDN Layer 1 internetwork interface
.LP
I.515
	Parameter exchange for ISDN interworking
.LP
I.520
	General arrangements for network interworking between ISDNs
.LP
I.530
	Network interworking between an ISDN and a public switched telephone
network (PSTN)
.LP
I.540 (X.321)
	 General arrangements for interworking between Circuit\(hySwitched Public 
Data Networks (CSPDNS) and Integrated Services Digital Networks (ISDNs) 
for the 
provision of data transmission services
.LP
I.550 (X.325)
	 General arrangements for interworking between Packet Switched Public 
Data Networks (PSPDNs) and Integrated Services Digital Networks (ISDNs) 
for the 
provision of data services
.LP
I.560 (V.202)
	Requirements to be met in providing the telex service within the ISDN
.bp
.sp 1P
.ce 1000
\fBPart\ VI\ \(em\ Maintenance principles\ \(em\ I.600\(hySeries\fR 
.RT
.sp 2P
.ce 0
.sp 1P
.LP
I.601
	General maintenance principles of ISDN subscriber access and subscriber
installation
.sp 9p
.RT
.LP
I.602
	Application of maintenance principles to ISDN subscriber installation
.LP
I.603
	Application of maintenance principles to ISDN basic accesses
.LP
I.604
	Application of maintenance principles to ISDN primary rate accesses
.LP
I.605
	Application of maintenance principles to static multiplexed ISDN basic
accesses
\v'1P'
.sp 2P
.LP
\fBRecommendation I.111\fR 
.RT
.sp 2P
.sp 1P
.ce 1000
\fBRELATIONSHIP\ WITH\ OTHER\ RECOMMENDATIONS\ RELEVANT\ TO\ ISDNs\fR 
.EF '%	Fascicle\ III.7\ \(em\ Rec.\ I.111''
.OF '''Fascicle\ III.7\ \(em\ Rec.\ I.111	%'
.ce 0
.sp 1P
.ce 1000
\fI(Malaga\(hyTorremolinos, 1984; amended at Melbourne, 1988)\fR 
.sp 9p
.RT
.ce 0
.sp 1P
.PP
The I\(hySeries of Recommendations applies to the general concept and to 
the network capabilities of an ISDN mainly insofar as they appear at 
user\(hynetwork interfaces and internetwork interfaces. Moreover, the detailed
specifications of ISDN interfaces are contained in the I\(hySeries of
Recommendations.
.sp 1P
.RT
.PP
The specific aspects within the network, and ancillary features
that are necessary to support the above, will continue to be covered wholly 
or in part, by the appropriate Series of Recommendations. Such aspects 
may 
include:
.LP
	\(em
	technical characteristics of component parts and their
performance objectives (e.g.\ transmission systems, switching
systems, interexchange signalling systems);
.LP
	\(em
	network synchronization;
.LP
	\(em
	maintenance and operation;
.LP
	\(em
	services;
.LP
	\(em
	tariffs and charging.
.PP
Some of the existing Recommendations for telephony and other
dedicated service networks are directly applicable also to ISDNs. However,
other Recommendations in those Series may need to be developed in order to
cover applications in an ISDN.
.PP
References to other Recommendations relevant to ISDNs and/or used in developing 
I\(hySeries Recommendations are listed in Table\ 1/I.111. 
.RT
.LP
.rs
.sp 17P
.ad r
Blanc
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [T1.111]\fR 
.ce
TABLE\ 1/I.111
.ce
\fBReferences to other Recommendations relevant to ISDNs\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
cw(114p) | cw(114p) .
\fBvide\fR  	\fBvide\fR  
.T&
lw(114p) | lw(114p) .
 {
\fIAccess, user\(hynetwork (I.400\(hySeries)\fR
\(em
Q.920, Q.930 
\fIAdaptation, terminal (I.460\(hySeries)\fR
\(em
X.30, X.31
\(em
V.110, V.120 
\fIBearer services\fR
\(em
X.25, X.31, X.300
\(em
G.711 
\fICharging (I.141, I.326)\fR
\(em
D.93, D.200\(hySeries 
\fIDigital switching\fR
\(em
Q.500\(hySeries 
\fIDigital transmission\fR
\(em
G.700\(hySeries, G.800\(hySeries, G.900\(hySeries 
\fIExchange, digital local\fR
\(em
Q.511 to Q.517 
\fIInterworking: digital hierarchies\fR
\(em
G.802 
\fIInterworking, ISDN and other networks (I.500\(hySeries)\fR
\(em
X.1, X.2, X.10, X.15, X.25, X.30, X.31, X.71, X.75, X.81
\(em
X.180, X.181, X.300\(hySeries
\(em
V.110, V.120
\(em
U.12, U.202
\(em
Q.921, Q.931 
\fIInterworking, signalling systems\fR
\(em
Q.120 to Q.180, Q.251 to Q.300, Q.310 to Q.490
\(em
Q.600\(hySeries, Q.700\(hySeries
\(em
X.75 
\fIManagement and maintenance (I.600\(hySeries)\fR
\(em
M.20, M.21, M.22, M.24, M.30, M.36, M.40
\(em
M.122, M.125
\(em
M.250, M.251, M.550, M.555, M.557
\(em
M.770, M.782
\(em
G.601, G.700\(hySeries, G.821, G.900\(hySeries
\(em
Q.512, Q.542, Q.940 
\fIModelling (I.130\(hySeries, I.140\(hySeries, I.300\(hySeries)\fR
\(em
Q.65, Q.71, Q.80, Q.500\(hySeries, Q.700\(hySeries
\(em
X.200, X.300
\(em
Z.100\(hySeries 
\fINumbering (I.330\(hySeries)\fR
\(em
E.163, E.164, E.165, E.166, E.167
\(em
F.69
\(em
X.121, X.122, X.200
\(em
Q.921, Q.931, Q.932
\(em
T.90 
\fIParameter exchange (I.515)\fR
\(em
V.32, V.100, V.110, V.120
\(em
G.725
\(em
X.21, X.21 | fIbis\fR
, X.25, X.30, X.31
\(em
Q.931, Q.932, Q.764
 }	 {
\fIPerformance (I.350\(hySeries)\fR
\(em
G.100\(hySeries
\(em
G.821, G.822, G.823 and G.824
\(em
P.56, P.66 and P.84 
\fIProtection\fR
\(em
K.20
\(em
K.22
\(em
K.23
\fIRouting (I.335)\fR
\(em
E.164, E.170 to E.172, E.502
\(em
G.801
\(em
X.110
\(em
Q.600\(hySeries, Q.700\(hySeries, Q.930, Q.931 
\fISignalling, user\(hynetwork (I.440\(hySeries, I.450\(hySeries)\fR
\(em
Q.920 to Q.940 
\fISignalling, inter\(hyexchange (SS No. 7)\fR
\(em
Q.701 to Q.714, Q.761 to Q.766, Q.771 to Q.774 
\fISpeech encoding\fR
\(em
G.711, G.721, G.722, G.723, G.725 
\fISupplementary services (I.250\(hySeries)\fR
\(em
Q.932
\(em
Q.71 to Q.99
\(em
X.2 
\fISwitching\fR
\(em
Q.500\(hySeries 
\fITelephony, transmission quality\fR
\(em
G.100\(hySeries 
\fITeleservices (I.240\(hySeries)\fR
\(em
E\(hySeries
\(em
F\(hySeries
\(em
X\(hySeries
\(em
T\(hySeries
\(em
U.201
\(em
G.711, G.722
\fITerminals (I.470)\fR
\(em
T.90
\(em
E.330, E.331
\(em
P.31
\(em
V.110, V.120, V.230
\fITones and announcements (I.530)\fR
\(em
E.184
\(em
V.25 
\fR
\fITransmission\fR
\(em
G.700\(hySeries, G.800\(hySeries, G.900\(hySeries 
\fIVocabulary (I.112, I.113)\fR
\(em
G.701 
 }
_
.TE
.nr PS 9
.RT
.ad r
\fBTableau 1/I.111 [T1.111], p. 4\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.sp 2P
.LP
\fBRecommendation\ I.112\fR 
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\fBVOCABULARY\ OF\ TERMS\ FOR\ ISDNs\fR 
.EF '%	Fascicle\ III.7\ \(em\ Rec.\ I.112''
.OF '''Fascicle\ III.7\ \(em\ Rec.\ I.112	%'
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\fI(Malaga\(hyTorremolinos, 1984; amended at Melbourne, 1988)\fR 
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\fB1\fR 	\fBIntroduction\fR 
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.RT
.PP
This Recommendation consists primarily of those terms and
definitions that are considered essential to the understanding and application 
of the principles of an Integrated Services Digital Network (ISDN). They 
are not exclusive to ISDNs and are also recommended for application, insofar 
as 
they are relevant, to other types of telecommunication networks.
.PP
Included are some terms that are already defined in other
Recommendations. However, the definitions given here embrace only the essential 
concepts and on that basis it is considered that they are not inconsistent 
with the more specialized definitions that appear in those other Recommendations. 
.PP
A small number of the terms and definitions in this Recommendation are 
duplicated in Recommendation\ G.701. References to these definitions are 
given in brackets, for example { 00 }  as an aid to ensuring consistency 
between 
the two Recommendations in the event of future amendments.
.PP
According to the conventions applied in this Recommendation, any term in 
common usage but whose use is deprecated in the sense defined, is shown 
as in the following example: \*Q419\ functional group [functional grouping]\*U. 
.PP
Where a truncated term is widely used in an understood context the
complete term is quoted following the colloquial form, for example,
\*Q111\ circuit, telecommunication circuit\*U.
.PP
Annex A to this Recommendation contains an alphabetical list of all of 
the terms contained in this Recommendation. 
.RT
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CONTENTS
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2.1
	General
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.RT
.LP
2.2
	Services
.LP
2.3
	Networks
.LP
2.4
	Access
.LP
2.5
	Signalling
.sp 1P
.LP
\fIAnnex\ A\fR \ \(em\ Alphabetical List
\v'1P'
.sp 9p
.RT
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.LP
\fB2\fR 	\fBVocabulary of terms\fR 
.sp 1P
.RT
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2.1
	\fIGeneral\fR 
.sp 9p
.RT
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.LP
101
	\fBcommunication\fR 
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.LP
	\fIF:\fR 	\fIcommunication\fR 
.LP
	\fIS:\fR 	\fIcomunicaci\*'on\fR 
.PP
The transfer of information according to agreed conventions.
.PP
\fINote\fR \ \(em\ In French and Spanish the corresponding terms
\*Qcommunications\*U and \*Qcomunicaci\*'on\*U have additional specific 
meanings in 
telecommunication.
.RT
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102
	\fBsignal\fR { 00 }
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.LP
	\fIF:\fR 	\fIsignal\fR 
.LP
	\fIS:\fR 	\fIse\o"n~"al\fR 
.PP
A physical phenomenon one or more of whose characteristics may
vary to represent information.
.bp
.RT
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103
	\fBanalogue signal\fR { 00 }
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIsignal analogique\fR 
.LP
	\fIS:\fR 	\fIse\o"n~"al anal\*'ogica\fR 
.PP
A signal one of whose characteristic quantities follows
continuously the variations of another physical quantity representing
information.
.RT
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104
	\fBdiscretely\(hytimed signal\fR { 00 }
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIsignal (temporel) discret\fR 
.LP
	\fIS:\fR 	\fIse\o"n~"al discretamente temporizada\fR 
.PP
A signal composed of successive elements in time, each element
having one or more characteristics which can convey information, for example, 
its duration, its waveform and its amplitude. 
.RT
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105
	\fBdigital signal\fR { 00 }
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIsignal num\*'erique\fR 
.LP
	\fIS:\fR 	\fIse\o"n~"al digital\fR 
.PP
A discretely\(hytimed signal in which information is represented by a number 
of well\(hydefined discrete values that one of its characteristic 
quantities may take in time.
.PP
\fINote\fR \ \(em\ The term may be qualified to indicate the digit rate, for
example: \*Q140\ Mbit/s digital signal\*U.
.RT
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106
	\fBtransmission\fR { 00 }
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.LP
	\fIF:\fR 	\fItransmission\fR 
.LP
	\fIS:\fR 	\fItransmisi\*'on\fR 
.PP
The action of conveying signals from one point to one or more
other points.
.PP
\fINote\ 1\fR \ \(em\ Transmission can be effected directly or indirectly, 
with or without intermediate storage. 
.PP
\fINote\ 2\fR \ \(em\ The use of the English word \*Qtransmission\*U in 
the sense of \*Qemission\*U is deprecated. 
.RT
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107
	\fBdigital transmission\fR { 00 }
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.LP
	\fIF:\fR 	\fItransmission num\*'erique\fR 
.LP
	\fIS:\fR 	\fItransmisi\*'on digital\fR 
.PP
The transmission of digital signals by means of a channel or
channels that may assume in time any one of a defined set of discrete
states.
.RT
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108
	\fBchannel, transmission channel\fR { 00 }
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.LP
	\fIF:\fR 	\fIvoie, voie de transmission\fR 
.LP
	\fIS:\fR 	\fIcanal, canal de transmisi\*'on\fR 
.PP
A means of unidirectional transmission of signals between two
points.
.PP
\fINote\ 1\fR \ \(em\ Several channels may share a common path; for example 
each channel may be allocated a particular frequency band or a particular 
time 
slot.
.PP
\fINote\ 2\fR \ \(em\ The term may be qualified by the nature of the transmitted 
signals, by the bandwidth, by the digit rate, or by an arbitrary designation. 
.PP
\fINote\ 3\fR \ \(em\ See also Term 414, access channel.
.bp
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109
	\fBdigital channel, digital transmission channel\fR { 00 }
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.LP
	\fIF:\fR 	\fIvoie num\*'erique, voie de transmission num\*'erique\fR 
.LP
	\fIS:\fR 	\fIcanal digital, canal de transmisi\*'on digital\fR 
.PP
The means of unidirectional digital transmission of digital
signals between two points.
.RT
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110
	\fBtelecommunication\fR { 00 }
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.LP
	\fIF:\fR 	\fIt\*'el\*'ecommunication\fR 
.LP
	\fIS:\fR 	\fItelecomunicaci\*'on\fR 
.PP
Any transmission and/or emission and reception of signals
representing signs, writing, images and sounds or intelligence of any nature 
by wire, radio, optical or other electromagnetic systems. 
.RT
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111
	\fBcircuit, telecommunication circuit\fR { 00 }
.sp 9p
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.LP
	\fIF:\fR 	\fIcircuit, circuit de t\*'el\*'ecommunications\fR 
.LP
	\fIS:\fR 	\fIcircuito, circuito de telecomunicaci\*'on\fR 
.PP
A combination of two transmission channels permitting
bi\(hydirectional transmission of signals between two points, to support 
a single communication. 
.PP
\fINote\ 1\fR \ \(em\ If the telecommunication is by nature unidirectional 
(for example: long distance television transmission), the term \*Qcircuit\*U 
is 
sometimes used to designate the single channel providing the facility.
.PP
\fINote\ 2\fR \ \(em\ In a telecommunication network use of the term \*Qcircuit\*U 
is generally limited to a telecommunication circuit directly connecting 
two 
switching devices or exchanges, together with associated terminating
equipment.
.PP
\fINote\ 3\fR \ \(em\ A telecommunication circuit may permit transmission 
in both directions simultaneously (duplex) or not simultaneously (simplex). 
.PP
\fINote\ 4\fR \ \(em\ A telecommunication circuit that is used for transmission 
in one direction only is sometimes referred to as a unidirectional 
telecommunication circuit. A telecommunication circuit that is used for
transmission in both directions (whether simultaneously or not) is sometimes
referred to as a bidirectional telecommunication circuit.
.RT
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112
	\fBdigital circuit, digital telecommunication circuit\fR { 00 }
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIcircuit num\*'erique, circuit num\*'erique de\fR 
\fIt\*'el\*'ecommunications\fR 
.LP
	\fIS:\fR 	\fIcircuito digital, circuito de telecomunicaci\*'on\fR 
\fIdigital\fR 
.PP
A combination of two digital transmission channels permitting
bidirectional digital transmission between two points, to support a single
communication.
.PP
\fINote\ 1\fR \ \(em\ If the telecommunication is by nature unidirectional 
(for example: long distance television transmission), the term \*Qdigital 
circuit\*U is sometimes used to designate the single digital channel providing 
the facility. 
.PP
\fINote\ 2\fR \ \(em\ In a telecommunication network, use of the term \*Qdigital 
circuit\*U is generally limited to a digital telecommunication circuit 
directly connecting two switching devices or exchanges, together with associated 
terminating equipment.
.PP
\fINote\ 3\fR \ \(em\ A digital telecommunication circuit may permit transmission 
in both directions simultaneously (duplex), or not simultaneously (simplex). 
.PP
\fINote\ 4\fR \ \(em\ A digital telecommunication circuit that is used for
transmission in one direction only is sometimes referred to as a unidirectional 
digital telecommunication circuit. A digital telecommunication circuit 
that is used for transmission in both directions (whether simultaneously 
or not) is 
sometimes referred to as a bidirectional digital telecommunication
circuit.
.RT
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113
	\fBswitching\fR 
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.LP
	\fIF:\fR 	\fIcommutation\fR 
.LP
	\fIS:\fR 	\fIconmutaci\*'on\fR 
.PP
The process of interconnecting functional units, transmission
channels or telecommunication circuits for as long as is required to convey
signals.
.bp
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114
	\fBdigital switching\fR 
.sp 9p
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.LP
	\fIF:\fR 	\fIcommutation num\*'erique\fR 
.LP
	\fIS:\fR 	\fIconmutaci\*'on digital\fR 
.PP
Switching by means that may assume in time any one of a defined
set of discrete signal states, in order to convey digital signals.
.RT
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115
	\fBexchange\fR 
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.LP
	\fIF:\fR 	\fIcommutateur [central]\fR 
.LP
	\fIS:\fR 	\fIcentral\fR 
.PP
An aggregate of traffic carrying devices, switching stages,
controlling and signalling means, and other functional units at a network 
node that enables subscriber lines, telecommunication circuits and/or other 
functional units to be interconnected as required by individual users.
.RT
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116
	\fBdigital exchange\fR 
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.LP
	\fIF:\fR 	\fIcommutateur num\*'erique\fR 
.LP
	\fIS:\fR 	\fIcentral digital\fR 
.PP
An exchange that switches digital signals by means of digital
switching.
.RT
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117
	\fBintegrated digital transmission and switching\fR 
.sp 9p
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.LP
	\fIF:\fR 	\fItransmission et commutation num\*'eriques int\*'egr\*'ees\fR 
.LP
	\fIS:\fR 	\fItransmisi\*'on y conmutaci\*'on digitales integradas\fR 
.PP
The direct (digital) concatenation of digital transmission and
digital switching, that maintains a continuous digital transmission path.
.RT
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2.2
	\fIServices\fR 
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201
	\fBservice, telecommunication service\fR 
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.LP
	\fIF:\fR 	\fIservice, service de t\*'el\*'ecommunications\fR 
.LP
	\fIS:\fR 	\fIservicio, servicio de telecomunicaci\*'on\fR 
.PP
That which is offered by an Administation or RPOA to its customers in order 
to satisfy a specific telecommunication requirement. 
.PP
\fINote\fR \ \(em\ Bearer service and teleservice are types of telecommunication 
service. Other types of telecommunication service may be identified in 
the 
future.
.RT
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202
	\fBbearer service\fR 
.sp 9p
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.LP
	\fIF:\fR 	\fIservice support\fR 
.LP
	\fIS:\fR 	\fIservicio portador\fR 
.PP
A type of telecommunication service that provides the capability for the 
transmission of signals between user\(hynetwork interfaces. 
.PP
\fINote\fR \ \(em\ The ISDN connection type used to support a bearer service 
may be identical to that used to support other types of telecommunication 
service. 
.RT
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203
	\fBteleservice [telecommunication service]\fR 
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.LP
	\fIF:\fR 	\fIt\*'el\*'eservice\fR 
.LP
	\fIS:\fR 	\fIteleservicio, servicio final\fR 
.PP
A type of telecommunication service that provides the complete
capability, including terminal equipment functions, for communication between 
users according to protocols established by agreement between Administrations 
and/or RPOAs. 
.bp
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204
	\fBteleaction service [telemetry service]\fR 
.sp 9p
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.LP
	\fIF:\fR 	\fIservice de t\*'el\*'eaction [service de t\*'el\*'emesure]\fR 
.LP
	\fIS:\fR 	\fIservicio de teleacci\*'on\fR 
.PP
A type of telecommunication service that uses short messages,
requiring a very low transmission rate, between the user and the network.
.PP
\fINote\fR \ \(em\ Examples of teleaction services are: telealarm, telecommand, 
telealerting. 
.RT
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205
	\fBdemand service, demand telecommunication service\fR 
.sp 9p
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.LP
	\fIF:\fR 	\fIservice \*`a la demande, service de t\*'el\*'ecommunications\fR 
\fI\*`a la demande \fR 
.LP
	\fIS:\fR 	\fIservicio por demanda, servicio de telecomunicaci\*'on\fR 
\fIpor demanda\fR 
.PP
A type of telecommunication service in which the communication
path is established almost immediately, in response to a user request effected 
by means of user\(hynetwork signalling. 
.RT
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206
	\fBreserved circuit service, reserved circuit telecommunication
service\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIservice de circuit r\*'eserv\*'e, service de circuit de\fR 
\fIt\*'el\*'ecommunications r\*'eserv\*'e\fR 
.LP
	\fIS:\fR 	\fIservicio de circuito reservado, servicio de\fR 
\fItelecomunicaci\*'on de circuito reservado\fR 
.PP
A type of telecommunication service in which the communication
path is established at a time specified in advance by the user, in response 
to a user request effected by means of user\(hynetwork signalling. 
.PP
\fINote\fR \ \(em\ The duration of the communication, or the time of release 
of the communication path, may also be specified in advance by the user. 
.RT
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207
	\fBpermanent circuit service, permanent circuit telecommunication
service\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIservice de circuit permanent, service de circuit de\fR 
\fIt\*'el\*'ecommunications permanent\fR 
.LP
	\fIS:\fR 	\fIservicio de circuito permanente, servicio de\fR 
\fItelecomunicaci\*'on de circuito permanente\fR 
.PP
A type of telecommunication service in which the communication
path is established in response to a customer request effected by means 
of an operational or administrative message. 
.PP
\fINote\fR \ \(em\ Release of the communication path is effected in a similar
way to its establishment.
.RT
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208
	\fBservice attribute, telecommunication service attribute\fR 
.sp 9p
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.LP
	\fIF:\fR 	\fIattribut de service, attribut de service de\fR 
\fIt\*'el\*'ecommunications\fR 
.LP
	\fIS:\fR 	\fIatributo de servicio, atributo de servicio de\fR 
\fItelecomunicaci\*'on\fR 
.PP
A specified characteristic of a telecommunication service.
.PP
\fINote\fR \ \(em\ The value(s) assigned to one or more service attributes 
may be used to distinguish that telecommunication service from others. 
.RT
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2.3
	\fINetworks\fR 
.sp 1P
.RT
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301
	\fBlink, transmission link\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIliaison, liaison de transmission\fR 
.LP
	\fIS:\fR 	\fIenlace, enlace de transmisi\*'on\fR 
.PP
A means of transmission with specified characteristics between two points.
.PP
\fINote\fR \ \(em\ The type of the transmission path or the capacity is 
normally indicated, e.g.\ radio link, coaxial link, or 2048\ kbit/s link. 
.RT
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302
	\fBdigital link, digital transmission link\fR { 00 }
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIliaison num\*'erique, liaison de transmission num\*'erique\fR 
.LP
	\fIS:\fR 	\fIenlace digital, enlace de transmisi\*'on digital\fR 
.PP
The whole of the means of digital transmission of a digital signal of specified 
rate between two digital distribution frames (or equivalent). 
.bp
.PP
\fINote\ 1\fR \ \(em\ A digital link comprises one or more digital sections 
and may include multiplexing and/or demultiplexing, but not switching. 
.PP
\fINote\ 2\fR \ \(em\ The term may be qualified to indicate the transmission
medium used, for example: \*Qdigital satellite link\*U.
.PP
\fINote\ 3\fR \ \(em\ The term always applies to the combination of \*Qgo\*U 
and 
\*Qreturn\*U directions of transmission, unless stated otherwise.
.PP
\fINote\ 4\fR \ \(em\ The term \*Qdigital path\*U is sometimes used to 
describe one or more digital links connected in tandem, especially between 
equipments at 
which the signals of the specified rate originate and terminate.
.RT
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303
	\fBnode, switching node\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fInoeud, noeud de commutation\fR 
.LP
	\fIS:\fR 	\fInodo, nodo de conmutaci\*'on\fR 
.PP
A point at which switching occurs.
.PP
\fINote\fR \ \(em\ The term \*Qnode\*U is sometimes used to refer to a point at
which circuits are interconnected by means other than switching. In such a
.PP
case a suitable qualification should be used, for example: \*Qsynchronization
node\*U.
.RT
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304
	\fBdigital switching node\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fInoeud de commutation num\*'erique\fR 
.LP
	\fIS:\fR 	\fInodo de conmutaci\*'on digital\fR 
.PP
A node at which digital switching occurs.
.RT
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305
	\fBnetwork, telecommunication network\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIr\*'eseau, r\*'eseau de t\*'el\*'ecommunications\fR 
.LP
	\fIS:\fR 	\fIred, red de telecomunicaci\*'on\fR 
.PP
A set of nodes and links that provides connections between two or more 
defined points to facilitate telecommunication between them. 
.RT
.sp 1P
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306
	\fBdigital network, integrated digital network\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIr\*'eseau num\*'erique, r\*'eseau num\*'erique int\*'egr\*'e\fR 
.LP
	\fIS:\fR 	\fIred digital, red digital integrada\fR 
.PP
A set of digital nodes and digital links that uses integrated
transmission and switching to provide digital connections between two or 
more defined points to facilitate telecommunication between them. 
.RT
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307
	\fBintegrated services network\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIr\*'eseau avec int\*'egration des services\fR 
.LP
	\fIS:\fR 	\fIred de servicios integrados\fR 
.PP
A network that provides or supports a range of different
telecommunication services.
.RT
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308
	\fBintegrated services digital network (ISDN)\fR 
.sp 9p
.RT
.LP
	 \fIF:\fR \fIr\*'eseau num\*'erique avec int\*'egration des services (RNIS)\fR 
.LP
	\fIS:\fR 	\fIred digital de servicios integrados (RDSI)\fR 
.PP
An integrated services network that provides digital connections between 
user\(hynetwork interfaces. 
.RT
.sp 1P
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309
	\fBconnection\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIconnexion, cha\* | ne de connexion\fR 
.LP
	\fIS:\fR 	\fIconexi\*'on\fR 
.PP
A concatenation of transmission channels or telecommunication
circuits, switching and other functional units set up to provide for the
transfer of signals between two or more points in a telecommunication network, 
to support a single communication. 
.bp
.RT
.sp 1P
.LP
310
	\fBdigital connection\fR { 00 }
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIconnexion num\*'erique\fR 
.LP
	\fIS:\fR 	\fIconexi\*'on digital\fR 
.PP
A concatenation of digital transmission channels or digital
telecommunication circuits, switching and other functional units set up to
provide for the transfer of digital signals between two or more points in a
telecommunication network, to support a single communication.
.RT
.sp 1P
.LP
311
	\fBswitched connection\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIconnexion commut\*'ee\fR 
.LP
	\fIS:\fR 	\fIconexi\*'on conmutada\fR 
.PP
A connection that is established by means of switching.
.PP
\fINote\fR \ \(em\ A switched connection may be used to support both demand 
and reserved circuit services. 
.RT
.sp 1P
.LP
312
	\fBnon\(hyswitched connection\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIconnexion non commut\*'ee\fR 
.LP
	\fIS:\fR 	\fIconexi\*'on no conmutada\fR 
.PP
A connection that is established without the use of switching,
for example by means of hard\(hywired joints.
.RT
.sp 1P
.LP
313
	\fBexchange connection\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIconnexion de commutateur\fR 
.LP
	\fIS:\fR 	\fIconexi\*'on de central\fR 
.PP
A connection that is established through an exchange, between the terminations 
on that exchange, of two or more channels or circuits. 
.RT
.sp 1P
.LP
314
	\fBISDN connection\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIconnexion RNIS\fR 
.LP
	\fIS:\fR 	\fIconexi\*'on de RDSI\fR 
.PP
A connection that is established through an ISDN between specified ISDN 
interfaces. 
.RT
.sp 1P
.LP
315
	\fBconnection attribute, ISDN connection attribute\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIattribut de connexion, attribut de connexion RNIS\fR 
.LP
	\fIS:\fR 	\fIatributo de conexi\*'on, atributo de conexi\*'on de RDSI\fR 
.PP
A specified characteristic of an ISDN connection.
.PP
\fINote\fR \ \(em\ The value(s) assigned to one or more connection attributes
may be used to distinguish that connection from others.
.RT
.sp 1P
.LP
316
	\fBconnection type, ISDN connection type\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fItype de connexion, type de connexion RNIS\fR 
.LP
	\fIS:\fR 	\fItipo de conexi\*'on, tipo de conexi\*'on de RDSI\fR 
.PP
A description of a set of ISDN connections that consists of stated values 
of one or more ISDN connection attributes. 
.RT
.sp 1P
.LP
317
	\fBconnection element, ISDN connection element\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fI\*'el\*'ement de connexion, \*'el\*'ement de connexion RNIS\fR 
.LP
	\fIS:\fR 	\fIelemento de conexi\*'on, elemento de conexi\*'on de RDSI\fR 
.PP
A part of an ISDN connection which has stated values of one
or more ISDN connection attributes.
.bp
.RT
.sp 1P
.LP
318
	\fBswitched connection element, switched ISDN connection element\fR 
.sp 9p
.RT
.LP
	 \fIF:\fR \fI\*'el\*'ement de connexion commut\*'ee, \*'el\*'ement de 
connexion RNIS\fR \fIcommut\*'ee\fR 
.LP
	 \fIS:\fR \fIelemento de conexi\*'on conmutada, elemento de conexi\*'on\fR 
\fIconmutada de RDSI\fR 
.PP
An ISDN connection element that is established by means of
switching.
.RT
.sp 1P
.LP
319
	\fBnon\(hyswitched connection element, non\(hyswitched ISDN connection
element\fR 
.sp 9p
.RT
.LP
	 \fIF:\fR \fI\*'el\*'ement de connexion non commut\*'ee, \*'el\*'ement 
de connexion\fR \fIRNIS non commut\*'ee\fR 
.LP
	\fIS:\fR 	\fIelemento de conexi\*'on no conmutada, elemento de\fR 
\fIconexi\*'on no conmutada de RDSI\fR 
.PP
An ISDN connection element that is established without
switching.
.RT
.sp 1P
.LP
320
	\fBpoint\(hyto\(hypoint ISDN connection\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIconnexion RNIS point\(hy\*`a\(hypoint\fR 
.LP
	\fIS:\fR 	\fIconexi\*'on de RDSI punto a punto\fR 
.PP
An ISDN connection that is established between two specified ISDN  interfaces.
.RT
.sp 1P
.LP
321
	\fBpoint\(hyto\(hymultipoint ISDN connection\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIconnexion RNIS point\(hymultipoints\fR 
.LP
	\fIS:\fR 	\fIconexi\*'on de RDSI punto a multipunto\fR 
.PP
An ISDN connection that is established between a single specified ISDN 
interface, and more than one other specified ISDN interface. 
.RT
.sp 2P
.LP
2.4
	\fIAccess\fR 
.sp 1P
.RT
.sp 1P
.LP
401
	\fBuser, user of a telecommunication network\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIusager, usager d'un r\*'eseau de t\*'el\*'ecommunications\fR 
.LP
	\fIF:\fR 	\fIusuario, usuario de una red de telecomunicaci\*'on\fR 
.PP
A person or machine delegated by a customer to use the services
and/or facilities of a telecommunication network.
.RT
.sp 1P
.LP
402
	\fBuser access, user\(hynetwork access\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIacc\*`es d'usager, acc\*`es d'usager\(hyr\*'eseau\fR 
.LP
	\fIS:\fR 	\fIacceso de usuario, acceso usuario\(hyred\fR 
.PP
The means by which a user is connected to a telecommunication
network in order to use the services and/or facilities of that network.
.RT
.sp 1P
.LP
403
	\fBfunction\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIfonction\fR 
.LP
	\fIS:\fR 	\fIfunci\*'on\fR 
.PP
A set of processes defined for the purpose of achieving a
specified objective.
.PP
\fINote\fR \ \(em\ Functions may be ordered in a logical hierarchy.
.RT
.sp 1P
.LP
404
	\fBlayer [level]\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIcouche [niveau]\fR 
.LP
	\fIS:\fR 	\fIcapa [nivel]\fR 
.PP
A conceptual region that embodies one or more functions between an upper 
and a lower logical boundary within a hierarchy of functions. 
.PP
\fINote\fR \ \(em\ The Open Systems Interconnection (OSI) reference model has
seven layers.
.bp
.RT
.sp 1P
.LP
405
	\fBprotocol\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIprotocole\fR 
.LP
	\fIS:\fR 	\fIprotocolo\fR 
.PP
A formal statement of the procedures that are adopted to ensure
communication between two or more functions within the same layer of a
hierarchy of functions.
.RT
.sp 1P
.LP
406
	\fBaccess protocol\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIprotocole d'acc\*`es\fR 
.LP
	\fIS:\fR 	\fIprotocolo de acceso\fR 
.PP
A defined set of procedures that is adopted at an interface at a specified 
reference point between a user and a network to enable the user to 
employ the services and/or facilities of that network.
.RT
.sp 1P
.LP
407
	\fBuser\(hyuser protocol\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIprotocole d'usager \*`a usager\fR 
.LP
	\fIS:\fR 	\fIprotocolo usuario\(hyusuario\fR 
.PP
A protocol that is adopted between two or more users in order to ensure 
communication between them. 
.RT
.sp 1P
.LP
408
	\fBinterface\fR { 00 }
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIinterface\fR 
.LP
	\fIS:\fR 	\fIinterfaz\fR 
.PP
The common boundary between two associated systems.
.RT
.sp 1P
.LP
409
	\fBuser\(hynetwork interface\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIinterface usager\(hyr\*'eseau\fR 
.LP
	\fIS:\fR 	\fIinterfaz usuario\(hyred\fR 
.PP
The interface between the terminal equipment and a network
termination at which interface the access protocols apply.
.RT
.sp 1P
.LP
410
	\fBlayer interface\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIinterface de couche\fR 
.LP
	\fIS:\fR 	\fIinterfaz de capa\fR 
.PP
The interface between adjacent layers of hierarchy of
layers.
.RT
.sp 1P
.LP
411
	\fBphysical interface\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIinterface physique\fR 
.LP
	\fIS:\fR 	\fIinterfaz f\*'isico\fR 
.PP
The interface between two equipments.
.RT
.sp 1P
.LP
412
	\fBinterface specification\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIsp\*'ecification d'interface\fR 
.LP
	\fIS:\fR 	\fIespecificaci\*'on de interfaz\fR 
.PP
A formal statement of the type, quantity, form and order of the
interconnections and interactions between two associated systems, at their
interface.
.RT
.sp 1P
.LP
413
	\fBphysical interface specification [physical interface]\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIsp\*'ecification d'interface physique [interface physique]\fR 
.LP
	\fIS:\fR 	\fIespecificaci\*'on de interfaz f\*'isico [interfaz f\*'isico]\fR 
.PP
A formal statement of the mechanical, electrical, electromagnetic and optical 
characteristics of the interconnections and interactions between 
two associated equipments, at their interface.
.bp
.RT
.sp 1P
.LP
414
	\fBaccess channel [channel]\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIcanal d'acc\*`es [canal]\fR 
.LP
	\fIS:\fR 	\fIcanal de acceso [canal]\fR 
.PP
A designated part of the information transfer capability having
specified characteristics, provided at the user\(hynetwork interface:
.PP
\fINote\ 1\fR \ \(em\ The term \*Qtransmission channel\*U is well understood 
to imply unidirectional working only, and then is commonly abbreviated 
to \*Qchannel\*U. In the special case where the term \*Qaccess channel\*U 
is used to encompass 
bidirectional working through the user\(hynetwork interface, it must not be
abbreviated to channel.
.PP
\fINote\ 2\fR \ \(em\ The term \*Qaccess channel\*U may be qualified, for 
example 
by\ H, B\ or\ D in which case it is appropriate to abbreviate the term to
\*QH\(hychannel\*U, to \*QB\(hychannel\*U or to \*QD\(hychannel\*U.
.PP
\fINote\ 3\fR \ \(em\ Unless otherwise qualified, the access channel
characteristics at the user\(hynetwork interface are assumed to be bidirectional 
symmetric. When such characteristics are unidirectional, the term 
\*Qunidirectional access channel\*U should be used.
.RT
.sp 1P
.LP
415
	\fBinterface structure, ISDN user\(hynetwork interface structure\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIstructure d'interface, structure d'interface RNIS\fR 
\fIusager\(hyr\*'eseau\fR 
.LP
	\fIS:\fR 	\fIestructura de interfaz, estructura de interfaz\fR 
\fIusuario\(hyred de la RDSI\fR 
.PP
The number and type of the access channels that appear at an ISDN user\(hynetwork 
interface. 
.RT
.sp 1P
.LP
416
	\fBaccess capability, ISDN access capability\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIcapacit\*'e d'acc\*`es, capacit\*'e d'acc\*`es au RNIS\fR 
.LP
	\fIS:\fR 	\fIcapacidad de acceso, capacidad de acceso de la RDSI\fR 
.PP
The number and type of the access channels at an ISDN access
interface that are actually available for telecommunication purposes.
.RT
.sp 1P
.LP
417
	\fBterminal equipment\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fI\*'equipement terminal (ET)\fR 
.LP
	\fIS:\fR 	\fIequipo terminal\fR 
.PP
Equipment that provides the functions necessary for the operation of the 
access protocols by the user. 
.RT
.sp 1P
.LP
418
	\fBnetwork termination\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIterminaison de r\*'eseau\fR 
.LP
	\fIS:\fR 	\fIterminaci\*'on de red\fR 
.PP
Equipment that provides the functions necessary for the operation of the 
access protocols by the network. 
.PP
\fINote\fR \ \(em\ The network termination provides essential functions for
transmission purposes.
.RT
.sp 1P
.LP
419
	\fBfunctional group [functional grouping]\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIgroupe fonctionnel [groupement fonctionnel]\fR 
.LP
	\fIS:\fR 	\fIgrupo funcional [agrupaci\*'on funcional]\fR 
.PP
A set of functions that may be performed by a single
equipment.
.RT
.sp 1P
.LP
420
	\fBreference point\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIpoint de r\*'ef\*'erence\fR 
.LP
	\fIS:\fR 	\fIpunto de referencia\fR 
.PP
A conceptual point at the conjunction of two non\(hyoverlapping
functional groups.
.bp
.RT
.sp 1P
.LP
421
	\fBreference configuration\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIconfiguration de r\*'ef\*'erence\fR 
.LP
	\fIS:\fR 	\fIconfiguraci\*'on de referencia\fR 
.PP
A combination of functional groups and reference points that
shows possible network arrangements.
.RT
.sp 1P
.LP
422
	\fBmultipoint access\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIacc\*`es multipoint\fR 
.LP
	\fIS:\fR 	\fIacceso multipunto\fR 
.PP
User access in which more than one terminal equipment is supported by a 
single network termination. 
.RT
.sp 1P
.LP
423
	\fBaccess contention\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIconflit d'acc\*`es\fR 
.LP
	\fIS:\fR 	\fIcontienda de accesso\fR 
.PP
A conflict between the demands made on a network termination in
multipoint access.
.RT
.sp 1P
.LP
424
	\fBaccess contention resolution\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIr\*'esolution des conflits d'acc\*`es\fR 
.LP
	\fIS:\fR 	\fIresoluci\*'on de contienda de acceso\fR 
.PP
The arbitration of conflicting demands on a network termination in multipoint 
access. 
.RT
.sp 2P
.LP
2.5
	\fISignalling\fR 
.sp 1P
.RT
.sp 1P
.LP
501
	\fBsignalling\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIsignalisation\fR 
.LP
	\fIS:\fR 	\fIse\o"n~"alizaci\*'on\fR 
.PP
The exchange of information specifically concerned with the
establishment and control of connections, and with management, in a
telecommunication network.
.RT
.sp 1P
.LP
502
	\fBchannel\(hyassociated signalling\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIsignalisation voie par voie\fR 
.LP
	\fIS:\fR 	\fIse\o"n~"alizaci\*'on asociada al canal\fR 
.PP
A method of signalling in which signalling information relating to the 
traffic carried by a single channel is transmitted in the channel itself 
or in a signalling channel permanently associated with it. 
.RT
.sp 1P
.LP
503
	\fBcommon channel signalling\fR 
.sp 9p
.RT
.LP
	 \fIF:\fR \fIsignalisation sur voie commune, signalisation par canal\fR 
\fIs\*'emaphore\fR 
.LP
	\fIS:\fR 	\fIse\o"n~"alizaci\*'on por canal com\*'un\fR 
.PP
A method of signalling in which signalling information relating
to a multiplicity of circuits or functions or for network management, is
conveyed over a single channel by addressed messages.
.RT
.sp 1P
.LP
504
	\fBin\(hyslot signalling\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIsignalisation dans le cr\*'eneau temporel\fR 
.LP
	\fIS:\fR 	\fIse\o"n~"alizaci\*'on dentro del intervalo\fR 
.PP
Signalling associated with a channel and transmitted in a digit
time\(hyslot permanently (or periodically) allocated in the channel
time\(hyslot.
.bp
.RT
.sp 1P
.LP
505
	\fBout\(hyslot signalling\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIsignalisation hors cr\*'eneau temporel\fR 
.LP
	\fIS:\fR 	\fIse\o"n~"alizaci\*'on fuera del intervalo\fR 
.PP
Signalling associated with a channel and transmitted in one or
more separate digit time\(hyslots not within the channel time\(hyslot.
.RT
.sp 1P
.LP
506
	\fBspeech digit signalling\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIsignalisation par \*'el\*'ements num\*'eriques vocaux\fR 
.LP
	\fIS:\fR 	\fIse\o"n~"alizaci\*'on por d\*'igitos de conversaci\*'on\fR 
.PP
A type of channel\(hyassociated signalling in which digit time\(hyslots 
primarily used for the transmission of encoded speech are periodically 
used for signalling. 
.RT
.ce 1000
.sp 3
ANNEX\ A
.ce 0
.ce 1000
(to Recommendation I.112)
.sp 9p
.RT
.ce 0
.ce 1000
\fBAlphabetical list of terms contained in this Recommendation\fR 
.FS
The
number against a term indicates its location in the
vocabulary.
.FE
.sp 1P
.RT
.ce 0
.LP
.sp 2
416
	access capability
.LP
414
	access channel
.LP
423
	access contention
.LP
424
	access contention resolution
.LP
406
	access protocol
.LP
103
	analogue signal
.LP
202
	bearer service
.LP
108
	channel
.LP
502
	channel\(hyassociated signalling
.LP
111
	circuit
.LP
503
	common\(hychannel signalling
.LP
101
	communication
.LP
309
	connection
.LP
315
	connection attribute
.LP
317
	connection element
.LP
316
	connection type
.LP
205
	demand service
.LP
205
	demand telecommunication service
.LP
109
	digital channel
.LP
112
	digital circuit
.LP
310
	digital connection
.LP
116
	digital exchange
.LP
302
	digital link
.LP
306
	digital network
.LP
105
	digital signal
.LP
114
	digital switching
.LP
304
	digital switching node
.LP
112
	digital telecommunication circuit
.LP
107
	digital transmission
.LP
109
	digital transmission channel
.LP
302
	digital transmission link
.LP
104
	discretely\(hytimed signal
.LP
115
	exchange
.LP
313
	exchange connection
.LP
403
	function
.LP
419
	functional group
.LP
504
	in\(hyslot signalling
.LP
306
	integrated digital network
.LP
117
	integrated digital transmission and switching
.LP
308
	integrated services digital network (ISDN)
.LP
307
	integrated services network
.LP
408
	interface
.LP
412
	interface specification
.LP
415
	interface structure
.LP
416
	ISDN access capability
.LP
314
	ISDN connection
.LP
315
	ISDN connection attribute
.LP
317
	ISDN connection element
.LP
316
	ISDN connection type
.LP
415
	ISDN user\(hynetwork interface structure
.LP
404
	layer
.LP
410
	layer interface
.LP
.sp 3
.bp
.LP
301
	link
.LP
422
	multipoint access
.LP
305
	network
.LP
418
	network termination
.LP
303
	node
.LP
312
	non\(hyswitched connection
.LP
319
	non\(hyswitched connection element
.LP
319
	non\(hyswitched ISDN connection element
.LP
505
	out\(hyslot signalling
.LP
207
	permanent circuit service
.LP
207
	permanent circuit telecommunication service
.LP
411
	physical interface
.LP
413
	physical interface specification
.LP
321
	point\(hyto\(hymultipoint ISDN connection
.LP
320
	point\(hyto\(hypoint ISDN connection
.LP
405
	protocol
.LP
421
	reference configuration
.LP
420
	reference point
.LP
206
	reserved circuit service
.LP
206
	reserved circuit telecommunication service
.LP
201
	service
.LP
208
	service attribute
.LP
102
	signal
.LP
501
	signalling
.LP
506
	speech digit signalling
.LP
311
	switched connection
.LP
318
	switched connection element
.LP
318
	switched ISDN connection element
.LP
113
	switching
.LP
303
	switching node
.LP
204
	teleaction service
.LP
110
	telecommunication
.LP
111
	telecommunication circuit
.LP
305
	telecommunication network
.LP
201
	telecommunication service
.LP
208
	telecommunication service attribute
.LP
203
	teleservice
.LP
417
	terminal equipment
.LP
106
	transmission
.LP
108
	transmission channel
.LP
301
	transmission link
.LP
401
	user
.LP
402
	user access
.LP
402
	user\(hynetwork access
.LP
409
	user\(hynetwork interface
.LP
407
	user\(hyuser protocol
.LP
401
	user of a telecommunication network
.LP
.sp 2
.sp 2P
.LP
\fBRecommendation\ I.113\fR 
.RT
.sp 2P
.sp 1P
.ce 1000
\fBVOCABULARY\ OF\ TERMS\ FOR\ BROADBAND\ ASPECTS\ OF\ ISDN\fR 
.EF '%	Fascicle\ III.7\ \(em\ Rec.\ I.113''
.OF '''Fascicle\ III.7\ \(em\ Rec.\ I.113	%'
.ce 0
.sp 1P
.ce 1000
\fI(Melbourne, 1988)\fR 
.sp 9p
.RT
.ce 0
.sp 1P
.LP
\fB1\fR 	\fBIntroduction\fR 
.sp 1P
.RT
.PP
This Recommendation consists primarily of those terms and
definitions that are considered essential to the understanding and application 
of the principles of Broadband Aspects of Integrated Services Digital Network 
(B\(hyISDN). They are not exclusive to broadband aspects of ISDN and are 
recommended also for application, insofar as they are relevant, to other
types of telecommunication networks.
.PP
Included are terms that may already be defined in other CCITT/CCIR
Recommendations. However, the definitions given here embrace only the essential 
concepts and on that basis it is considered that they are not inconsistent 
with the more specialized definitions that appear in those Recommendations. 
.bp
.PP
According to the conventions applied in this Recommendation, any term in 
common usage, but whose use is deprecated, is shown in brackets as in the 
following example: \*Qbroadband [wideband]\*U.
.PP
Where a truncated term is widely used in an understood context the
complete term is quoted following the colloquial form, for example,
\*Qcontribution, contribution application\*U.
.PP
Some definitions include terms in bold face to indicate that these
terms are defined elsewhere in this Recommendation.
.PP
Annex A to this Recommendation contains an alphabetical list of all
the terms contained in this Recommendation.
.RT
.sp 2P
.LP
\fB2\fR 	\fBVocabulary of terms\fR 
.sp 1P
.RT
.PP
(This section is divided into two sub\(hysections, 2.1 Services, and 2.2 
Interfaces, channels and transfer modes. Within each sub\(hysection the 
terms are listed and defined.) 
.RT
.sp 2P
.LP
2.1
	\fIServices\fR 
.sp 1P
.RT
.sp 1P
.LP
101
	\fBbroadband [wideband]\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIlarge bande\fR 
.LP
	\fIS:\fR 	\fIbanda ancha\fR 
.PP
A service or system requiring transmission channels capable of
supporting rates greater than the primary rate.
.RT
.sp 1P
.LP
102
	\fBbroadcast\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIdiffusion\fR 
.LP
	\fIS:\fR 	\fIdifusi\*'on\fR 
.PP
A value of the service attribute \*Qcommunication configuration\*U,
which denotes unidirectional distribution to all subscribers.
.PP
\fINote\fR \ \(em\ This term should not be confused with the term \*Qbroadcasting 
service\*U as defined in the ITU Radio Regulations. 
.RT
.sp 1P
.LP
103
	\fBconnectionless service\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIservice sans connexion\fR 
.LP
	\fIS:\fR 	\fIservicio sin conexi\*'on\fR 
.PP
A service which allows the transfer of information among service subscribers 
without the need for end\(hyto\(hyend call establishment procedures. 
.PP
\fINote\fR \ \(em\ Connectionless services may be used to support both
interactive and distribution services.
.RT
.sp 1P
.LP
104
	\fBcontribution, contribution application\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIcontribution\fR 
.LP
	\fIS:\fR 	\fIcontribuci\*'on, aplicaci\*'on de contribuci\*'on\fR 
.PP
Use of a \fBbroadband\fR service or channel for transferring audio or video 
information to user for further \fBpost\(hyproduction processing\fR and 
subsequent \fBdistribution\fR .
.RT
.sp 1P
.LP
105
	\fBconversational service\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIservice conversationnel\fR 
.LP
	\fIS:\fR 	\fIservicio conversacional\fR 
.PP
An \fBinteractive service\fR which provides for bidirectional
communication by means of real\(hytime (no store\(hyand\(hyforward) end\(hyto\(hyend 
information transfer from user to user or between user and host.
.bp
.RT
.sp 1P
.LP
106
	\fBdistribution, distribution aplication\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIdistribution\fR 
.LP
	\fIS:\fR 	\fIdisribuci\*'on, aplicaci\*'on de distribuci\*'on\fR 
.PP
Use of a \fBbroadband\fR service or channel for transferring audio or video 
information to a user or a number of users which will not apply 
\fBpost\(hyproduction processing\fR to the information.
.RT
.sp 1P
.LP
107
	\fBdistribution service\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIservice de distribution\fR 
.LP
	\fIS:\fR 	\fIservicio de distribuci\*'on\fR 
.PP
Service characterized by the unidirectional flow of information
from a given point in the network to other (multiple) locations. Distribution 
services are subdivided into two classes: \fBdistribution services without 
user\fR \fBindividual presentation control\fR and \fBdistribution services 
with user\fR 
\fBindividual presentation control\fR .
.RT
.sp 1P
.LP
108
	\fBdistribution service with user individual presentation control\fR 
.sp 9p
.RT
.LP
	 \fIF:\fR \fIservice distribu\*'e avec contr\* | le de pr\*'esentation 
par l'usager\fR 
.LP
	 \fIS:\fR \fIservicio de distribuci\*'on con control de la presentaci\*'on 
por el\fR \fIusuario\fR 
.PP
A \fBdistribution service\fR in which the information is provided as a 
sequence of information entities (e.g.,\ frames) with cyclical repetition, 
so 
that the user has the ability to select individual information entities 
and can control the start and order of the information. 
.RT
.sp 1P
.LP
109
	\fBdistribution service without user individual presentation\fR 
\fBcontrol\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIservice distribu\*'e sans contr\* | le de pr\*'esentation par\fR 
\fIl'usager\fR 
.LP
	 \fIS:\fR \fIservicio de distribuci\*'on sin control de la presentaci\*'on\fR 
\fIpor el usuario\fR 
.PP
A \fBdistribution service\fR which users can access without having any 
control over the start and order of the presentation of the distributed 
information.
.RT
.sp 1P
.LP
110
	\fBenhanced\(hyquality television\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIt\*'el\*'evision de qualit\*'e am\*'elior\*'ee\fR 
.LP
	\fIS:\fR 	\fItelevisi\*'on de calidad mejorada\fR 
.PP
Television of quality superior to \fBexisting\(hyquality television\fR 
, but less than the quality of high\(hydefinition television. 
.RT
.sp 1P
.LP
111
	\fBexisting\(hyquality television\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIt\*'el\*'evision de qualit\*'e conventionnelle\fR 
.LP
	\fIS:\fR 	\fItelevisi\*'on de calidad convencional\fR 
.PP
Television as defined in conventional 625\(hyline and 525\(hyline
television standards, such as NTSC, PAL and SECAM.
.RT
.sp 1P
.LP
112
	\fBinteractive service\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIservice interactif\fR 
.LP
	\fIS:\fR 	\fIservicio interactivo\fR 
.PP
A service which provides the means for bidirectional exchange of information 
between users or between users and hosts. Interactive services are subdivided 
into three classes of services: \fBconversational services, messaging\fR 
\fBservices\fR and \fBretrieval services\fR . 
.RT
.sp 1P
.LP
113
	\fBmessaging service\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIservice de messagerie\fR 
.LP
	\fIS:\fR 	\fIservicio de mensajer\*'ia\fR 
.PP
An \fBinteractive service\fR which offers user\(hyto\(hyuser communication 
between individual users via storage units with store\(hyand\(hyforward, 
mailbox 
and/or message handling (e.g.\ information editing, processing and conversion) 
functions. 
.bp
.RT
.sp 1P
.LP
114
	\fBmixed document\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIdocument mixte\fR 
.LP
	\fIS:\fR 	\fIdocumento mixto\fR 
.PP
A document that may contain text, graphics, data, image, and
moving picture information as well as voice annotation.
.RT
.sp 1P
.LP
115
	\fBmultipoint\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fImultipoint\fR 
.LP
	\fIS:\fR 	\fImultipunto\fR 
.PP
A value of the attribute \*Qcommunication configuration\*U which
denotes that the communication involves more than two network
terminations.
.RT
.sp 1P
.LP
116
	\fBpost\(hyproduction processing\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIpost\(hyproduction (traitment apr\*`es production)\fR 
.LP
	\fIS:\fR 	\fItratamiento de posproducci\*'on\fR 
.PP
Further processing of contributed audio and video information, to change 
the form or presentation of the information prior to its final 
utilization.
.RT
.sp 1P
.LP
117
	\fBretrieval service\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIservice de consultation\fR 
.LP
	\fIS:\fR 	\fIservicio de consulta\fR 
.PP
An \fBinteractive service\fR which provides the capability of
accessing information stored in database centres. This information will 
be sent to the user on demand only. The information can be retrieved on 
an individual basis, i.e.,\ the time at which an information sequence is 
to start is under the control of the user. 
.RT
.sp 1P
.LP
118
	\fBsound retrieval service\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIservice de consultation de programmes sonores\fR 
.LP
	\fIS:\fR 	\fIservicio de consulta de programas sonoros\fR 
.PP
On\(hydemand (user initiated) retrieval of music and other audio
information.
.RT
.sp 1P
.LP
119
	\fBvideomessaging\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fImessagerie vid\*'eo\fR 
.LP
	\fIS:\fR 	\fIvideomensajer\*'ia\fR 
.PP
A \fBmessaging service\fR for the transfer for moving pictures.
.RT
.sp 2P
.LP
2.2
	\fIInterfaces, channels and transfer modes\fR 
.sp 1P
.RT
.sp 1P
.LP
201
	\fBasynchronous time\(hydivision multiplexing\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fImultiplexage temporel asynchrone\fR 
.LP
	\fIS:\fR 	\fImultiplexaci\*'on as\*'incrona por divisi\*'on en el tiempo\fR 
.PP
A multiplexing technique in which a transmission capability is
organized in undedicated slots filled with \fBcells\fR with respect to each
application's instantaneous real need. In this case, the terminal equipment
\(em\ i.e.\ the customer application\ \(em defines the actual transmitted 
bit rate, 
whatever this rate is, possibly variable during the communication. This
technique carries a \fBlabelled interface structure\fR over a \fBframe\fR or a
\fBself\(hydelineating labelled interface\fR .
.bp
.RT
.sp 1P
.LP
202
	\fBasynchronous transfer mode (ATM)\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fImode de transfert asynchrone (MTA)\fR 
.LP
	\fIS:\fR 	\fImodo de transferencia as\*'incrono (MTA)\fR 
.PP
A \fBtransfer mode\fR in which the information is organized into
\fBcells\fR ; it is asynchronous in the sense that the recurrence of cells 
depends on the required or instantaneous bit rate. \fBStatistical\fR and 
\fBdeterministic\fR values may also be used to qualify the \fBtransfer 
mode\fR . 
.RT
.sp 1P
.LP
203
	\fBblock\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIbloc\fR 
.LP
	\fIS:\fR 	\fIbloque\fR 
.PP
A unit of information consisting of a \fBheader\fR and an information  field.
.RT
.sp 1P
.LP
204
	\fBblock payload\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIcharge utile de bloc\fR 
.LP
	\fIS:\fR 	\fIcarga neta del bloque\fR 
.PP
The user information bits within a \fBblock\fR .
.RT
.sp 1P
.LP
205
	\fBbroadband access\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIacc\*`es \*`a large bande\fR 
.LP
	\fIS:\fR 	\fIacceso de banda ancha\fR 
.PP
An ISDN access able to contain at least one channel capable of
supporting a rate greater than the primary rate, or supporting an equivalent
information transfer rate.
.RT
.sp 1P
.LP
206
	\fBbroadband communication channel\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIvoie de communication \*`a large bande\fR 
.LP
	\fIS:\fR 	\fIcanal de comunicaci\*'on de banda ancha\fR 
.PP
A standard portion of the \fBinformation payload capacity\fR ,
available to the user for ISDN services. A \fBbroadband\fR communication 
channel 
exists only during a call, as set\(hyup by a signalling or administrative
procedure. The \fBthroughput\fR supported by the broadband communication 
channel 
may be \fBdeterministic\fR or \fBstatistical\fR .
.RT
.sp 1P
.LP
207
	\fBcell\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIcellule\fR 
.LP
	\fIS:\fR 	\fIc\*'elula\fR 
.PP
A \fBblock\fR of fixed length identified by a label at layer 1 of the OSI 
reference model. 
.RT
.sp 1P
.LP
208
	\fBcircuit transfer mode\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fImode de transfert par circuit\fR 
.LP
	 \fIS:\fR \fImodo de transferencia circuito, modo de transferencia\fR 
\fIpor circuito\fR 
.PP
A \fBtransfer mode\fR in which transmission and switching functions
are achieved by permanent allocation of channels/bandwidth between the
connections.
.RT
.sp 1P
.LP
209
	\fBdeterministic, ATM deterministic transfer mode\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fImode de transfert asynchrone d\*'eterministe\fR 
.LP
	 \fIS:\fR \fIdetermin\*'istico, modo de transferencia determin\*'istico 
MTA\fR 
.PP
A specific \fBtransfer mode\fR of the \fBasynchronous transfer mode\fR 
(ATM) in which the maximum information transfer capacity specified for 
a given service is provided to the user throughout a call. 
.bp
.RT
.sp 1P
.LP
210
	\fBframe\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fItrame\fR 
.LP
	\fIS:\fR 	\fItrama\fR 
.PP
A \fBblock\fR of variable length identified by a label at layer 2 of the 
OSI reference model, e.g.\ an HDLC block. 
.RT
.sp 1P
.LP
211
	\fBframed interface\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIinterface tram\*'ee\fR 
.LP
	\fIS:\fR 	\fIinterfaz entramado\fR 
.PP
An interface whose serial bit stream is segmented into \fBperiodic\fR \fBphysical 
frames\fR . Each frame is divided by a fixed partition into an overhead 
and an \fBinformation payload\fR portion. 
.RT
.sp 1P
.LP
212
	\fBheader, block header\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIen\(hyt\* | te de bloc\fR 
.LP
	\fIS:\fR 	\fIencabezamiento, encabezamiento de bloque\fR 
.PP
The bits within a \fBblock\fR allocated for \fBlabelled multiplexing\fR 
functions. 
.RT
.sp 1P
.LP
213
	\fBhybrid interface structure\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIstructure d'interface hybride\fR 
.LP
	\fIS:\fR 	\fIestructure h\*'ibrida de interfaz\fR 
.PP
An interface structure which has a mixture of \fBlabelled channels\fR and 
\fBpositioned channels\fR . 
.RT
.sp 1P
.LP
214
	\fBinformation payload capacity\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIcapacit\*'e utile d'information\fR 
.LP
	\fIS:\fR 	\fIcapacidad de carga neta de informaci\*'on\fR 
.PP
The \fBinterface rate\fR minus the overhead. The bit rate of the
\fBinterface payload\fR .
.RT
.sp 1P
.LP
215
	\fBinterface overhead\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIcharge suppl\*'ementaire d'interface\fR 
.LP
	\fIS:\fR 	\fItara del interfaz\fR 
.PP
The remaining portion of the bit stream after deducting the
\fBinformation payload\fR . The interface overhead may be essential (e.g.\ 
framing 
for an interface shared by users) or ancillary (e.g.\ performance
monitoring).
.RT
.sp 1P
.LP
216
	\fBinterface payload\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIcharge utile d'interface\fR 
.LP
	\fIS:\fR 	\fIcarga neta del interfaz\fR 
.PP
The portion of the bit stream of a \fBframed interface\fR which can be 
used for telecommunication services. Any signalling is included in the 
\fBinterface payload\fR .
.RT
.sp 1P
.LP
217
	\fBinterface rate, interface bit rate\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fId\*'ebit (binaire) de l'interface\fR 
.LP
	\fIS:\fR 	\fIvelocidad del interfaz, velocidad binaria del interfaz\fR 
.PP
The gross bit rate at the interface, e.g. the bit rate at the
boundary between the physical layer and the physical medium.
.bp
.RT
.sp 1P
.LP
218
	\fBlabelled channel\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIvoie \*'etiquet\*'ee\fR 
.LP
	\fIS:\fR 	\fIcanal etiquetado\fR 
.PP
A temporally\(hyordered collection of all \fBblock payloads\fR having a 
common label value. 
.RT
.sp 1P
.LP
219
	\fBlabelled deterministic channel\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIvoie \*'etiquet\*'ee d\*'eterministe\fR 
.LP
	\fIS:\fR 	\fIcanal etiquetado determin\*'istico\fR 
.PP
A \fBlabelled channel\fR that, in each successive interval of
specified constant duration, contains on the average a constant number of
\fBblocks\fR .
.RT
.sp 1P
.LP
220
	\fBlabelled interface structure\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIstructure d'interface \*'etiquet\*'ee\fR 
.LP
	\fIS:\fR 	\fIestructura de interfaz etiquetado\fR 
.PP
An interface structure in which all services and signalling are
provided by \fBlabelled channels\fR . A labelled interface structure can be
accommodated within a \fBframed interface\fR or a \fBself\(hydelineating 
labelled\fR 
\fBinterface\fR .
.RT
.sp 1P
.LP
221
	\fBlabelled multiplexing\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fImultiplexage par \*'etiquetage\fR 
.LP
	\fIS:\fR 	\fImultiplexaci\*'on por etiquetado\fR 
.PP
The multiplexing of \fBlabelled channels\fR by concatenating the
\fBblocks\fR of the different channels.
.RT
.sp 1P
.LP
222
	\fBlabelled statistical channel\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIvoie \*'etiquet\*'ee statistique\fR 
.LP
	\fIS:\fR 	\fIcanal etiquetado estad\*'istico\fR 
.PP
A \fBlabelled channel\fR in which the payload of the successive
\fBblocks\fR of the channel is random and/or the block durations are random.
.RT
.sp 1P
.LP
223
	\fBlogical signalling channel\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIvoie logique de signalisation\fR 
.LP
	\fIS:\fR 	\fIcanal l\*'ogico de se\o"n~"alizaci\*'on\fR 
.PP
A logical channel for signalling information with a defined
maximum capacity, which is contained within an information channel or a
\fBphysical signalling channel\fR .
.RT
.sp 1P
.LP
224
	\fBnetwork node interface (NNI)\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIinterface de noeud du r\*'eseau (INR)\fR 
.LP
	\fIS:\fR 	\fIinterfaz de nodo de red (INR)\fR 
.PP
The interface between two network nodes (e.g. synchronous digital multiplex 
equipments, digital exchanges). 
.RT
.sp 1P
.LP
225
	\fBpacket\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIpaquet\fR 
.LP
	\fIS:\fR 	\fIpaquete\fR 
.PP
An information \fBblock\fR identified by a label at layer 3 of the OSI 
reference model. 
.bp
.RT
.sp 1P
.LP
226
	\fBpacket transfer mode\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fImode de transfert par paquet\fR 
.LP
	 \fIS:\fR \fImodo de transferencia paquete, modo de transferencia por\fR 
\fIpaquete\fR 
.PP
A \fBtransfer mode\fR in which the transmission and switching
functions are achieved by \fBpacket\fR oriented techniques, so as to dynamically 
share network transmission and switching resources between a multiplicity of
connections.
.RT
.sp 1P
.LP
227
	\fBpayload module\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fImodule de charge utile\fR 
.LP
	 \fIS:\fR \fIm\*'odulo de carga neta, m\*'odulo de carga \*'util, m\*'odulo\fR 
\fIneto\fR 
.PP
That portion of the \fBinformation payload\fR within which one or more 
channels entirely exist. 
.RT
.sp 1P
.LP
228
	\fBperiodic frame\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fItrame p\*'eriodique\fR 
.LP
	\fIS:\fR 	\fItrama peri\*'odica\fR 
.PP
A transmission segment which is repeated at intervals of equal
duration (e.g.\ 125\ \(*msec), and may be delineated by incorporating fixed 
periodic patterns into the bit stream. 
.RT
.sp 1P
.LP
229
	\fBphysical frame\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fItrame physique\fR 
.LP
	\fIS:\fR 	\fItrama f\*'isica\fR 
.PP
A segment of a serial logical bit stream at an interface,
partitioned into successive segments.
.RT
.sp 1P
.LP
230
	\fBphysical signalling channel\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIvoie physique de signalisation\fR 
.LP
	\fIS:\fR 	\fIcanal f\*'isico de se\o"n~"alizaci\*'on\fR 
.PP
A dedicated physical channel (e.g. D\(hychannel) used for signalling information. 
It may be used to carry other information. 
.RT
.sp 1P
.LP
231
	\fBpositioned channel\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIvoie identifi\*'ee par sa position\fR 
.LP
	\fIS:\fR 	\fIcanal posicionado, canal localizado\fR 
.PP
A channel that occupies bit positions which form a fixed periodic pattern 
(e.g.\ B, H and D\(hychannels in ISDN user interfaces). 
.RT
.sp 1P
.LP
232
	\fBpositioned interface structure\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIstructure d'interface positionn\*'ee\fR 
.LP
	\fIS:\fR 	\fIestructura de interfaz posicionado\fR 
.PP
A structure in which all services and signalling are provided by \fBpositioned 
channels\fR . Such a structure can exist only within a \fBframed\fR 
\fBinterface\fR .
.RT
.sp 1P
.LP
233
	\fBself\(hydelineating block\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIbloc \*`a auto\(hycadrage\fR 
.LP
	\fIS:\fR 	\fIbloque autodelimitado\fR 
.PP
A \fBblock\fR with the property that its endpoints can be identified by 
examining the block itself. A defined pattern or flag at the beginning 
of 
each block might serve to demarcate the block.
.bp
.RT
.sp 1P
.LP
234
	\fBself\(hydelineating labelled interface\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIinterface \*'etiquet\*'ee \*`a auto\(hycadrage\fR 
.LP
	\fIS:\fR 	\fIinterfaz etiquetado autodelimitado\fR 
.PP
An interface whose entire serial bit stream consists of a
self\(hydelineating \fBlabelled multiplexing\fR .
.RT
.sp 1P
.LP
235
	\fBstatistical, ATM statistical transfer mode\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIstatistique, mode de transfert asynchrone statistique\fR 
.LP
	\fIS:\fR 	\fIestad\*'istico, modo de transferencia estad\*'istico MTA\fR 
.PP
A specific transfer mode of the \fBasynchronous transfer mode\fR 
(ATM) in which the average information transfer capacity specified for 
a given service is provided to the user throughout a call. 
.RT
.sp 1P
.LP
236
	\fBsynchronous time division multiplexing\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fImultiplexage temporel synchrone\fR 
.LP
	\fIS:\fR 	\fImultiplexaci\*'on s\*'incrona por division en el tiempo\fR 
.PP
A multiplexing technique supporting \fBthe synchronous transfer\fR 
\fBmode\fR (STM).
.RT
.sp 1P
.LP
237
	\fBsynchronous transfer mode (STM)\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fImode de transfert (temporel) synchrone (MTS)\fR 
.LP
	\fIS:\fR 	\fImodo de transferencia s\*'incrono (MTS)\fR 
.PP
A \fBtransfer mode\fR which offers periodically to each connection a fixed\(hylength 
word. 
.RT
.sp 1P
.LP
238
	\fBthroughput\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIcapacit\*'e utile\fR 
.LP
	\fIS:\fR 	\fIcaudal de tr\*'afico, caudal\fR 
.PP
The number of data bits contained in a \fBblock\fR (e.g. between the address 
field and the CRC field of the LAPD\(hybased frames) successfully 
transferred in one direction across a section per unit time.
.RT
.sp 1P
.LP
239
	\fBtransfer mode\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fImode de transfert\fR 
.LP
	\fIS:\fR 	\fImodo de transferencia\fR 
.PP
Aspects covering transmission, multiplexing and switching in a
telecommunications network.
.RT
.sp 1P
.LP
240
	\fBtransit delay\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fId\*'elai de transfert\fR 
.LP
	\fIS:\fR 	\fIretardo de tr\*'ansito\fR 
.PP
The time difference between the instant at which the first bit of the address 
field of a frame crosses one designated boundary, and the instant at which 
the last bit of the closing flag of the frame crosses a second 
designated boundary.
.RT
.sp 1P
.LP
241
	\fBvirtual circuit\fR 
.sp 9p
.RT
.LP
	\fIF:\fR 	\fIcircuit virtuel\fR 
.LP
	\fIS:\fR 	\fIcircuito virtual\fR 
.PP
A type of \fBasynchronous transfer mode\fR (ATM) connection involving establishment 
and release procedures such that the label associated with each \fBcell\fR 
need not contain complete routing information. 
.bp
.RT
.ce 1000
ANNEX\ A
.ce 0
.ce 1000
(to Recommendation I.113)
.sp 9p
.RT
.ce 0
.ce 1000
\fBAlphabetical list of terms\fR 
.sp 1P
.RT
.ce 0
.ce 1000
\fBcontained in this Recommendation\fR 
.FS
The number
against a term indicates its location in the vocabulary.
.FE
.ce 0
.LP
.sp 4
201
	asynchronous time\(hydivision multiplexing
.LP
202
	asynchronous transfer mode
.LP
202
	ATM
.LP
209
	ATM deterministic transfer mode
.LP
235
	ATM statistical transfer mode
.LP
203
	block
.LP
212
	block header
.LP
204
	block payload
.LP
101
	broadband
.LP
205
	broadband access
.LP
206
	broadband communication channel
.LP
102
	broadcast
.LP
207
	cell
.LP
208
	circuit transfer mode
.LP
103
	connectionless service
.LP
104
	contribution
.LP
104
	contribution application
.LP
105
	conversational service
.LP
209
	deterministic
.LP
106
	distribution
.LP
106
	distribution application
.LP
107
	distribution service
.LP
108
	distribution service with user individual presentation control
.LP
109
	distribution service without user individual presentation control
.LP
110
	enhanced\(hyquality television
.LP
111
	existing\(hyquality television
.LP
210
	frame
.LP
211
	frame interface
.LP
212
	header
.LP
213
	hybrid interface structure
.LP
214
	information payload capacity
.LP
112
	interactive service
.LP
217
	interface bit rate
.LP
215
	interface overhead
.LP
216
	interface payload
.LP
217
	interface rate
.LP
218
	labelled channel
.LP
219
	labelled deterministic channel
.LP
220
	labelled interface structure
.LP
221
	labelled multiplexing
.LP
222
	labelled statistical channel
.LP
223
	logical signalling channel
.LP
113
	messaging service
.LP
114
	mixed document
.LP
115
	multipoint
.LP
224
	network node interface
.LP
224
	NNI
.LP
225
	packet
.LP
226
	packet transfer mode
.LP
227
	payload module
.LP
228
	periodic frame
.LP
229
	physical frame
.LP
230
	physical signalling channel
.LP
231
	positioned channel
.LP
232
	positioned interface structure
.LP
116
	post\(hyproduction processing
.LP
117
	retrieval service
.LP
233
	self\(hydelineating block
.LP
234
	self\(hydelineating labelled interface
.LP
118
	sound retrieval service
.LP
235
	statistical
.LP
237
	STM
.LP
236
	synchronous time division multiplexing
.LP
237
	synchronous transfer mode
.LP
238
	throughput
.LP
239
	transfer mode
.LP
240
	transit delay
.LP
119
	videomessaging
.LP
241
	virtual circuit
.LP
101
	wideband (deprecated)
.LP
.rs
.sp 2P
.ad r
Blanc
.ad b
.RT
.LP
.bp