.rs
.\" Troff code generated by TPS Convert from ITU Original Files
.\"                 Not Copyright ( c) 1991 
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.\" Assumes tbl, eqn, MS macros, and lots of luck.
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.EN
.nr LL 40.5P
.nr ll 40.5P
.nr HM 3P
.nr FM 6P
.nr PO 4P
.nr PD 9p
.po 4P

.rs
\v | 5i'
.LP
\s9\fBMONTAGE:\ \fBREC.\ G.652 AU DEBUT DE CETTE PAGE\fR 
.RT
.sp 2P
.LP
\v'27P'
\fBRecommendation G.653\fR 
.RT
.sp 2P
.ce 1000
\fBCHARACTERISTICS OF A DISPERSION\(hySHIFTED SINGLE\(hyMODE\fR 
.EF '%	Fascicle\ III.3\ \(em\ Rec.\ G.653''
.OF '''Fascicle\ III.3\ \(em\ Rec.\ G.653	%'
.ce 0
.sp 1P
.ce 1000
\fBOPTICAL FIBRE CABLE\fR 
.ce 0
.sp 1P
.ce 1000
\fI(Melbourne, 1988)\fR 
.sp 9p
.RT
.ce 0
.sp 1P
.LP
	The CCITT,
.sp 1P
.RT
.sp 1P
.LP
\fIconsidering\fR 
.sp 9p
.RT
.PP
(a)
that dispersion\(hyshifted optical fibre cables are going to be used widely 
in telecommunication networks; 
.PP
(b)
that the foreseen potential applications may require
several kinds of single\(hymode fibres differing in operation wavelength
geometrical and optical characteristics, and attenuation dispersion and 
other transmission characteristics, 
.sp 1P
.LP
\fIrecommends\fR 
.sp 9p
.RT
.PP
a dispersion\(hyshifted single\(hymode fibre which has the
zero\(hydispersion wavelength in the 1550 nm wavelength region and which is
optimized for use at wavelengths around 1550 nm. This fibre may also be 
used at around 1300 nm subject to the constraints which are outlined in 
this 
Recommendation.
.bp
.PP
Its geometrical, optical and transmission parameters are described below.
.PP
The meaning of the terms used in this Recommendation are given in
Annex\ A to Recommendation G.652 and the guidelines to be followed in the
measurements to verify the various characteristics are indicated in Annex\ B
to Recommendation G.652. The characteristics of this fibre and the relevant
values will be refined as studies and experience progress.
.RT
.sp 2P
.LP
\fB1\fR 	\fBFibre characteristics\fR 
.sp 1P
.RT
.PP
Only those characteristics of the fibre providing a minimum
essential design framework for fibre manufacture are recommended in \(sc 1. Of
these, the cabled fibre cut\(hyoff wavelength may be significantly affected by
cable manufacture or installation. Otherwise, the recommended characteristics 
will apply equally to individual fibres, fibres incorporated into a cable 
wound on a drum, and fibres in an installed cable. 
.PP
This Recommendation applies to fibres having a nominally circular mode field.
.RT
.sp 1P
.LP
1.1
	\fIMode field diameter\fR 
.sp 9p
.RT
.PP
The nominal value of the mode field diameter at 1550 nm shall lie within 
the range of 7.0 to 8.3 \(*mm. The mode field diameter deviation should 
not exceed the limits of \(+- | 0% of the nominal value. 
.PP
\fINote\ 1\fR \ \(em\ The choice of a specific value within the above range is
not necessarily associated with a specific fibre design.
.PP
\fINote\ 2\fR \ \(em\ It should be noted that the fibre performance required 
for any given application is a function of essential fibre and systems 
parameters, i.e., mode field diameters, cut\(hyoff wavelength, chromatic 
dispersion, system 
operating wavelength, and bit rateB/Ffrequency of operation, and not primarily 
of the fibre design. 
.PP
\fINote\ 3\fR \ \(em\ All the above needs further study.
.RT
.sp 1P
.LP
1.2
	\fICladding diameter\fR 
.sp 9p
.RT
.PP
The recommended nominal value of the cladding diameter is\ 125\ \(*mm. 
The cladding deviation should not exceed the limits of\ \(+-\ 2.4% (\(+-\ 
3\ \(*mm). 
.PP
For some particular jointing techniques and joint loss requirements, other 
tolerances may be appropriate. 
.RT
.sp 1P
.LP
1.3
	\fIMode field concentricity error\fR 
.sp 9p
.RT
.PP
The recommended mode field concentricity error at\ 1550\ nm should
not exceed\ 1\ \(*mm.
.PP
\fINote\fR \ \(em\ For some particular jointing techniques and joint loss
requirements, tolerances up to\ 3\ \(*mm may be approrpriate.
.RT
.sp 2P
.LP
1.4
	\fINon\(hycircularity\fR 
.sp 1P
.RT
.sp 1P
.LP
1.4.1
	\fIMode field non\(hycircularity\fR 
.sp 9p
.RT
.PP
In practice, the mode field non\(hycircularity of fibres having
nominally circular mode fields is found to be sufficiently low that propagation 
and jointing are not affected. It is therefore not considered necessary 
to 
recommend a particular value for the mode field non\(hycircularity. It is not
normally necessary to measure the mode field non\(hycircularity for
acceptance purposes.
.RT
.sp 1P
.LP
1.4.2
	\fICladding non\(hycircularity\fR 
.sp 9p
.RT
.PP
The cladding non\(hycircularity should be less than\ 2%. For some
particular jointing techniques and joint loss requirements, other tolerances
may be appropriate.
.RT
.sp 1P
.LP
1.5
	\fICut\(hyoff wavelength\fR 
.sp 9p
.RT
.PP
Under study.
.RT
.sp 1P
.LP
1.6
	\fI1550\ nm bend performance\fR 
.sp 9p
.RT
.PP
The loss increase for 100 turns of fibre, loosely wound with
a\ 37.5\ mm radius and measured at 1550\ nm, shall be less than\ 0.5\ dB.
.bp
.PP
\fINote\ 1\fR \ \(em\ A qualification test may be sufficient to ensure 
that this requirement is being met. 
.PP
\fINote\ 2\fR \ \(em\ The above value of 100\ turns corresponds to the 
approximate number of turns deployed in all splice cases of typical repeater 
span. The 
radius of 37.5\ mm is equivalent to the minimum bend\(hyradius widely accepted 
for long\(hyterm deployment of fibres in practical systems installations 
to avoid 
static\(hyfatigue failure.
.PP
\fINote\ 3\fR \ \(em\ If for pratical reasons fewer than\ 100 turns are 
chosen to implement this test, it is suggested that not less than\ 40 turns, 
and a 
proportionately smaller loss increase be used.
.PP
\fINote\ 4\fR \ \(em\ If bending radii smaller than\ 37.5\ mm are planned to be
used in splice cases or elsewhere in the system (for example, R\ =\ 30\ 
mm) it is suggested that the same loss value of\ 0.5\ dB shall apply to 
100 turns of fibre deployed with this smaller radius. 
.PP
\fINote\ 5\fR \ \(em\ The 1550\ nm bend\(hyloss recommendation relates to the
deployment of fibres in practical single\(hymode fibre installations. The
influence of the stranding\(hyrelated bending radii of cabled single\(hymode 
fibres on the loss performance is included in the loss specification of 
the cabled 
fibre.
.PP
\fINote\ 6\fR \ \(em\ In the event that routine tests are required, a small
diameter loop with one or several turns can be used instead of the 100\(hyturn
test, for accuracy and measurement ease of the 1550\ nm bend sensitivity. In
this case, the loop diameter, number of turns, and the maximum permissible 
bend loss for the several\(hyturn test, should be chosen, so as to correlate 
with the 0.5\ dB loss recommendation of the\ 37.5\ mm radius 100\ turn 
functional test. 
.RT
.sp 2P
.LP
1.7
	\fIMaterial properties of the fibre\fR 
.sp 1P
.RT
.sp 1P
.LP
1.7.1
	\fIFibre materials\fR 
.sp 9p
.RT
.PP
The substances of which the fibres are made should be indicated.
.PP
\fINote\fR \ \(em\ Care may be needed in fusion splicing fibres of different
substances. Provisional results indicate that adequate splice loss and 
strength can be achieved when splicing different high\(hysilica fibres. 
.RT
.sp 1P
.LP
1.7.2
	\fIProtective materials\fR 
.sp 9p
.RT
.PP
The physical and chemical properties of the material used for the fibre 
primary coating, and the best way of removing it (if necessary) should 
be indicated. In the case of a single jacketed fibre similar indications 
shall be given. 
.RT
.sp 1P
.LP
1.8
	\fIRefractive index profile\fR 
.sp 9p
.RT
.PP
The refractive index profile of the fibre does not generally need to be 
known: if one wishes to measure it, the Reference Test Method in 
Recommendation\ G.651 may be used.
.RT
.sp 2P
.LP
\fB2\fR 	\fBFactory length specifications\fR 
.sp 1P
.RT
.PP
Since the geometrical and optical characteristics of fibres given in\ \(sc\ 
1 are barely affected by the cabling process, \(sc\ 2 will give 
recommendations mainly relevant to transmission characteristics of cabled
factory lengths.
.PP
Environmental and test conditions are paramount and are described in the 
guidelines for Test Methods. 
.RT
.sp 1P
.LP
2.1
	\fIAttenuation coefficient\fR 
.sp 9p
.RT
.PP
Optical fibre cables covered by this Recommendation generally have attenuation 
coefficients in the\ 1550\ nm region below\ 0.5\ dB/km. When they are intended 
for use in the 1300\ nm region, their attenuation coefficient in that region 
is genrally below\ 1\ dB/km. 
.PP
\fINote\fR \ \(em\ The lowest values depend on the fabrication process, fibre
composition and design, and cable design. Values in the rage 0.19\(hy0.25\ 
dB/km in the 1550\ nm region have been achieved. 
.bp
.RT
.sp 1P
.LP
2.2
	\fIChromatic dispersion coefficient\fR 
.sp 9p
.RT
.PP
Under study.
.PP
\fINote\ 1\fR \ \(em\ The maximum chromatic dispersion coefficient of single\(hymode 
fibres covered in this Recommendation shall be: 
.RT
.ce
\fBH.T. [T1.653]\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
cw(60p) | cw(72p) .
Wavelength  (nm)	 {
Maximum chromatic
dispersion coefficient
[ps/(nm\(mukm)]
 }
_
.T&
cw(60p) | cw(72p) .
1525\(hy1575	3.5
.T&
cw(60p) | cw(72p) .
1300 nm  region	Under study
_
.TE
.nr PS 9
.RT
.ad r
\fBTable [T1.653], p.  \fR 
.sp 1P
.RT
.ad b
.RT
.PP
\fINote\ 2\fR \ \(em\ The value of 3.5\ ps/(nm | (mu | m) allows for attenuation 
limited section lengths at 560 MbitB/Fs, using suitable multi\(hylongitudinal 
mode lasers and adequate line coding. 
.PP
\fINote\ 3\fR \ \(em\ For higher capacity (larger than 560 MbitB/Fs) or longer
length systems, operation closer to the zero\(hydispersion wavelength is 
required (unless single\(hylongitudinal mode laser diodes are used). Additional 
fibre 
parameters may then have to be specified (such as zero\(hydispersion wavelength, 
dispersion\(hyslope, etc.). Further studies are needed to identify these 
parameters.
.PP
\fINote\ 4\fR \ \(em\ It is not necessary to measure the chromatic dispersion
coefficient on a routine basis.
.RT
.sp 2P
.LP
\fB3\fR 	\fBElementary cable sections\fR 
.sp 1P
.RT
.PP
An elementary cable section usually includes a number of spliced
factory lengths. The requirements for factory lengths are given in\ \(sc\ 
2 of this Recommendation. The transmission parameters for elementary cable 
section must take into account not only the performance of the individual 
cable lengths but also amongst the other factors, such things as splice 
losses and connector 
losses (if applicable).
.RT
.sp 1P
.LP
3.1
	\fIAttenuation\fR 
.sp 9p
.RT
.PP
The attenuation \fIA\fR of an elementary cable section is given
by:
\v'6p'
.RT
.sp 1P
.ce 1000
\fIA\fR = 
@ pile { fIm\fR above sum above \fIn\fR~=1 } @ \fIa\fR\d\fIn\fR\u\(mu \fIL\fR\d\fIn\fR\u+ \fIa\fR\d\fIs\fR\u\(mu \fIX\fR + \fIa\fR\d\fIc\fR\u\(mu
\fIy\fR 
.ce 0
.sp 1P
.LP
.sp 1
.LP
where
.LP
	\fIa\fR\d\fIn\fR\u	=
	attenuation coefficient of \fIn\fR th fibre in
elementary cable section,
.LP
	\fIL\fR\d\fIn\fR\u	=
	length of \fIn\fR th fibre,
.LP
	\fIm\fR 	=
	total number of concatenated fibres in elementary
cable section,
.LP
	\fIa\fR 	=
	mean splice loss,
.LP
	\fIX\fR 	=
	number of splices in elementary cable section,
.LP
	\fIa\fR\d\fIc\fR\u	=
	mean loss of line connectors,
.LP
	\fIy\fR 	=
	number of line connectors in elementary cable section  (if provided).
.PP
A suitable allowance should be allocated for a suitable cable
marging for future modifications of cable configurations (additional splices, 
extra cable lengths, aging effects, temperature variations, etc.). The 
above 
equation does not include the loss of equipment connectors.
.PP
The mean loss is used for the loss splices and connectors. The
attenuation budget used in designing an actual system should account for the
statistical variations in these parameters.
.bp
.RT
.sp 1P
.LP
3.2
	\fIChromatic dispersion\fR 
.sp 9p
.RT
.PP
The chromatic dispersion in ps can be calculated from the chromatic dispersion 
coefficients of the factory lengths, assuming a linear dependence on length, 
and with due regard for the signs of the coefficients and system source 
characteristics (see\ \(sc\ 2.2). 
.RT
.ce 1000
ANNEX A
.ce 0
.ce 1000
(to Recommendation G.653)
.sp 9p
.RT
.ce 0
.ce 1000
\fBMeaning of the terms used in the Recommendation\fR 
.sp 1P
.RT
.ce 0
.PP
Most of the definitions contained in Annex\ A to
Recommendation\ G.652 are in principle applicable also to dispersion\(hyshifted
fibre. Because of limited experience with this type of fibre, further study 
of the suitability of some definitions is needed. 
.sp 1P
.RT
.ce 1000
ANNEX B
.ce 0
.ce 1000
(to Recommendation G.653)
.sp 9p
.RT
.ce 0
.ce 1000
\fBTest Methods for dispersion\(hyshifted single\(hymode fibres\fR 
.sp 1P
.RT
.ce 0
.PP
The present experience on dispersion\(hyshifted single\(hymode
fibres is rather limited; therefore further study is needed on some Reference 
and Alternative Test Methods for this type of fibre. Nevertheless, most 
of the test methods described in Annex\ B to Recommendation\ G.652 are 
in principle 
applicable also to dispersion\(hyshifted fibres. Therefore, for this Annex,
reference is made to the corresponding Test Methods of Annex\ B in
Recommendation\ G.652; the specifics of each test procedure need further 
study. It should be noted that the working wavelength for\ G.653 fibres 
is in the 
1550\ nm region.
.sp 1P
.RT
.sp 2P
.LP
\fBRecommendation G.654\fR 
.RT
.sp 2P
.ce 1000
\fBCHARACTERISTICS OF A 1550 nm WAVELENGTH LOSS\(hyMINIMIZED\fR 
.EF '%	Fascicle\ III.3\ \(em\ Rec.\ G.654''
.OF '''Fascicle\ III.3\ \(em\ Rec.\ G.654	%'
.ce 0
.sp 1P
.ce 1000
\fBSINGLE\(hyMODE OPTICAL FIBRE CABLE\fR 
.ce 0
.sp 1P
.ce 1000
\fI(Melbourne, 1988)\fR 
.sp 9p
.RT
.ce 0
.sp 1P
.LP
	The CCITT,
.sp 1P
.RT
.sp 1P
.LP
\fIconsidering\fR 
.sp 9p
.RT
.PP
(a)
that very low loss fibres are required in some
telecommunication network applications;
.PP
(b)
that the foreseen potential applications may require
several kinds of single\(hymode fibres differing in:
.LP
	\(em
	geometrical characteristics;
.LP
	\(em
	operation wavelength;
.LP
	\(em
	attenuation, dispersion and other optical
characteristics,
.PP
(c)
that Recommendations on different kinds of single\(hymode
fibres can be prepared when practical use studies have sufficiently
progressed,
.sp 1P
.LP
\fIrecommends\fR 
.sp 9p
.RT
.PP
a single\(hymode fibre which has the zero dispersion wavelength in
the\ 1300\ nm wavelength region, which is loss minimized at a wavelength
around\ 1550\ nm and which is designed for use in this region.
.bp
.PP
The geometrical, optical and transmission characteristics of this fibre 
are described below. 
.PP
The meaning of the terms used in this Recommendation are given in
Annex\ A, and the guidelines to be followed in the measurements to verify the
various characteristics are indicated in Annex\ B.
.PP
\fINote\fR \ \(em\ The characteristics of this fibre and the relevant values
will be refined as studies and experience progress.
.RT
.sp 2P
.LP
\fB1\fR 	\fBFibre characteristics\fR 
.sp 1P
.RT
.sp 1P
.LP
1.1
	\fIMode field diameter\fR 
.sp 9p
.RT
.PP
The nominal value of the mode field diameter at 1550\ nm shall
be\ xx\ \(*mm. The mode field diameter deviation should not exceed the limits
of\ \(+-\ 10% of the nominal value.
.PP
\fINote\fR \ \(em\ The value for xx has to be specified. A value of\ 10.5 
for\ xx is one possibility. 
.RT
.sp 1P
.LP
1.2
	\fICladding diameter\fR 
.sp 9p
.RT
.PP
Under study.
.FE
The recommended nominal value of the cladding diameter is\ 125\ \(*mm. 
The cladding deviation should not exceed the limits of\ \(+-\ 2.4% 
(\(+-\ 3\ \(*mm).
.RT
.sp 1P
.LP
1.3
	\fIMode field concentricity error\fR 
.sp 9p
.RT
.PP
The recommended mode field concentricity error at\ 1550\ nm should
not exceed\ 1\ \(*mm
.
.RT
.sp 2P
.LP
1.4
	\fINon\(hycircularity\fR 
.sp 1P
.RT
.sp 1P
.LP
1.4.1
	\fIMode field non\(hycirculatory\fR 
.sp 9p
.RT
.PP
In practice, the mode field non\(hycircularity of fibres having
nominally circular mode fields is found to be sufficiently low that propagation 
and jointing are not affected. It is therefore not considered necessary 
to 
recommend a particular value for the mode field non\(hycircularity. It is not
normally necessary to measure the mode field non\(hycircularity for acceptance
purposes.
.RT
.sp 1P
.LP
1.4.2
	\fICladding non\(hycircularity\fR 
.sp 9p
.RT
.PP
The cladding non\(hycircularity should be less than\ 2%. For some
particular jointing techniques and joint loss requirements, other tolerances
may be appropriate.
.RT
.sp 1P
.LP
1.5
	\fICut\(hyoff wavelength\fR 
.sp 9p
.RT
.PP
The cut\(hyoff wavelength values shall be between\ xxxx\ nm and\ yyyy\ 
nm for \(*l\dc\u, and smaller than\ zzzz\ nm 
for \(*l\dc\\dc\u.
.PP
\fINote\fR \ \(em\ The values for xxxx, yyyy and\ zzzz have to be specified;
values of 1350 for\ xxxx, 1600 for\ yyyy and 1530 for\ zzzz are one
possibility.
.RT
.sp 1P
.LP
1.6
	\fI1550 nm bend loss performance\fR 
.sp 9p
.RT
.PP
Under study.
.PP
\fINote\fR \ \(em\ The performance of this fibre should not be worse than 
fibre designed to meet Recommendation\ G.653. 
.RT
.sp 1P
.LP
1.7
	\fIMaterial properties of the fibre\fR 
.sp 9p
.RT
.PP
This is given in \(sc\ 1.7 of Recommendation\ G.652.
.RT
.sp 1P
.LP
1.8
	\fIExample of fibre design guidelines\fR 
.sp 9p
.RT
.PP
Supplement No.\ 33 gives an example of fibre design guidelines for matched 
cladding fibres used by one organization. 
.bp
.RT
.sp 2P
.LP
\fB2\fR 	\fBFactory length specifications\fR 
.sp 1P
.RT
.sp 1P
.LP
2.1
	\fIAttenuation coefficient\fR 
.sp 9p
.RT
.PP
Optical fibre cables covered by this Recommendation shall have
attenuation coefficients in the 1550\ nm region
.
.PP
\fINote\fR \ \(em\ The lowest values depend on fabrication process, fibre
composition and design, and cables design. Values of\ 0.15 to 0.20\ dB/km 
in the 1550\ nm region have been achieved. 
.RT
.sp 1P
.LP
2.2
	\fIChromatic dispersion coefficient\fR 
.sp 9p
.RT
.PP
The maximum chromatic dispersion coefficient in the 1550\ nm
wavelength region of single\(hymode fibres covered in this Recommendation shall
be\ 20\ ps/(nm | (mu | m).
.RT
.sp 2P
.LP
\fB3\fR 	\fBElementary cable sections\fR 
.sp 1P
.RT
.PP
As given in\ \(sc\ 3 of Recommendation\ G.652.
.RT
.ce 1000
ANNEX A
.ce 0
.ce 1000
(to Recommendation G.654)
.sp 9p
.RT
.ce 0
.ce 1000
\fBMeaning of the terms used in the Recommendation\fR 
.sp 1P
.RT
.ce 0
.PP
Most of the definitions contained in Annex\ A to
Recommendation\ G.652 are in principle applicable also to loss\(hyminimized 
fibre. Because of limited experience with this type of fibre, further study 
of the 
suitability of some definitions is needed.
.sp 1P
.RT
.ce 1000
ANNEX B
.ce 0
.ce 1000
(to Recommendation G.654)
.sp 9p
.RT
.ce 0
.ce 1000
\fBTest methods for loss\(hyminimized single\(hymode fibres\fR 
.sp 1P
.RT
.ce 0
.PP
The present experience on loss\(hyminimized single\(hymode fibres is
rather limited; therefore further study is needed on some Reference and
Alternative Test Methods for this type of fibre. Nevertheless, most of 
the test methods described in Annex\ B to Recommendation\ G.652 are in 
principle 
applicable also to loss\(hyminimized fibres. Therefore, for this Annex, 
reference is made to the corresponding Test Methods of Annex\ B in Recommendation\ 
G.652; the specifics of each test procedure need further study. It should 
be noted 
that the working wavelength for\ G.654 fibres is in the 1550\ nm region.
.sp 1P
.RT
.LP
.sp 10
.bp
.sp 1P
.ce 1000
\v'12P'
\s12PART\ II
\v'4P'
.RT
.ce 0
.sp 1P
.ce 1000
\fBSUPPLEMENTS\ TO\ RECOMMENDATIONS\ IN\fR 
.EF '%	 \ \ \ ^''
.OF ''' \ \ \ ^	%'
.ce 0
.sp 1P
.ce 1000
\fBSECTION\ 6\ OF\ THE\ SERIE\ G\ RECOMMENDATIONS\fR 
.ce 0
.sp 1P
.LP
.rs
.sp 33P
.ad r
Blanc
.EF '%	 \ \ \ ^''
.OF ''' \ \ \ ^	%'
.ad b
.RT
.LP
.bp
.LP
\fBMONTAGE:\ \fR PAGE 118 = PAGE BLANCHE
.sp 1P
.RT
.LP
.bp
.LP
.EF '%	Fascicle\ III.3\ \(em\ Suppl.\ No.\ 11''
.OF '''Fascicle\ III.3\ \(em\ Suppl.\ No.\ 11	%'
.ce
\fBH.T. [1T1.11]\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
lw(342p) .
\fBSupplement No. 11\fR
.T&
cw(342p) .
 {
\fBDATA\ ON\ CABLE\ SHIPS\ AND\ SUBMERSIBLE\ EQUIPMENTS\ OF\ VARIOUS\fR
\fB | OUNTRIES\fR
 }
.T&
cw(342p) .
 {
\fI(Mar del Plata, 1968, amended at Geneva, 1972, 1976, 1980, 1984 and\fR
\fI1988; referred to in Subsection 6.3 of the Series\fR
\fIG Recommendations)\fR
 }
.T&
lw(342p) .
Section 1\ \(em\ CABLE SHIPS
.TE
.TS
center box ;
cw(24p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) sw(18p) sw(18p) | cw(18p) sw(18p) sw(18p) | cw(18p) | cw(66p) , ^  | ^  | ^  | ^  | ^  | ^  | ^  | ^  | c s | ^ | ^ | ^ | ^ | ^ , ^  | ^  | ^  | ^  | ^  | ^  | ^  | ^  | c | c | c | c | c s | ^ , ^  | ^  | ^  | ^  | ^  | ^  | ^  | ^  | ^  | ^  | ^  | ^  | c | c | ^ | ^ .
Name of ship 	 {
Year of
con\(hy
struc\(hy
tion
 }	Displacement  (tons)	Overall length  (m)	Draft  (m)	Normal speed  (knots)	 {
Range (autonomy)
(nautical miles)
 }	Number of tanks	Cable capacity	Cable gear	Maximum operating depth  (m)	Capability
													Cable
								Cubic metres  (m\u3\d)	Weight   (tons)	Repeaters	 {
Forward cable drum (diameter)
(m)
 }	Unwinding pulley
												Bow sheave (diameter)  (m)	Stern sheave (diameter)  (m)
_
.T&
lw(132p) | lw(18p) | cw(36p) | lw(18p) | lw(138p) .
		CANADA		
.T&
cw(24p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | lw(66p) .
\fIJohn Cabot\fR	1985	6400	95	7	13/16	6500	3	614	800	24	 {
1\(mu3.0
(30 t)
+
linear engine
(18 pairs
of
wheels)
 }	3.0	\(em	All	 {
Repair ship. Plough capabilities.
 }
.T&
lw(150p) | cw(36p) | lw(156p) .
	DENMARK	
.T&
lw(114p) | cw(108p) | lw(120p) .
	 {
\fIShip belonging to Telecom Denmark\fR
 }	
.T&
cw(24p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | lw(66p) .
\fIPeter Faber\fR	1982	Open  750  Closed  1830	78.4	Open  3.8  Closed  5.0	14.0	7000	1 tank  1 hold	310  230	600  400	App.  10	3.0	3.0	\(em	4000	 {
Reinforced for operation in ice\(hyfilled waters. 
On the aft deck:
one
A\(hyframe with hydraulic topping. Max. load 35 tons. One hydraulic towing
and general purpose winch. Two hydraulic double\(hydrum warping winches.
 }
_
.TE
.nr PS 9
.RT
.ad r
\fBTable [1T1.11], p. (disposition \*`a l'italienne)\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [2T1.11]\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
lw(342p) .
 {
Section 1\ \(em\ CABLE SHIPS \fI(cont.)\fR
 }
.TE
.TS
center box;
cw(24p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) sw(18p) sw(18p) | cw(18p) sw(18p) sw(18p) | cw(18p) | cw(66p) , ^  | ^  | ^  | ^  | ^  | ^  | ^  | ^  | c s | ^ | ^ | ^ | ^ | ^ , ^  | ^  | ^  | ^  | ^  | ^  | ^  | ^  | c | c | c | c | c s | ^ , ^  | ^  | ^  | ^  | ^  | ^  | ^  | ^  | ^  | ^  | ^  | ^  | c | c | ^ | ^ .
Name of ship 	 {
Year of
con\(hy
struc\(hy
tion
 }	Displacement  (tons)	Overall length  (m)	Draft  (m)	Normal speed  (knots)	 {
Range (autonomy)
(nautical miles)
 }	Number of tanks	Cable capacity	Cable gear	Maximum operating depth  (m)	Capability
													Cable
								Cubic metres  (m\u3\d)	Weight   (tons)	Repeaters	 {
Forward cable drum (diameter)
(m)
 }	Unwinding pulley
												Bow sheave (diameter)  (m)	Stern sheave (diameter)  (m)
_
.T&
lw(132p) | lw(18p) | cw(36p) | lw(18p) | lw(138p) .
		FRANCE		
.T&
cw(24p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | lw(66p) .
\fIVercors\fR	1974	10 | 70	133	7.3	16.5	13 | 00	3	2535	6000*	140	2\(mu3.0  (30t)	3.0	 {
4.0
+
linear engine (18 pairs
of wheels)
 }	All	 {
Laying and repair of all types of telephone (coaxial and optical fibre)
and power cables. Capacity: 3500 km deep\(hysea optical fibre cables,
1300 nautical miles 1\(hyinch cable; 650 nautical miles 1.5\(hyinch cable;
500 nautical miles 1.7\(hyinch cable.
*
A different weight in the case of power cable.
 }
.T&
cw(24p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | lw(66p) .
\fIL\*'eon Th\*'evenin\fR	1983	6200	107	6.25	15.0	10 | 00	2	1060	1000	30	2\(mu3.4  (40t)	3.0	 {
4.0
+
linear engine
(18 pairs
of wheels)
 }	All	 {
Repair ship, armoured coaxial and optical fibre cables.
 }
.T&
cw(24p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | lw(66p) .
\fIRaymond Croze\fR	1983	6200	107	6.25	15.0	10 | 00	2	1400	1300	70	2\(mu3.4  (40t)	3.0	 {
4.0
+
linear engine
(8 pairs
of wheels)
 }	All	 {
Lays/repairs\(emapprox. half the strage capacity of the \fIVercors\fR
.
\fINote\fR
\ \(em\ 
\fIL\*'eon Th\*'evenin\fR
 | and \fIRaymond Croze\fR
are identical except
for the positioning of the cable tanks.
 }
_
.TE
.nr PS 9
.RT
.ad r
\fBTable [2T1.11], p. (disposition \*`a l'italienne)\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [3T1.11]\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
lw(342p) .
 {
Section 1\ \(em\ CABLE SHIPS \fI(cont.)\fR
 }
.TE
.TS
center box;
cw(24p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) sw(18p) sw(18p) | cw(18p) sw(18p) sw(18p) | cw(18p) | cw(66p) , ^  | ^  | ^  | ^  | ^  | ^  | ^  | ^  | c s | ^ | ^ | ^ | ^ | ^ , ^  | ^  | ^  | ^  | ^  | ^  | ^  | ^  | c | c | c | c | c s | ^ , ^  | ^  | ^  | ^  | ^  | ^  | ^  | ^  | ^  | ^  | ^  | ^  | c | c | ^ | ^ .
Name of ship 	 {
Year of
con\(hy
struc\(hy
tion
 }	Displacement  (tons)	Overall length  (m)	Draft  (m)	Normal speed  (knots)	 {
Range (autonomy)
(nautical miles)
 }	Number of tanks	Cable capacity	Cable gear	Maximum operating depth  (m)	Capability
													Cable
								Cubic metres  (m\u3\d)	Weight   (tons)	Repeaters	 {
Forward cable drum (diameter)
(m)
 }	Unwinding pulley
												Bow sheave (diameter)  (m)	Stern sheave (diameter)  (m)
_
.T&
lw(114p) | cw(108p) | lw(120p) .
	ITALY	
.T&
lw(114p) | cw(108p) | lw(120p) .
	 {
\fIShips belonging to Pirelli/Euroshipping\fR
 }	
.T&
cw(24p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | lw(66p) .
\fIArabella\fR	1975	2620	76.66	5.18	11	2000	2	1100	2000	\(em	\(em	\(em	3	All	Lay/repair
.T&
cw(24p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | lw(66p) .
\fIG. Verne\fR	1983	13 | 00	127.5	5.37	10	5000	3	5000	12 | 00	\(em	\(em	\(em	6	All	Stern only 
.T&
lw(150p) | cw(36p) | lw(156p) .
	JAPAN	
.T&
lw(114p) | cw(108p) | lw(120p) .
	 {
\fI1.\ Ship belonging to KDD\fR
 }	
.T&
cw(24p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | lw(66p) .
\fIKDD Maru\fR	1967	6026	113.83	6.3	16	7000	3	1012	2700	70	3.6	3.0	Shute  4.0	All	 {
Lays and repairs all types of telephone cables.
 }
.T&
lw(114p) | cw(108p) | lw(120p) .
	 {
\fI2.\ Ships belonging to NTT\fR
 }	
.T&
cw(24p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | lw(66p) .
 {
\fINTT\fR
\fITsugaru Maru\fR
 }	1969	1961	84.6	4.60	13.5	4000	1	320	650	50	3.3	2.5	1.8	5000	 {
Lays and repairs all types of telephone cables.
 }
.T&
cw(24p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | lw(66p) .
 {
\fINTT\fR
\fIKuroshio Maru\fR
 }	1974	3345	119.3	5.60	16.5	6883	3	887	1200	95	3.8	3.0	2.0	All	 {
Laying by linear engine. Lays and repairs all types of telephone
cables.
 }
.T&
cw(24p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | lw(66p) .
 {
\fINTT\fR
\fISetouchi Maru\fR
 }	1979	819	64.8	3.50	12.0	3690	2	139	250	20	2.5	\(em	1.5	5000	 {
Lays and repairs all types of telephone cables.
 }
.T&
cw(24p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | lw(66p) .
 {
\fINTT\fR
\fIKoyo Maru\fR
 }	1983	1295	74.0	43.50	13.5	4500	2	169	250	20	3.0	2.5	2.0	All	 {
Laying by linear engine. Lays and repairs all types of telephone
cables (especially optical cables). 
 }
_
.TE
.nr PS 9
.RT
.ad r
\fBTable [3T1.11], p. (disposition \*`a l'italienne)\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [4T1.11]\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
lw(342p) .
 {
Section 1\ \(em\ CABLE SHIPS \fI(cont.)\fR
 }
.TE
.TS
center box;
cw(24p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) sw(18p) sw(18p) | cw(18p) sw(18p) sw(18p) | cw(18p) | cw(66p) , ^  | ^  | ^  | ^  | ^  | ^  | ^  | ^  | c s | ^ | ^ | ^ | ^ | ^ , ^  | ^  | ^  | ^  | ^  | ^  | ^  | ^  | c | c | c | c | c s | ^ , ^  | ^  | ^  | ^  | ^  | ^  | ^  | ^  | ^  | ^  | ^  | ^  | c | c | ^ | ^ .
Name of ship 	 {
Year of
con\(hy
struc\(hy
tion
 }	Displacement  (tons)	Overall length  (m)	Draft  (m)	Normal speed  (knots)	 {
Range (autonomy)
(nautical miles)
 }	Number of tanks	Cable capacity	Cable gear	Maximum operating depth  (m)	Capability
													Cable
								Cubic metres  (m\u3\d)	Weight   (tons)	Repeaters	 {
Forward cable drum (diameter)
(m)
 }	Unwinding pulley
												Bow sheave (diameter)  (m)	Stern sheave (diameter)  (m)
_
.T&
lw(114p) | cw(108p) | lw(120p) .
	UNITED KINGDOM	
.T&
lw(114p) | cw(108p) | lw(120p) .
	 {
\fI1.\ Ships belonging to British Telecom (Marine) Limited\fR
 }	
.T&
cw(24p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | lw(66p) .
\fIAlert\fR	1961	9477	130	7.1	14	10 | 00	3	1509	3100	48	2.98	2.98	2.98	All	 {
Laying by linear engine and sea\(hybed burial by plow.
Lays/repairs all types of coaxial and optical fibre cables.
 }
.T&
cw(24p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | lw(66p) .
\fIMonarch\fR	1975	4639	97	5.5	14	7000	4	417	850	12	3.00	3.00	None	All	 {
Lays/repairs armoured coaxial and optical fibre cables. Repairs
lightweight coaxial and optical fibre cables. Detrenching/reburial by
submersible jetting.
 }
.T&
cw(24p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | lw(66p) .
\fIIris\fR	1976	4639	97	5.5	14	7000	4	417	850	12	3.00	3.00	None	All	 {
Lays/repairs armoured coaxial and optical fibre cables. Repairs
lightweight coaxial and optical fibre cables.
 }
.T&
lw(114p) | cw(108p) | lw(120p) .
	 {
\fI2.\ Ships belonging to Cable & Wireless (Marine) Limited\fR
 }	
.T&
cw(24p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | lw(66p) .
\fIRetreiver\fR	1961	5650	112	5,82	13	8000	3	629	1568	11	3.0	3.0	Shute  3.05	All	 {
Lays/repairs armoured cables.
Repairs lightweight cables.
 }
.T&
cw(24p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | lw(66p) .
\fINorthern\fR	1962	3363	83.5	5.3	10	7200	3	480	1000	3	3.0	3.0	None	3500	Bow only, repair ship.
.TE
.LP
\fINote\fR
\ \(em\ Only relatively short cables are laid and only shore\(hyends.
.nr PS 9
.RT
.ad r
\fBTable [4T1.11], p. (disposition \*`a l'italienne)\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [5T1.11]\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
lw(342p) .
 {
Section 1\ \(em\ CABLE SHIPS \fI(end)\fR
 }
.TE
.TS
center box;
cw(24p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) sw(18p) sw(18p) | cw(18p) sw(18p) sw(18p) | cw(18p) | cw(66p) , ^  | ^  | ^  | ^  | ^  | ^  | ^  | ^  | c s | ^ | ^ | ^ | ^ | ^ , ^  | ^  | ^  | ^  | ^  | ^  | ^  | ^  | c | c | c | c | c s | ^ , ^  | ^  | ^  | ^  | ^  | ^  | ^  | ^  | ^  | ^  | ^  | ^  | c | c | ^ | ^ .
Name of ship 	 {
Year of
con\(hy
struc\(hy
tion
 }	Displacement  (tons)	Overall length  (m)	Draft  (m)	Normal speed  (knots)	 {
Range (autonomy)
(nautical miles)
 }	Number of tanks	Cable capacity	Cable gear	Maximum operating depth  (m)	Capability
													Cable
								Cubic metres  (m\u3\d)	Weight   (tons)	Repeaters	 {
Forward cable drum (diameter)
(m)
 }	Unwinding pulley
												Bow sheave (diameter)  (m)	Stern sheave (diameter)  (m)
_
.T&
lw(96p) | cw(144p) | lw(102p) .
	 {
\fI2.\ Ships belonging to Cable & Wireless (Marine) Limited (cont.)\fR
 }	
.T&
cw(24p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | lw(66p) .
\fICable Venture\fR	1962	16 | 83	153	8.97	12.5	10 | 00	4+1  (spare)	5086	9000	400	2.80	3.00	3.39	All	 {
Laying by linear cable engine.
Lays and repairs armoured and
lightweight coaxial cables.
 }
.T&
cw(24p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | lw(66p) .
\fIMercury\fR	1962	11 | 83	144	7.5	14.5	8000	3	2970	3500	144	3.05	3.50	Shute  3.05	All	Ditto
.T&
cw(24p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | lw(66p) .
\fICable Enterprise\fR	1964	5759	113	5.84	13	8000	3	887	2150	30	2.8	3.00	Shute   3.05	All	 {
Lays/repairs armoured cables. 
Repairs lightweight cables.
(See Note)
 }
.T&
cw(24p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | lw(66p) .
\fICable Protector\fR	1976	4608	86	4.7	10.0	7200	2	1272	1060	Nil	Nil	Nil	3.00	1000	 {
2.6 m stern cable drum and small LCE.
 }
.T&
cw(24p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | lw(66p) .
\fIPacific Guardian\fR	1984	7526	116	6.32	14.0	8000	3	1416	3470	96	3.5	3.00	3.00	All	 {
Laying by linear cable engine. 
Lays and repairs armoured and
lightweight coaxial cables.
 }
.T&
lw(114p) | cw(108p) | lw(120p) .
	UNITED STATES OF AMERICA	
.T&
lw(114p) | cw(108p) | lw(120p) .
	 {
\fIShips belonging to AT&T\fR
 }	
.T&
cw(24p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | lw(66p) .
\fICharlie Brown\fR	1952	2881	99.9	5.8	15	7000	3	660	2122	\(em	3.66	3.66	N/A	All	 {
Repairs all types of telephone cables. Lays short and shore
systems.
 }
.T&
cw(24p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | cw(18p) | lw(66p) .
\fILong Lines\fR	1963	11 | 26	156	7.9	15	10 | 00 \fR	3	4420	7000	125	3.66	3.05	3.66	All	Lays/repairs all types of telephone cables.
.TE
.LP
\fINote\fR
\ \(em\ Only relatively short cables are laid and only shore\(hyends.
.nr PS 9
.RT
.ad r
\fBTable [5T1.11], p. (disposition \*`a l'italienne)\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [1T2.11]\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
lw(342p) .
 {
Section 2\ \(em\ SUBMERSIBLE\ EQUIPMENTS
 }
.TE
.TS
center box;
cw(36p) | cw(30p) | cw(30p) | cw(30p) | cw(30p) | cw(36p) | cw(36p) | cw(36p) | cw(30p) | cw(48p) .
Type of submersible	Displacement (tons)	Overall  length  (m)	Width  (m)	Height	Trenching system	Trenching	Propulsion	Max. operating depth  (m)	Capability
_
.T&
cw(36p) | cw(30p) | cw(30p) | cw(30p) | cw(30p) | cw(36p) | cw(36p) | cw(36p) | cw(30p) | cw(48p) .
					FRANCE				
_
.T&
cw(36p) | cw(30p) | cw(30p) | cw(30p) | cw(30p) | lw(36p) | lw(36p) | lw(36p) | cw(30p) | lw(48p) .
 {
\fISubmersible\fR
\fIplough\fR
\fIsystem\fR
 }	23	9.06	3	2.90	Ploughshare	 {
Immediate burial of cable (up to 0.7 m) on ploughing
 }	Towed by support ship	950	 {
Lay and bury cables and small pipes.
 }
_
.T&
cw(36p) | cw(30p) | cw(30p) | cw(30p) | cw(30p) | lw(36p) | lw(36p) | lw(36p) | cw(30p) | lw(48p) .
 {
\fISelf\(hyadvancing buried system\fR
 }	11.3	5.50	2.45	3.50	Trenching wheel or chain	 {
Burial of existing cables down to 2\ m
 }	Tracked vehicle	150	Burial of cables and pipes.
_
.T&
lw(126p) | cw(102p) | lw(114p) .
	 {
JAPAN
\fI1.\ Submersibles belonging to KDD\fR
 }	
_
.T&
cw(36p) | cw(30p) | cw(30p) | cw(30p) | cw(30p) | cw(36p) | lw(36p) | lw(36p) | cw(30p) | lw(48p) .
 {
\fIKS\(hy2\fR
\fIcable plough\fR
 }	9.3	11.2	2.56	2.0	\(em	 {
Immediate burial of cable on ploughing
 }	Towed by support ship	200	 {
Lay and bury cable in one action.
 }
_
.T&
cw(36p) | cw(30p) | cw(30p) | cw(30p) | cw(30p) | lw(36p) | lw(36p) | lw(36p) | cw(30p) | lw(48p) .
\fIMARCAS crawler\fR	4.7	4.0	3.0	2.15	Fluidisation jets	Fluidisation jets	Track drive	200	Trench in existing cable.
_
.T&
cw(36p) | cw(30p) | cw(30p) | cw(30p) | cw(30p) | lw(36p) | lw(36p) | lw(36p) | cw(30p) | lw(48p) .
\fIMARCAS\(hy2500\fR	3.6	2.65	1.8	1.9	Fluidisation jets	Fluidisation jets	 {
2 vertical and 4 horizontal thrusters
 }	2500	 {
Post\(hylay burial, maintenance of cable and survey of senbed.
 }
_
.T&
lw(126p) | cw(102p) | lw(114p) .
	 {
\fI2.\ Submersibles belonging to NTT\fR
 }	
_
.T&
cw(36p) | cw(30p) | cw(30p) | cw(30p) | cw(30p) | cw(36p) | lw(36p) | lw(36p) | cw(30p) | lw(48p) .
 {
\fIPlough\(hytype Mark IV submarine cable burying system\fR
 }	16.8	8.4	4.0	4.0	\(em	 {
Up to 1.5 m depth, immediate burial of cable on ploughing
 }	Towed by support ship	500	 {
Simultaneous or post\(hylay burial of cable.
 }
_
.T&
cw(36p) | cw(30p) | cw(30p) | cw(30p) | cw(30p) | lw(36p) | lw(36p) | lw(36p) | cw(30p) | lw(48p) .
 {
\fISelf\(hyadvancing burying system\fR
\fR
 }	3.5	3.4	2.3	1.8	 {
Fluidisation, and cutting jets, and dredge pump
 }	 {
Up to 1.5 m depth with cutting and fluidisation jets
 }	 {
Self\(hyadvancing by water jets
 }	40	Trench in existing cable.
_
.TE
.nr PS 9
.RT
.ad r
\fBTable [1T2.11], p. (disposition \*`a l'italienne)\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [2T2.11]\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
lw(342p) .
 {
Section 2\ \(em\ SUBMERSIBLE\ EQUIPMENTS \fI(cont.)\fR
 }
.TE
.TS
center box;
cw(36p) | cw(30p) | cw(30p) | cw(30p) | cw(30p) | cw(36p) | cw(36p) | cw(36p) | cw(30p) | cw(48p) .
Type of submersible	Displacement (tons)	Overall  length  (m)	Width  (m)	Height (m)	Tranching system	Trenching	Propulsion	Max. operating depth  (m)	Capability
_
.T&
lw(126p) | cw(102p) | lw(114p) .
	 {
UNITED KINGDOM
\fI1.\ Submersibles belonging to British Telecom\fR
\fI(Marine) Ltd.\fR
 }	
_
.T&
cw(36p) | cw(30p) | cw(30p) | cw(30p) | cw(30p) | lw(36p) | lw(36p) | lw(36p) | cw(30p) | lw(48p) .
 {
\fISubmersible trencher\fR
 }	17.0	6.6	4	3.4	 {
Fluidisation and cutting jets and dredge pump
 }	 {
Up to 1 m depth with cutting and fluidisation jets
 }	 {
Three vertical and four horizontal thrusters, track drive differential
steering
 }	274	 {
Trench in existing cable and pipe.
 }
_
.T&
cw(36p) | cw(30p) | cw(30p) | cw(30p) | cw(30p) | lw(36p) | lw(36p) | lw(36p) | cw(30p) | lw(48p) .
 {
\fISubmersible plough system\fR
 }	9.75	6.1	2.6	2.6	Ploughshare preceded by disc	 {
Immediate burial of cable on ploughing
 }	Towed by support ship	900	 {
Lay and bury cable, umbilical and pipe in one action giving
full cable protection. 
 }
_
.T&
cw(36p) | cw(30p) | cw(30p) | cw(30p) | cw(30p) | lw(36p) | lw(36p) | lw(36p) | cw(30p) | lw(48p) .
 {
\fIModular plough system\fR
 }	40	14	6	4.5	Ploughshare preceded by disc	 {
Immediate burial of cable on ploughing
 }	Towed by support ship	350	 {
Simultaneous or post lay burial of cable and umbilicals post
lay burial of pipeline.
 }
_
.T&
lw(126p) | cw(102p) | lw(114p) .
	 {
\fI2.\ Submersibles belonging to Cables & Wireless \fR
\fI(Marine) Ltd.\fR
 }	
_
.T&
cw(36p) | cw(30p) | cw(30p) | cw(30p) | cw(30p) | lw(36p) | lw(36p) | lw(36p) | cw(30p) | lw(48p) .
 {
\fIRemote control submersible, Cirrus\fR
 }	3.2	3.5	2.1	2.3	Water jets	Trenching capability 0.3\ m	Thrusters (7)	1000	 {
Visual inspection cable location/inspection/
deburial. Manipulation.
 }
_
.T&
cw(36p) | cw(30p) | cw(30p) | cw(30p) | cw(30p) | lw(36p) | lw(36p) | lw(36p) | cw(30p) | lw(48p) .
\fICWM sea bed plough\fR	12.0	7.2	4.0	2.5	Passive blade	Trenching capability 0.9\ m	Towed	1000	 {
Steerable. Backfill Capability Partial Repeater burial.
 }
_
.TE
.nr PS 9
.RT
.ad r
\fBTable [2T2.11], p. (disposition \*`a l'italienne)\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [3T2.11]\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
lw(342p) .
 {
Section 2\ \(em\ SUBMERSIBLE\ EQUIPMENTS \fI(end)\fR
 }
.TE
.TS
center box;
cw(36p) | cw(30p) | cw(30p) | cw(30p) | cw(30p) | cw(36p) | cw(36p) | cw(36p) | cw(30p) | cw(48p) .
Type of submersible	Displacement (tons)	Overall  length  (m)	Width  (m)	Height\fR (m)\fI	Tranching system	Trenching	Propulsion	Max. operating depth  (m)	Capability
_
.T&
lw(126p) | cw(102p) | lw(114p) .
	UNITED\ STATES\ OF\ AMERICA	
_
.T&
cw(36p) | cw(30p) | cw(30p) | cw(30p) | cw(30p) | cw(36p) | cw(36p) | cw(36p) | cw(30p) | lw(48p) .
\fISea plough IV A\fR	\(em	\(em	\(em	\(em	\(em	\(em	\(em	\(em	 {
Plough trench 16\*U wide to maximum 24\*U depth.
 }
_
.T&
cw(36p) | cw(30p) | cw(30p) | cw(30p) | cw(30p) | cw(36p) | cw(36p) | cw(36p) | cw(30p) | lw(48p) .
\fISea plough V\fR	\(em	\(em	\(em	\(em	\(em	\(em	\(em	\(em	 {
Same as 
\fIsea plough IV\ A.\fR
 }
_
.T&
cw(36p) | cw(30p) | cw(30p) | cw(30p) | cw(30p) | cw(36p) | cw(36p) | cw(36p) | cw(30p) | lw(48p) .
\fIScarab I/II\fR	\(em	\(em	\(em	\(em	\(em	\(em	\(em	\(em	 {
Multi owners used for maintenance.
 }
_
.TE
.nr PS 9
.RT
.ad r
\fBTable [3T2.11], p. (disposition \*`a l'italienne)\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.sp 2P
.LP
\fBSupplement\ No.\ 14\fR 
.RT
.sp 2P
.sp 1P
.ce 1000
\fBMETHODS\ FOR\ MEASURING\ REGULARITY\ RETURN\ LOSS\fR 
.EF '%	Fascicle\ III.3\ \(em\ Suppl.\ No\ 14''
.OF '''Fascicle\ III.3\ \(em\ Suppl.\ No\ 14	%'
.ce 0
.sp 1P
.ce 1000
\fI(referred to in Recommendation G.623;\fR 
.sp 9p
.RT
.ce 0
.ce 1000
\fIthis Supplement is to be found on page 669 of Fascicle III.3\fR 
.ce 0
.sp 1P
.ce 1000
\fIof Orange Book, Geneva, 1977)\fR \v'2P'
.ce 0
.sp 1P
.sp 2P
.LP
\fBSupplement\ No.\ 18\fR 
.RT
.sp 2P
.sp 1P
.ce 1000
\fBINFORMATION\ ON\ SUBMARINE\ CABLES\ USED\ IN\ DEEP\ WATER\fR 
.EF '%	Fascicle\ III.3\ \(em\ Suppl.\ No.\ 18''
.OF '''Fascicle\ III.3\ \(em\ Suppl.\ No.\ 18	%'
.ce 0
.sp 1P
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\fI(referred to in Subsection 6.3;\fR 
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\fIthis Supplement is to be found on page 313 of Fascicle III.2\fR 
.ce 0
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\fIof the Red Book, Geneva, 1985)\fR \v'2P'
.ce 0
.sp 1P
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.LP
\fBSupplement\ No.\ 19\fR 
.RT
.sp 2P
.ce 1000
\fBDIGITAL\ CROSSTALK\ MEASUREMENT\ (METHOD\ USED\ BY\fR 
.EF '%	Fascicle\ III.3\ \(em\ Suppl.\ No\ 19''
.OF '''Fascicle\ III.3\ \(em\ Suppl.\ No\ 19	%'
.ce 0
.sp 1P
.ce 1000
\fBTHE\ ADMINISTRATIONS\ OF\ FRANCE,\ THE\ NETHERLANDS\ AND\ SPAIN)\fR 
.ce 0
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\fI(referred to in Recommendation G.612;\fR 
.sp 9p
.RT
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\fIthis Supplement is to be found on page 326 of Fascicle III.2\fR 
.ce 0
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\fIof the Red Book, Geneva, 1985)\fR \v'2P'
.ce 0
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.LP
\fBSupplement\ No.\ 33\fR 
.RT
.sp 2P
.sp 1P
.ce 1000
\fBEXAMPLES\ OF\ FIBRE\ DESIGN\ GUIDELINES\fR 
.EF '%	Fascicle\ III.3\ \(em\ Suppl.\ No.\ 33''
.OF '''Fascicle\ III.3\ \(em\ Suppl.\ No.\ 33	%'
.ce 0
.sp 1P
.ce 1000
\fI(Diagrams used in Japan and in the United Kingdom)\fR 
.sp 9p
.RT
.ce 0
.sp 1P
.ce 1000
\fI(referred to in Recommendations G.652 and G.654)\fR 
.ce 0
.sp 1P
.PP
The following two diagrams provide and overview of the
characteristics of two particular types of fibre. The aim of these diagrams 
is to give guidance to potential fibre users when preparing optical fibre 
specifications.
.sp 1P
.RT
.PP
Figure 1, which is used in Japan and in the United Kingdom, gives empirically 
determined relationships between mode field diameter and cut\(hyoff 
wavelength, as independent variables, with 1550\ nm bend loss performance and
chromatic dispersion coefficients at 1285\ nm and 1330\ nm for matched\(hyclad,
single\(hymode fibre compliant with Rec.\ G.652. Two types of 1550\ nm 
bend loss 
performance tests are described, the Rec.\ G.652 test (37.5\ mm radius
mandrel/100\ turns, maximum loss 1.0\ dB) and the test most commonly specified 
in the United Kingdom (30\ mm radius mandrel/10\ turns, maximum loss 0.2\ 
dB). 
.PP
Figure 2, which is used by KDD, Japan, gives relationships between
mode field diameter and cut\(hyoff wavelength with theoretical 1550\ nm 
bend loss performance and various chromatic dispersion coefficients. This 
information is for matched\(hyclad, single\(hymode fibre which is compliant 
with Rec.\ G.654. 
.bp
.RT
.LP
.rs
.sp 47P
.ad r
\fBFigure 1/Supp.33, p.\fR 
.sp 1P
.RT
.ad b
.RT
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.bp
.LP
.rs
.sp 47P
.ad r
\fBFigure 2/Supp.33, p.\fR 
.sp 1P
.RT
.ad b
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.LP
.bp