.rs
.\" Troff code generated by TPS Convert from ITU Original Files
.\"                 Not Copyright ( c) 1991 
.\"
.\" Assumes tbl, eqn, MS macros, and lots of luck.
.TA 1c 2c 3c 4c 5c 6c 7c 8c
.ds CH
.ds CF
.EQ
delim @@
.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'
.ce 1000
ANNEX\ A
.ce 0
.ce 1000
(to Recommendation T.61)
.sp 9p
.RT
.ce 0
.ce 1000
\fBCode extension procedures\fR 
.sp 1P
.RT
.ce 0
.PP
A.1
The basic Teletex service makes use of an 8\(hybit coded
character set, which is implicitly designated and invoked as a default
condition according to \(sc\ 3.3.1.4.
.sp 1P
.RT
.PP
A.2
This 8\(hybit code contains the primary set of graphic characters as G0 
set in positions\ 2/1 to\ 7/14, the supplementary set of graphic 
characters as G2 set in positions\ 10/1 to\ 15/14, the primary set of control
characters in positions 0/0 to\ 1/15 and the supplementary set of control
characters in positions 8/0 to\ 9/15. The characters constituting these basic
sets are described in this Recommendation.
.sp 9p
.RT
.PP
A.3
For enhancement of the basic Teletex service the following code extension 
facilities will be provided: 
.sp 9p
.RT
.LP
	a)
	designation and invocation of control sets C0 and C1 by
means of the relevant 
escape sequences
. See Figure\ A\(hy1/T.61.
.LP
	b)
	designation of up to four graphic character sets called G0,  G1, G2 and G3;
.LP
	c)
	invocation of the designated graphic sets, by means of
locking and/or non\(hylocking shift functions
.
.PP
The shift functions used are:
.PP
LS0, LS1, LS1R, LS2, LS2R, LS3, LS3R, SS2, SS3.
.PP
According to ISO Standard 2022 the bit combination following SS2
or SS3 represents a character from columns 2 to 7, except positions 2/0 and
7/15, of a code table. All characters in columns\ 8 to\ 15 are excluded from
assignment to the bit combinations following SS2 or\ SS3. The use of a single
shift function does not affect the current status established by one or 
more of the locking\(hyshift functions. 
.PP
There are seven 
locking\(hyshift functions
used exclusively for graphic set extension. Each invokes an additional 
set of 94 graphic characters into columns\ 2 to\ 7 or into columns\ 10 
to\ 15. 
.PP
The single shift functions, the locking\(hyshift functions and the
related G\(hysets are shown in Table\ A\(hy1/T.61.
.RT
.PP
A.4
The shift functions are defined in \(sc\ E.3.2.3
and coded as specified in \(sc\ E.4.2.3.
.sp 9p
.RT
.PP
The use of shift functions is implicitly negotiated by
specifying the character sets during the negotiation procedure of terminal
capabilities in the control procedures of Recommendation\ T.62. All terminals
supporting graphic character code extension techniques must support shift
functions LSO, LS2R and\ SS2 in order to invoke the Teletex primary and
supplementary graphic character sets within a page.
.PP
A.5
For the designation and invocation of control sets the
following escape sequences are used:
.sp 9p
.RT
.LP
	C0 set ESC 2/1\ F
.LP
	C1 set ESC 2/2\ F
.PP
The symbol F denotes the final bit combination of an escape
sequence.
.PP
The final characters F have to be provided by CCITT and ISO.
.RT
.PP
A.6
For the designation of CCITT/ISO registered graphic character sets the 
escape sequence formats shown in Table\ A\(hy2/T.61 are used. 
.bp
.sp 9p
.RT
.LP
.rs
.sp 47P
.ad r
\fBFIGURE A\(hy1/T.61, p. 1\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [T4.61]\fR 
.ce
TABLE\ A\(hy1/T.61
.ce
\fBAllocation of shift functions to the
.ce
graphic character sets\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
cw(48p) | cw(60p) sw(60p) | cw(60p) , ^  | c | c | c.
Graphic character set 	 {
Locking shift functions for invocation of G\(hyset to positions
 }	 {
Non\(hylocking shift functions for invocation of G\(hyset to positions
 }
	2/1 to 7/14	10/1 to 15/14	2/1 to 7/14
_
.T&
cw(48p) | cw(60p) | cw(60p) | cw(60p) .
G0	LS0	\(em	\(em 
_
.T&
cw(48p) | cw(60p) | cw(60p) | cw(60p) .
G1	LS1	LS1R	\(em 
_
.T&
cw(48p) | cw(60p) | cw(60p) | cw(60p) .
G2	LS2	LS2R	SS2 
_
.T&
cw(48p) | cw(60p) | cw(60p) | cw(60p) .
G3	LS3	LS3R	SS3
_
.TE
.nr PS 9
.RT
.ad r
\fBTableau A\(hy1/T.61 [T4.61], p. 2\fR 
.sp 1P
.RT
.ad b
.RT
.ce
\fBH.T. [T5.61]\fR 
.ce
TABLE\ A\(hy2/T.61
.ce
\fBEscape sequence formats for designation of CCITT/ISO
.ce
registered graphic character set\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
cw(42p) | cw(60p) sw(60p) , ^  | c | c.
Graphic character set	 {
Escape sequence formats for designation of
 }
	single\(hybyte set	multiple\(hybyte set
_
.T&
cw(42p) | lw(60p) | lw(60p) .
G0	ESC 2/8 F	ESC 2/4 F 
_
.T&
cw(42p) | lw(60p) | lw(60p) .
G1	ESC 2/9 F	ESC 2/4 2/9 F 
_
.T&
cw(42p) | lw(60p) | lw(60p) .
G2	ESC 2/10 F	ESC 2/4 2/10 F\fR
_
.T&
cw(42p) | lw(60p) | lw(60p) .
G3	ESC 2/11 F	ESC 2/4 2/11 F
.TE
.LP
\fINote\ 1\fR
\ \(em\ The symbol F denotes final bit combination of an escape
sequence.
.LP
\fINote\ 2\fR
\ \(em\ The final characters F have to be provided by CCITT and
ISO.
.nr PS 9
.RT
.ad r
\fBTable A\(hy2/T.61 [T5.61], p.\fR 
.sp 1P
.RT
.ad b
.RT
.PP
A.7
For the designation of \fIDynamically redefinable character\fR 
\fIsets\fR (DRCS) the escape sequence formats shown in Table\ A\(hy3/T.61 are
used.
.sp 9p
.RT
.PP
A.8
Escape sequences for the designation of graphic character sets, and the 
associated shift functions for invoking these graphic sets, as well as 
the escape sequence for the designation and invocation of the control sets, 
may appear at any position within the text. 
.sp 9p
.RT
.PP
A.9
The final character F for the basic Teletex character sets
are:
.sp 9p
.RT
.LP
	\(em
	Primary control set
04/05
.LP
	\(em
	Supplementary control set
04/08
.LP
	\(em
	Primary graphic set
07/05
.LP
	\(em
	Supplementary graphic set
07/06
.bp
.LP
.ce
\fBH.T. [T6.61]\fR 
.ce
TABLE\ A\(hy3/T.61
.ce
\fBEscape sequence formats for designation of dynamically
.ce
\fB
.ce
redefinable character sets\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
cw(42p) | cw(60p) sw(60p) , ^  | c | c.
Graphic character set 	 {
Escape sequence formats for designation of 
 }
	single\(hybyte DRCS	multiple\(hybyte DRCS
_
.T&
cw(42p) | lw(60p) | lw(60p) .
G0	ESC 2/8 2/0 F	ESC 2/4 2/8 2/0 F
_
.T&
cw(42p) | lw(60p) | lw(60p) .
G1	ESC 2/9 2/0 F	ESC 2/4 2/9 2/0 F
_
.T&
cw(42p) | lw(60p) | lw(60p) .
G2	ESC 2/10 2/0 F	ESC 2/4 2/10 2/0 F
_
.T&
cw(42p) | lw(60p) | lw(60p) .
G3	ESC 2/11 2/0 F	ESC 2/4 2/11 2/0 F
.TE
.LP
\fINote\ 1\fR
\ \(em\ The final character F denotes the final bit combination of an
escape sequence.
.LP
\fINote\ 2\fR
\ \(em\ The character F should be in the range 4/0 to 7/14 and should
be assigned by the user. It is recommended that these final characters be
allocated sequentially starting with 4/0.
.nr PS 9
.RT
.ad r
\fBTableau A\(hy3/T.61 [T6.61], p. 4\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.sp 2
.ce 1000
ANNEX\ B
.ce 0
.ce 1000
(to Recommendation T.61)
.sp 9p
.RT
.ce 0
.ce 1000
\fBUse of diacritical marks\fR 
.sp 1P
.RT
.ce 0
.PP
B.1
The supplementary set contains 13 
diacritical marks
that are used in combination with the letters of the basic Latin alphabet in
the primary set to constitute the coded representations of accented letters 
and umlauts. These diacritical marks, and their coded representations, 
are: 
.sp 1P
.RT
.LP
	Acute accent
	12/2
.LP
	Grave accent
	12/1
.LP
	Circumflex accent
	12/3
.LP
	Diaeresis or umlaut mark
	12/8
.LP
	Tilde
	12/4
.LP
	Caron
	12/15
.LP
	Breve
	12/6
.LP
	Double acute accent
	12/13
.LP
	Ring
	12/10
.LP
	Dot
	12/7
.LP
	Macron
	12/5
.LP
	Cedilla
	12/11
.LP
	Ogonek
	12/14
.PP
\fINote\fR \ \(em\ In the 1980 version of this Recommendation code 12/9
was allocated to represent the umlaut mark. The use of this facility is
discouraged. Its removal is foreseen in the future.
.PP
B.2
Figure B\(hy1/T.61 specifies the combinations of diacritical
marks and basic letters that are defined in this Recommendation in its left
part and also indicates the special alphabetic characters used, in the right
part.
.bp
.sp 9p
.RT
.LP
.rs
.sp 47P
.ad r
\fBFig. B\(hy1/T.61 [T7.61], p.5 (\*`a traiter Tableau MEP)(ITALIENNE)\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce 1000
ANNEX\ C
.ce 0
.ce 1000
(to Recommendation T.61)
.sp 9p
.RT
.ce 0
.ce 1000
\fBIdentification system\fR 
.sp 1P
.RT
.ce 0
.PP
C.1
For the purpose of this Recommendation, a system was developed that allows 
for the identification and description of each graphic character or control 
function. The system is shown in Figure\ C\(hy1/T.61 
.sp 1P
.RT
.PP
C.2
Each identifier consists of two letters and two digits.
.sp 9p
.RT
.PP
C.3
The first letter indicates the alphabet, the language,\ etc.
.sp 9p
.RT
.PP
C.4
The second letter indicates the letter of an alphabet or, in
the case of a nonalphabetic graphic character or a control function, the 
group of characters or control functions. 
.sp 9p
.RT
.PP
C.5
The first digit indicates whether the letter in the second
position is an accented one, whether the diacritical mark is above or below 
the letter,\ etc. It has no special meaning in the case of the first letter 
being 
a\ C, N\ or\ S.
.sp 9p
.RT
.PP
C.6
The second digit indicates whether the letter is a capital or a small one 
(even or odd). If the first letter is a\ C, N or\ S, this digit being even 
or odd has no significance. 
.sp 9p
.RT
.PP
C.7
The numbering is used in a consistent manner so that each
diacritical mark is always given the same number.
.sp 9p
.RT
.PP
C.8
The numbering principle is shown in Table C\(hy1/T.61.
.sp 9p
.RT
.ce
\fBH.T. [T8.61]\fR 
.ce
TABLE\ C\(hy1/T.61
.ce
\fBNumbering principle for alphabetic characters\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
cw(72p) | cw(36p) | cw(36p) .
Item 	Small 	Capital 
_
.T&
lw(72p) | cw(36p) | cw(36p) .
No diacritical mark	01	02
.T&
lw(72p) | cw(36p) | cw(36p) .
Acute accent	11	12
.T&
lw(72p) | cw(36p) | cw(36p) .
Grave accent	13	14
.T&
lw(72p) | cw(36p) | cw(36p) .
Circumflex accent	15	16
.T&
lw(72p) | cw(36p) | cw(36p) .
Diaeresis or umlaut mark	17	18
.T&
lw(72p) | cw(36p) | cw(36p) .
Tilde	19	20
.T&
lw(72p) | cw(36p) | cw(36p) .
Caron	21	22
.T&
lw(72p) | cw(36p) | cw(36p) .
Breve	23	24
.T&
lw(72p) | cw(36p) | cw(36p) .
Double acute accent	25	26
.T&
lw(72p) | cw(36p) | cw(36p) .
Ring	27	28
.T&
lw(72p) | cw(36p) | cw(36p) .
Dot	29	30
.T&
lw(72p) | cw(36p) | cw(36p) .
Macron	31	32
.T&
lw(72p) | cw(36p) | cw(36p) .
Cedilla	41	42
.T&
lw(72p) | cw(36p) | cw(36p) .
Ogonek	43	44
.T&
lw(72p) | cw(36p) | cw(36p) .
Diphthong or ligature	51	52
.T&
lw(72p) | cw(36p) | cw(36p) .
Special form	61, 63, etc.	62, 64, etc.
.T&
lw(72p) | cw(36p) | cw(36p) .
Diaeresis with acute accent	33	\(em
_
.TE
.nr PS 9
.RT
.ad r
\fBTableau C\(hy1/T.61 [T8.61], p. 6\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.LP
.rs
.sp 47P
.ad r
\fBFigure C\(hy1/T.61, p. 7\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce 1000
ANNEX\ D
.ce 0
.ce 1000
(to Recommendation T.61)
.sp 9p
.RT
.ce 0
.ce 1000
\fBFormat of control sequences\fR 
.sp 1P
.RT
.ce 0
.PP
This annex is for information only and does not form part of the requirements 
laid down by this Recommendation; instead, it provides 
explanations of the format of control sequences. It consists of non\(hycontiguous 
extracts from the ISO Standard\ 6429. For ease of cross\(hyreference to 
that 
standard the original numbering scheme has been retained in preference to
allocating a new set of consistent paragraph numbers. To ensure accurate
interpretation of detailed meanings, reference should be made to ISO\ 6429.
.sp 1P
.RT
.PP
The double codings of parameters, intermediates and finals of a
control sequence, and the operand of a single\(hyshift character (as mentioned 
in Section 10 of the ISO extract) are not allowed in the Teletex service. 
In 
addition 7\(hybit coding is not relevant in the Teletex service.
.PP
\fIExtract from ISO Standard 6429:\fR 
.RT
.sp 1P
.LP
\*Q5.1.2
	\fIControl functions represented by control sequences\fR 
.sp 9p
.RT
.PP
A control sequence consists of CONTROL SEQUENCE INTRODUCER (CSI)
followed by one or more characters which identify the control function and,
if applicable, represent the parameters of the control function. The control
function\ CSI itself is an element of the\ C1 set.
.PP
The format of a control sequence shall be:
\v'6p'
.RT
.sp 1P
.ce 1000
CSI P\d1\u. |  |  P\dn\u\ I\d1\u. |  |  I\dm\u\ F
.ce 0
.sp 1P
.LP
.sp 1
where:
.LP
	a)
	CSI is represented by ESC 5/11 in a 7\(hybit code and by bit
combination 9/11 in an 8\(hybit code 
(see\ \(sc\ 5.2).
.LP
	b)
	P\d1\u. |  |  P\dn\ucorrespond to parameter values and are
represented by bit combinations of column\ 3; these bit
combinations are omitted if the control function has no parameter,
and may be omitted if the default parameter value is to apply.
.LP
	c)
	 I\d1\u. |  |  I\dm\uare Intermediate characters represented by bit combinations 
of column\ 2 which, together with the bit combination 
representing the Final character\ \fBF\fR , identify the control
function; these bit combinations are omitted if the control
function is identified only by the bit combination representing
the Final character\ F.
.LP
	\fINote\fR \ \(em\ The number of Intermediate characters is not limited by
this International Standard (ISO\ 6429); in practice, at the
most, one Intermediate character will be sufficient since over
one thousand control functions may be identified using not more
than one Intermediate character.
.LP
	d)
	F is the Final character; it is represented by a bit
combination of column\ 4, 5, 6 or\ 7 (except\ 7/15); it terminates
the control sequence and, together with the Intermediate characters,
if present, identifies the control function (however, see \(sc\ 10).
.PP
The occurrence of any bit combinations which do not conform to the above 
format is an error condition for which recovery is not specified by 
this International Standard (ISO\ 6429).
.PP
The Final characters (either used alone or together with Intermediate characters) 
are classified in two categories: 
.RT
.LP
	i)
	the control functions identified by a Final character
represented by a bit combination of columns\ 4, 5 and\ 6 are either
standardized or reserved for future standardization;
.LP
	ii)
	the control functions identified by a Final character
represented by a bit combination of column\ 7 (except\ 7/15) are not
standardized and are available for private (or experimental) use.
.PP
There are two types of parameters: numeric and selective (see
\(sc\ 5.4).
.PP
The bit combinations of columns\ 4, 5 and\ 6 representing the Final
characters and the bit combinations representing the Intermediate characters
are specified in Table\ 2 and Table\ 3.\*U
.bp
.RT
.sp 1P
.LP
\*Q5.4
	\fIParameter representations\fR 
.sp 9p
.RT
.PP
A control sequence may contain a string P\d1\u. |  |  P\dn\urepresenting 
one or more parameters to complete the specification 
of the control function.
.PP
The string of bit combinations representing P\d1\u. |  |  P\dn\ucontained 
in a control sequence is called the parameter string. It consists 
of bit combinations of column\ 3 and is interpreted as follows:
.RT
.LP
	\(em
	If the first bit combination of the parameter string
is in the range\ 3/0 to\ 3/11, the parameter string is interpreted
according to the format described below.
.LP
	\(em
	If the first bit combination of the parameter string is
in the range\ 3/12 to\ 3/15, the parameter string is available for private
(or experimental) use. Its format and meaning are not defined by this
International Standard (ISO\ 6429).
.sp 1P
.LP
5.4.1
	\fIParameter string format\fR 
.sp 9p
.RT
.PP
A parameter string shall have the following format:
.RT
.LP
	a)
	a parameter string consists of one or more parameter
sub\(hystrings;
.LP
	b)
	each parameter sub\(hystring consists of one or more bit
combinations from\ 3/0 to\ 3/9, representing the digits zero to nine;
.LP
	c)
	parameter sub\(hystrings are separated by one bit
combination\ 3/11;
.LP
	d)
	 bit combination 3/10 is reserved for future standardization as an additional 
parameter separator; 
.LP
	e)
	bit combinations 3/12 to 3/15 shall not be used;
.LP
	f
)
	 in each parameter sub\(hystring, leading bit combinations 3/0 are not 
significant and may be omitted; 
.LP
	g)
	if the parameter string starts with the bit combination
3/11, an empty parameter sub\(hystring is assumed preceding the separator;
if the parameter string terminates with the bit combination\ 3/11,
an empty parameter sub\(hystring is assumed following the separator;
if the parameter string contains successive bit combinations\ 3/11,
empty parameter sub\(hystrings are assumed between the separators;
.LP
	h)
	if the control function has more than one parameter,
and some parameter sub\(hystrings are empty, the separators
(bit combination\ 3/11) must still be present. However, if the
last parameter sub\(hystring(s) is empty, the separator preceding
it may be omitted (see Annex\ B\ \(em Coding examples);
.LP
	j)
	an empty parameter sub\(hystring or a parameter sub\(hystring
which consists of bit combinations\ 3/0 only represents a default
value which depends on the control function.
.sp 1P
.LP
5.4.2
	\fITypes of parameters\fR 
.sp 9p
.RT
.PP
In a control sequence representing a control function with
parameters, each parameter sub\(hystring corresponds to one parameter, and
represents the value of that parameter. The number of parameters is either
fixed of variable, depending on the control function. If the number of
parameters is variable, neither the maximum number of values nor the order
in which the corresponding actions are performed are defined by this
International Standard (ISO\ 6429).
.RT
.sp 1P
.LP
5.4.2.1
	\fINumeric parameters\fR 
.sp 9p
.RT
.PP
In a control sequence representing a control function with numeric parameters, 
each parameter sub\(hystring which has a value other than a zero 
represents a quantity in decimal notation.
.RT
.sp 1P
.LP
5.4.2.2
	\fISelective parameters\fR 
.sp 9p
.RT
.PP
In a control sequence representing a control function with
selective parameters, each parameter sub\(hystring whilst expressed by digits,
is not quantitative i.e. does not represent a quantity in decimal notation.
Each value corresponds to one of the actions the control function can perform.
.PP
A particular parameter value may have the same meaning as a
combination of two or more separate values.\*U
.bp
.RT
.sp 2P
.LP
\*Q10
	\fITransformation between 7\(hybit and 8\(hybit coded representations\fR 
.sp 1P
.RT
.PP
The control functions defined in this International Standard
(ISO 6429) can be coded in a 7\(hybit code as well as in an 8\(hybit code: both
forms of coded representation are equivalent and in accordance with ISO\ 2022.
.PP
However, when data containing these control functions are transformed from 
a 7\(hybit to an 8\(hybit representation or vice versa, the transformation 
algorithm specified in ISO\ 2022 may produce results which are formally in
disagreement with this International Standard (ISO\ 6429).
.PP
In order to make allowance for such unintended but unavoidable
deviations, the format rules are extended in the manner described below.
.PP
In an 8\(hybit code, the bit combination of columns 10 to 15 (except 10/0 
and 15/15) are permitted to represent: 
.RT
.LP
	a)
	parameters, intermediates and finals of a control sequence;
.LP
	b)
	the contents of a control string;
.LP
	c)
	the operand of a single\(hyshift character.
.PP
In these situations, the bit combinations in the range 10/1 to
15/14 have the same meanings as the corresponding bit combination in the
range\ 2/1 to\ 7/14.\*U
.ce 1000
ANNEX\ E
.ce 0
.ce 1000
(to Recommendation T.61)
.sp 9p
.RT
.ce 0
.ce 1000
\fBStandardized options\fR 
.sp 1P
.RT
.ce 0
.LP
E.1
	\fIGeneral\fR 
.sp 1P
.RT
.PP
E.1.1
This annex contains detailed definitions that shall be used to implement 
Teletex standardized options included in the Teletex repertoire of 
graphic characters and control functions.
.sp 9p
.RT
.sp 2P
.LP
E.2
	\fIDefinitions\fR 
.sp 1P
.RT
.PP
E.2.1
The definitions contained in \(sc\ 2 shall apply unless explicitly  amended.
.sp 9p
.RT
.PP
E.2.2
Additional definitions are for further study.
.LP
E.3
	\fITeletex character repertoire\fR 
.sp 1P
.RT
.sp 2P
.LP
E.3.1
	\fITeletex optional repertoire of graphic characters\fR 
.sp 1P
.RT
.sp 1P
.LP
E.3.1.1
	\fIRegistered character sets\fR \v'3p'
.sp 9p
.RT
.LP
E.3.1.1.1\ \ Japanese Kanji terminal optional graphic character
repertoire.
.PP
Japanese graphic character set for information interchange
(JIS\ C\ 6226\(hy1983
.FS
Japanese Industrial Standard.
.FE
) used as a G0
set.
.sp 1P
.LP
E.3.1.1.2\ \ Chinese ideogram terminal optional graphic character repertoire.
.sp 9p
.RT
.PP
Chinese graphic character set for information interchange
(GB\ 2312\(hy80 set No.\ 58 in ISO Register) used as a G1\ set.
.sp 2P
.LP
E.3.1.1.3\ \ 
\fIGreek primary set of graphic characters\fR 
.sp 1P
.RT
.sp 1P
.LP
E.3.1.1.3.1\ \ The code table of the Greek set, shown in Figure\ E\(hy1/T.61,
consists of the most frequently used Greek alphanumeric characters and
punctuation marks. The bit combination\ 02/00 is used for SPACE and\ 07/15 is
used for DELETE.
.bp
.sp 9p
.RT
.LP
.rs
.sp 47P
.ad r
\fBFigure E\(hy1/T.61, p. 8\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.sp 1P
.LP
E.3.1.1.3.2\ \ \fIGreek alphabetic characters\fR 
.sp 9p
.RT
.ce
\fBH.T. [1T9.61]\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
cw(18p) | cw(30p) | cw(120p) | cw(18p) | cw(42p) .
ID	Graphic	Name\ or\ description	Set	Position  
_
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GA01	\(*a	small letter Alpha	G0	6/1\ 
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GA02	A	capital letter Alpha	G0	4/1\ 
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GA11	\(*\*'a	 {
small letter Alpha with accent
 }	G2	4/2\ \ \ G0 6/1\ 
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GA12	\o"A\(aa"	 {
capital letter Alpha with\ accent
 }	G2\fR	4/2\ \ \ G0 4/1\ 
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GB01	\(*b	small letter Beta	G0	6/2\ 
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GB02	B	capital letter Beta	G0	4/2\ 
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GG01	\(*g	small letter Gamma	G0	6/3\ 
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GG02	\(*G	capital letter Gamma	G0	4/3\ 
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GD01	\(*d	small letter Delta	G0	6/4\ 
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GD02	\(*D	capital letter Delta	G0	4/4\ 
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GE01	\(*e"	small letter Epsilon	G0	6/5\ 
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GE02	E	capital letter Epsilon	G0	4/5\ 
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GE11	\*'\(*e 	 {
small letter Epsilon with accent
 }	G2	4/2\ \ \ G0 6/5\ 
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GE12	\o"E\(aa"	 {
capital letter Epsilon with accent
 }	G2	4/2\ \ \ G0 4/5\ 
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GZ01	\(*z	small letter Zeta	G0	6/6\ 
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GZ02	Z	capital letter Zeta	G0	4/6\ 
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GE61	\(*y	small letter Eta	G0	6/7\ 
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GE62	H	capital letter Eta	G0	4/7\ 
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GE63	\(*y 	small letter Eta with accent	G2	4/2\ \ \ G0 6/7\ 
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GE64	\(*Y 	 {
capital letter Eta with accent
 }	G2	4/2\ \ \ G0 4/7\ 
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GT61	\(*h	small letter Theta	G0	6/8\ 
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GT62	\(*H	capital letter Theta	G0	4/8\ 
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GI01	\(*i	small letter Iota	G0	6/9\ 
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GI02	I	capital letter Iota	G0	4/9\ 
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GI11	\(*\*'i	small letter Iota with accent	G2	4/2\ \ \ G0 6/9\ 
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GI12	\o"I\(aa"	 {
capital letter Iota with accent
 }	G2	4/2\ \ \ G0 4/9\ 
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GI17	\(*\*:i	 {
small letter Iota with diaeresis
 }	G2	4/8\ \ \ G0 6/9\ 
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GI18	\*:I	 {
capital letter Iota with diaeresis
 }	G2	4/8\ \ \ G0 4/9\ 
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GI33	\(*\*:\*'i	 {
small letter Iota with accent and diaeresis
 }	G2	4/0\ \ \ G0 6/9\ 
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GK01	\(*k	small letter Kappa	G0	6/10
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GK02	K	capital letter Kappa	G0	4/10
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GL01	\(*l	small letter Lambda	G0	6/11
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GL02	\(*L	capital letter Lambda	G0	4/11
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GM01	\(*m	small letter Mu	G0	6/12
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GM02	M	capital letter Mu	G0	4/12
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GN01	\(*n	small letter Nu	G0	6/13
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GN02	N	capital letter Nu	G0	4/13
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GX01	\(*c	small letter Xi	G0	6/14
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GX02	\(*C	capital letter Xi	G0	4/14
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GO01	o	small letter Omicron	G0	6/15
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GO02	O	capital letter Omicron	G0	4/15
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GO11	\*'o	 {
small letter Omicron with accent
 }	G2	4/2\ \ \ G0 6/15
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GO12	\o"O\(aa"	 {
capital letter Omicron with accent
 }	G2	4/2\ \ \ G0 4/15
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GP01	\(*p	small letter Pi	G0	7/0\ 
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GP02	\(*P	capital letter Pi	G0	5/0\ 
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GR01	\(*r"	small letter Rho	G0	7/1\ 
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GR02	P	capital letter Rho	G0	5/1\ 
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GS01	\(*s	small letter Sigma	G0	7/3\ 
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GS02	\(*s"	capital letter Sigma	G0	5/3\ 
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GS03	s	small letter final Sigma	G0	7/2\ 
_
.TE
.nr PS 9
.RT
.ad r
\fBTableau [1T9.61], p. 9\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [2T9.61]\fR 
.ce

.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
cw(18p) | cw(30p) | cw(120p) | cw(18p) | cw(42p) .
ID	Graphic	Name\ or\ description	Set	Position  
_
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GT01	\(*t	small letter Tau	G0	7/4\ 
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GT02	T	capital letter Tau	G0	5/4\ 
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GY01	\(*u	small letter Upsilon	G0	7/5\ 
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GY02	Y	capital letter Upsilon	G0	5/5\ 
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GY11	\(*\*'u	 {
small letter Upsilon with accent
 }	\(*U	4/2\ \ \ G0 7/5\ 
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GY12	\(*uY 	 {
capital letter Upsilon with accent
 }	G2	4/2\ \ \ G0 5/5\ 
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GY17	\(*\*:u	 {
small letter Upsilon with diaeresis
 }	G2	4/8\ \ \ G0 7/5\ 
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GY18	Y	 {
capital letter Upsilon with diaeresis
 }	G2	4/8\ \ \ G0 5/5\ 
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GY33	\(*\*:\*'u	 {
small letter Upsilon with accent and diaeresis
 }	G2	4/0\ \ \ G0 7/5\ 
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GF01	\(*f	small letter Phi	G0	7/6\ 
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GF02	\(*F	capital letter Phi	G0	5/6\ 
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GH01	\(*x	small letter Khi	G0	7/7\ 
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GH02	\(*X	capital letter Khi	G0	5/7\ 
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GP61	\(*q	small letter Psi	G0	7/8\ 
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GP62	i\(*Q	capital letter Psi	G0	5/8\ 
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GO61	\(*w	small letter Omega	G0	7/9\ 
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GO62	\(*W	capital letter Omega	G0	5/9\ 
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GO63	\(*w 	 {
small letter Omega with accent
 }	G2	4/2\ \ \ G0 7/9\ 
.T&
lw(18p) | cw(30p) | lw(120p) | lw(18p) | lw(42p) .
GO64	\(*W 	 {
capital letter Omega with accent
 }	G2	4/2\ \ \ G0 5/9\ 
_
.TE
.nr PS 9
.RT
.ad r
\fBTableau [2T9.61], p. 10\fR 
.sp 1P
.RT
.ad b
.RT
.PP
Coded representations of letters with diacritical marks are
constituted of letter codes from the Greek primary set in combination with
diacritical marks codes from positions\ 12/00 to\ 12/15 of the supplementary 
set (Figure\ 2/T.61 code table). 
.PP
Bit combination equivalent to empty position\ 12/00 of the
supplementary set in Figure\ 2/T.61 code table is used to represent the
diacritical mark \*QDiaeresis with acute accent\*U. (Identification\ SD33, 
graphic symbol\ .`.) 
that shall be transmitted in the Greek Teletex service.
.RT
.sp 1P
.LP
E.3.1.1.3.3\ \ Figure E\(hy2/T.61 specifies the possible combinations of
diacritical marks from the supplementary set and letters of the Greek primary 
set that are defined in this Recommendation. 
.sp 9p
.RT
.sp 1P
.LP
E.3.1.1.4\ \ The use of additional sets is for further study.
.sp 9p
.RT
.LP
.rs
.sp 16P
.ad r
\fBFigure E\(hy2/T.61 [T10.61], p.\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.sp 1P
.LP
E.3.1.2
	\fIDynamically redefinable character sets (DRCS)\fR 
.sp 9p
.RT
.PP
DRCS will be used by Japanese Kanji terminal and Chinese ideogram terminal 
to extend their character repertoire. Japanese Kanji character 
patterns and Chinese ideogram character patterns will be loaded into a 
terminal by procedures described in Recommendation\ T.62, and shall be 
designated and 
invoked as described in Annex\ A of this Recommendation.
.PP
A definition for \fBDRCS\fR is as follows:
.PP
A DRCS is a set of graphic characters whose exact shape is specified and 
transmitted at the time of use. Such characters may be alphabetic, special 
symbols or picture element symbols. Once loaded, a DRCS is regarded as 
a member of a library that can be designated by appropriate ESC sequences 
as a G0, G1, G2 or G3 set. 
.PP
ESC I 2/0 F designates such a set, where I will take a value
from 2/8\ . |  | \ 2/11 to indicate whether the set is to be used as a G0, G1,
G2 or G3 set respectively.
.PP
Sixty\(hythree sets may be identified by means of such four character
sequences.
This should be enough for most requirements but a third or more intermediate
character can be inserted between the 2/0\ character and the final character
if more sets are needed. See ISO Standard\ 2022.
.PP
Sequences with 2/0 as the second intermediate character and with 2/0 to 
2/7 as the first Intermediate character are reserved for future 
standardization.
.PP
Multiple\(hybyte graphic sets may also be dynamically redefinable.
ECS\ 2/4\ I\ 2/0\ F designate such a set when it is to be a G1, G2 or G3 
set, where I takes the same value and has the same meaning as in the preceding 
paragraphs. However, when such a set is to be a G0 set, it shall be
designated by ESC\ 2/4\ 2/0\ F.
.PP
\fINote\ 1\fR \ \(em\ This class of escape sequence is exceptional because the
allocation of final (and possible intermediate) character is not done
by the ISO Registration Authority but by the user. It is recommended that
final characters be allocated sequentially, starting with\ 4/0.
.PP
\fINote\ 2\fR \ \(em\ There is a need for this particular escape sequence as
distinct from the normal three character sequence used to represent registered 
sets. This escape sequence implies an exact description of the shape or 
font of the characters. 
.RT
.sp 1P
.LP
E.3.2
	\fITeletex optional repertoire of control functions\fR 
.sp 9p
.RT
.PP
\fINote\fR \ \(em\ For the definition of optional control functions and 
the associated optional parameter values, the appropriate ISO standard 
should be 
considered.
.RT
.sp 2P
.LP
E.3.2.1
	\fIFormat effectors\fR 
.sp 1P
.RT
.sp 1P
.LP
\ Identifier
\ Abbreviation
	Name and definition
	CF20
	RLF
	\fIReverse line feed\fR 
.sp 9p
.RT
.LP
	A format effector that moves the
active position to the corresponding character
position on the preceding line, defined by the
current value of the vertical spacing (see SVS).
.LP
	 \fINote\fR \ \(em\ In order to use RLF, it is first necessary to negotiate 
the use of an optional supplementary control character set containing RLF 
(in addition to those characters shown in Figure\ 3/T.61 using the control
procedures of Recommendation\ T.62. Designation and invocation of this
control character set may appear at any position in the text. For further
details see Annex\ A.
.bp
.LP
	The escape sequence for this control set is ESC 2/2 F.
.LP
	This control set was not assigned an escape sequence \fIFinal\fR 
bit combination during the 1981\(hy84 Study period since no identifiable 
use for RLF could be found. The need for RLF is for further study. 
.sp 2P
.LP
E.3.2.2
	\fIPresentation control functions\fR 
.sp 1P
.RT
.sp 1P
.LP
\ Identifier
\ Abbreviation
	Name and definition
	CP01
	PFS
	\fIPage format selection\fR 
.sp 9p
.RT
.LP
(Definition: see \(sc 3.3.3)
.LP
	The meaning of the parameter value is:
.LP
As defined for the basic Teletex service.
.FE
	\ 0:
	vertical basic page format
;
.LP
	\ 1:
	horizontal basic page format
;
.LP
	\ 2:
	vertical A4 page format;
.LP
	\ 3:
	horizontal A4 page format;
.LP
	\ 4:
	reserved for future option;
.LP
	\ 5:
	reserved for future option;
.LP
	\ 6:
	vertical ISO 3535/A4 page format;
.LP
	\ 7:
	horizontal ISO 3535/A4 page format;
.LP
	\ 8:
	vertical North American legal size page format;
.LP
	\ 9:
	horizontal North American legal size page format;
.LP
	10:
	vertical ISO A4 page format (for use by
Chinese ideogram and Japanese Kanji terminals);
.LP
	11:
	horizontal ISO A4 page format (for use by
Chinese ideogram and Japanese Kanji terminals);
.LP
	12:
	vertical ISO B5 page format (for use by
Chinese ideogram and Japanese Kanji terminals);
.LP
	13:
	horizontal ISO B5 page format (for use by Chinese
ideogram and Japanese Kanji terminals);
.LP
	14:
	vertical ISO B4 page format (for use by
Chinese ideogram and Japanese Kanji terminals);
.LP
	15:
	horizontal ISO B4 page format (for use by
Chinese ideogram and Japanese Kanji terminals);
.LP
	CP03
	SGR
	\fISelect graphic rendition\fR 
.LP
(Definition: see \(sc 3.3.3)
.LP
	The meaning of the parameter value is:
.LP
	\ 0:
	default rendition
; cancels the effect of any preceding
occurrence of SGR; if no parameter is present, the default parameter value
applies;
.LP
	\ 1:
	bold or increased intensity;
.LP
	\ 3:
	italicized;
.LP
	\ 4:
	underlined
;
.bp
.LP
	\ 9:
	crossed\(hyout (characters still legible but marked as being
deleted);
.LP
	22:
	normal intensity (not bold);
.LP
	23:
	not italicized;
.LP
	24:
	not underlined;
.LP
	26:
	proportional spacing character pitch may be
used. See Note\ 1 below. When proportional
spacing character pitch is invoked, the
parameter value of the SHS function shall
specify the nominal character pitch;
.LP
	29:
	not crossed\(hyout.
.LP
	 \fINote\ 1\fR \ \(em\ Parameter value 26 specifies that the text that 
follows may be presented with proportional spacing at the recipient's option. 
For 
interworking with devices not capable of proportional spacing, no line 
or part of a line of text should contain more characters than are permitted 
by the 
current pitch value specified by the most recent occurrence of\ SHS.
.LP
	 \fINote\ 2\fR \ \(em\ Parameters shall be separated by bit combination\ 
3/11. See Annex\ D, \(sc\ 5.4.1. 
.LP
	\fINote\ 3\fR \ \(em\ A terminal's capability to support proportional
spacing
shall be indicated by including an SGR sequence, with parameter value 26
only, in the Recommendation\ T.62 procedure for exchanging non\(hybasic 
terminal 
capabilities.
.LP
	 \fINote\ 4\fR \ \(em\ Several parameter values can be used in combination, 
in order to obtain, for example, underlined italics. 
.LP
	\fINote\ 5\fR \ \(em\ The default parameter value cannot be used in
combination with any other parameter value.
.LP
	CP04
	SHS
	\fISelect horizontal spacing\fR 
.LP
(Definition: see \(sc\ 3.3.3)
.LP
	The meaning of the parameter value is:
.LP
	\ 0:
	10 characters per 25.4 mm;
.LP
	\ 1:
	12 characters per 25.4 mm;
.LP
	\ 2:
	15 characters per 25.4 mm;
.LP
	\ 3:
	\ 6 characters per 25.4 mm;
.LP
	\ 4:
	\ 3 characters per 25.4 mm;
.LP
	\ 5:
	\ 9 characters per 50.8 mm;
.LP
	\ 6:
	\ 4 characters per 25.4 mm.
.LP
	 \fINote\ 1\fR \ \(em\ Parameter value 3 may only be used with page formats 
specified by PFS parameter values 10 to\ 15. 
.LP
	\fINote\ 2\fR \ \(em\ Parameter values 5 and 6 may only be used with page
formats specified by PFS parameter values\ 10 to\ 15 for Chinese ideogram
terminal.
.bp
.LP
	CP05
	SVS
	\fISelect vertical spacing\fR 
.LP
(Definition: see \(sc\ 3.3.3)
.LP
	The meaning of the parameter value is:
.LP
	\ 0:
	\ 6 lines per 25.4 mm
;
.LP
	\ 1:
	\ 4 lines per 25.4 mm
;
.LP
	\ 2:
	\ 3 lines per 25.4 mm
;
.LP
	\ 3:
	12 lines per 25.4 mm
;
.LP
	\ 4:
	\ 8 lines per 25.4 mm;
.LP
	\ 5:
	\ 6 lines per 30.0 mm;
.LP
	\ 6:
	\ 4 lines per 30.0 mm;
.LP
	\ 7:
	\ 3 lines per 30.0 mm;
.LP
	\ 8:
	12 lines per 30.0 mm.
.LP
	CP06
	SPD
	\fISelect presentation direction\fR 
.LP
	A presentation control function with one selective parameter
which specifies the character path and line progression, until these directions 
are respecified by another occurrence of SPD. 
.LP
	The meaning of the parameter value is as follows:
.LP
	\ 0:
	character path from left to right, line
progression from top to bottom;
.LP
	\ 1:
	character path from top to bottom, line
progression from right to left when page is
orientated for viewing. See Table\ E\(hy1/T.61.
.LP
	The default value of the parameter is 0.
.LP
	\fINote\ 1\fR \ \(em\ An occurrence of SPD is only effective at the
beginning of a page, i.e. SPD has no effect in the middle of a page.
.LP
	\fINote\ 2\fR \ \(em\ Some Japanese and Chinese characters use different
patterns for vertical writing from those used for horizontal writing.
Table\ E\(hy2/T.61 and Table\ E\(hy3/T.61 show the difference between horizontal 
and 
vertical writing character patterns.
.LP
	\fINote\ 3\fR \ \(em\ The perceived effects of SPD on the other control
function are shown in Table\ E\(hy4/T.61.
.LP
	\fINote\ 4\fR \ \(em\ Figure\ E\(hy3/T.61 shows an example of a page format
using PFS parameter values\ 10, 12 and\ 14, with SPD parameter values\ 
0 and\ 1. 
.LP
	\fINote\ 5\fR \ \(em\ SPD may only be used with page formats specified by
PFS parameter values 10 to\ 15.
.LP
	CP07
	GSM
	\fIGraphic size modification\fR 
.LP
	GSM is a presentation control function with two numeric
parameters. Its use causes the height and/or width of the character font 
to be modified until a subsequent occurrence of GSM in the data stream, 
or a page 
boundary is reached.
.LP
	The meaning of the parameter values are:
.LP
	\fIn\fR  | 
	 specifies the character dimension in the direction of the line progression 
as a percentage of the default font size. 
.bp
.LP
	\fIm\fR  | 
	 specifies the character dimension in the direction of the character path 
as a percentage of the default font size. 
.LP
	The order of the parameters is GSM (\fIn\fR , \fIm\fR ) and the default
value of \fIn\fR and \fIm\fR is\ 100. Permitted values of parameters\ n 
and\ m, and the 
effect that these values have on the character spacing (as specified by SHS)
and size, are as follows.
.LP
	For horizontal writing (SPD 0):
.LP
	GSM 100, 50 causes character spacing and width to be halved.
.LP
GSM 100, 100 has no effect.
.LP
GSM 100, 200 causes character spacing and width to be doubled.
.LP
	For vertical writing (SPD 1):
.LP
	GSM 100, 100 has no effect.
.LP
GSM 100, 200 causes character spacing and height to be
doubled.
.LP
	 \fINote\ 1\fR \ \(em\ GSM affects only those characters which follow 
it in the data stream, not those previously received. 
.LP
	\fINote\ 2\fR \ \(em\ GSM may only be used with page formats specified by
PFS parameter values 10 to\ 15.
.LP
	CP08
	SCO
	\fISelect character orientation\fR 
.LP
	SCO is a presentation control function which is used to establish the
amount of rotation of the following graphic character string. The
established value remains in effect until the next occurrence of SCO.
.LP
	The parameter values are:
.LP
	0:
	\ \ 0\(de
.LP
	2:
	\ 90\(de
.LP
	6:
	270\(de
.LP
	The default value of the parameter is 0.
.LP
	 The initial position of the graphic characters corresponds to the rotation 
angle of\ 0\(de. 
.LP
	Rotation is positive, i.e. anti\(hyclockwise and applies to the normal
presentation of the graphic characters along the character path. The direction 
of the character path depends on the parameter of SELECT PRESENTATION 
DIRECTIONS (SPD).
.LP
	 \fINote\fR \ \(em\ For Chinese ideogram terminals, the center of character 
rotation is the center of the character cell. 
.ce
\fBH.T. [T11.61]\fR 
.ce
TABLE\ E\(hy1/T.61
.ce
\fBIntended viewing orientation of a page\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
cw(60p) | cw(60p) sw(60p) , ^  | c | c.
 {
Page format select parameter value
 }	 {
Intended viewing orientation of page with SPD
parameter values
 }
	0	1
_
.T&
cw(60p) | cw(60p) | cw(60p) .
10, 12, 14	portrait	landscape
_
.T&
cw(60p) | cw(60p) | cw(60p) .
11, 13, 15	landscape	portrait
_
.TE
.nr PS 9
.RT
.ad r
\fBTABLEAU E\(hy1/T.61 [T11.61], p. 12\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.LP
.rs
.sp 47P
.ad r
\fBTABLEAU E\(hy2/T.61, p. 13\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.LP
.rs
.sp 47P
.ad r
\fBTABLEAU E\(hy3/T.61, p. 14\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.LP
.rs
.sp 47P
.ad r
\fBTABLEAU E\(hy4/T.61, p. 15\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.LP
.rs
.sp 26P
.ad r
\fBFIGURE E\(hy3/T.61, p. 16\fR 
.sp 1P
.RT
.ad b
.RT
.sp 2P
.LP
E.3.2.3
	\fICode extension control functions\fR 
.sp 1P
.RT
.sp 1P
.LP
\ Identifier
\ Abbreviation
	Name and definition
	CE03
	ESC
	\fIEscape\fR 
.sp 9p
.RT
.LP
	A code extension control function which is used to
provide coded representations for additional control
functions.
.LP
	CE04
	SS2
	\fISingle shift 2\fR 
.LP
	A code extension control function which is used in
conjunction with ESCAPE to extend the graphic character set of
an 8\(hybit code.
.LP
	SS2 is a non\(hylocking shift function which invokes one
character of the currently designated G2\ set.
.LP
	CE05
	SS3
	\fISingle shift 3\fR 
.LP
	A code extension control function which is used in
conjunction with ESCAPE to extend the graphic character set of
an 8\(hybit code.
.LP
	SS3 is a non\(hylocking shift function which invokes one
character of the currently designated G3 set.
.LP
	CE07
	LS0
	\fILocking shift 0\fR 
.LP
	A code extension control function which is used in
conjunction with other locking shift functions and with ESCAPE
to extend the graphic character set of an 8\(hybit code.
.LP
	LS0 is a locking shift function which invokes the
currently designated G0 set into positions\ 2/1
to\ 7/14.
.bp
.LP
	CE08
	LS1
	\fILocking shift 1\fR 
.LP
	A code extension control function which is used in
conjunction with other locking shift functions and with ESCAPE
to extend the graphic character set of an 8\(hybit code.
.LP
	LS1 is a locking shift function which invokes the
currently designated G1 set into positions\ 2/1 to\ 7/14.
.LP
	CE09
	LS1R
	\fILocking shift 1 right\fR 
.LP
	A code extension control function which is used in
conjunction with other locking shift functions and with ESCAPE
to extend the graphic character set of an 8\(hybit code.
.LP
	LS1R is a locking shift function which invokes the
currently designated G1 set into position\ 10/1 to\ 15/14.
.LP
	CE10
	LS2
	\fILocking shift 2\fR 
.LP
	A code extension control function which is used in
conjunction with other locking shift functions and with ESCAPE
to extend the graphic character set of an 8\(hybit code.
.LP
	LS2 is a locking shift function which invokes the
currently designated G2 set into positions\ 2/1 to\ 7/14.
.LP
	CE11
	LS2R
	\fILocking shift 2 right\fR 
.LP
	A code extension control function which is used in
conjunction with other locking shift functions and with ESCAPE
to extend the graphic character set of an 8\(hybit code.
.LP
	LS2R is a locking shift function which invokes the
currently designated G2 set into positions\ 10/1 to\ 15/14.
.LP
	CE12
	LS3
	\fILocking shift 3\fR 
.LP
	A code extension control function which is used in
conjunction with other locking shift functions and with ESCAPE
to extend the graphic character set of an 8\(hybit code.
.LP
	LS3 is a locking shift function which invokes the
currently designated G3 set into positions\ 2/1 to\ 7/14.
.LP
	CE13
	LS3R
	\fILocking shift 3 right\fR 
.LP
	A code extension control function which is used in
conjunction with other locking shift functions and with ESCAPE
to extend the graphic character set of an 8\(hybit code.
.LP
	LS3R is a locking shift function which invokes the
currently designated G3 set into positions\ 10/1 to\ 15/14.
.sp 2P
.LP
E.3.2.4
	\fIOptional miscellaneous control function\fR 
.sp 1P
.RT
.sp 1P
.LP
\ Identifier
\ Abbreviation
	Name and description
	CM04
	IGS
	\fIIdentify graphic subrepertoire\fR 
.sp 9p
.RT
.LP
	A control function with one selective parameter which is
used to indicate to the receiving terminal that a particular
subrepertoire of the total repertoire of graphic characters is
to be used in the subsequent text. The identification of the
graphic subrepertoire may be changed at any point in the text.
The selection parameter may be of any value from 0\(hy9999.
.LP
	The parameter value identifies the subrepertoire
according to the register of subrepertoires. The subrepertoire
that is assumed to be identified when this control function is
omitted is the entire Teletex basic repertoire of graphic
characters.
.LP
	If any subrepertoire has been explicitly identified, it
shall be restated prior to the first character of text on each
subsequent page (i.e. prior to Form Feed).
.bp
.LP
E.4
	\fICoded representations\fR 
.sp 1P
.RT
.sp 2P
.LP
E.4.1
	\fIOptional graphic character sets\fR 
.sp 1P
.RT
.sp 1P
.LP
E.4.1.1
	\fIRegistered character sets\fR \v'3p'
.sp 9p
.RT
.LP
E.4.1.1.1\ \ Japanese graphic character set for information interchange
(set No.\ 87 in ISO Register) used as a G0\ set.
.PP
Designation sequence: ESC 2/4 4/2.
.sp 1P
.LP
E.4.1.1.2\ \ Chinese graphic character set for information interchange (set
No.\ 58 in ISO Register) used as a G1\ set.
.sp 9p
.RT
.PP
Designation sequence: ESC 02/04 02/09 04/01.
.sp 1P
.LP
E.4.1.1.3\ \ 
\fIGreek primary set of graphic characters\fR 
.sp 9p
.RT
.PP
Designation sequences:
.RT
.LP
	ECS 02/08 x/x Greek primary set to G0
.LP
ECS 02/09 x/x Greek primary set to G1
.LP
ECS 02/10 x/x Greek primary set to G2
.LP
ECS 02/11 x/x Greek primary set to G3
.PP
\fINote\fR \ \(em\ The final character x/x is awaiting international
registration.
.sp 1P
.LP
E.4.1.2
	\fIDynamically redefinable character sets (DRCS)\fR 
.sp 9p
.RT
.PP
Designation sequence: see Annex\ A.
.RT
.LP
E.4.2
	\fIOptional control functions\fR 
.sp 1P
.RT
.sp 2P
.LP
E.4.2.1
	\fIFormat effectors\fR 
.sp 1P
.RT
.sp 1P
.LP
\ Identifier
\ Abbreviation
	Coded representation
	CF20
	RLF
	\ \ \ \ \ 8/13
.sp 9p
.RT
.sp 2P
.LP
E.4.2.2
	\fIPresentation control functions\fR 
.sp 1P
.RT
.sp 1P
.LP
\ Identifier
\ Abbreviation
	Coded representation
.sp 9p
.RT
.LP
	CP06
	SPD
	CSI P\d1\u. |  |  P\dn\u02/00 05/03
.LP
	CP07
	GSM
	CSI P\d1\u. |  |  P\dn\u02/00 04/02
.LP
	CP08
	SCO
	CSI P\d1\u. |  |  P\dn\u02/00 06/05
.PP
Additional control functions are for further study.
.sp 2P
.LP
E.4.2.3
	\fIOptional code extension control functions\fR 
.sp 1P
.RT
.sp 1P
.LP
\ Identifier
\ Abbreviation
	Coded representation
	CE03
	ESC
	\ \ \ \ \ 1/11
.sp 9p
.RT
.LP
	CE04
	SS2
	\ \ \ \ \ 1/9
.LP
	CE05
	SS3
	\ \ \ \ \ 1/13
.LP
	CE07
	LS0
	\ \ \ \ \ 0/15
.LP
	CE08
	LS1
	\ \ \ \ \ 0/14
.LP
	CE10
	LS2
	\ \ \ \ \ 1/11 6/14
.LP
	CE12
	LS3
	\ \ \ \ \ 1/11 6/15
.LP
	CE09
	LS1R
	\ \ \ \ \ 1/11 7/14
.LP
	CE11
	LS2R
	\ \ \ \ \ 1/11 7/13
.LP
	CE13
	LS3R
	\ \ \ \ \ 1/11 7/12
.bp
.sp 2P
.LP
E.4.2.4
	\fIOptional miscellaneous control function\fR 
.sp 1P
.RT
.sp 1P
.LP
\ Identifier
\ Abbreviation
	Coded representation
	CM04
	IGS
	CSI P\d1\u. |  |  \fIP\fR\d\fIn\fR\u02/00 04/13
\v'1P'
.sp 9p
.RT
.ce 1000
ANNEX\ F
.ce 0
.ce 1000
(to Recommendation T.61)
.sp 9p
.RT
.ce 0
.ce 1000
\fBExample of underlining\fR 
.sp 1P
.RT
.ce 0
.PP
The following examples demonstrate the presentation of
permissible combinations of underline and other characters of the basic 
Teletex repertoire. They also demonstrate the interaction between underline 
(coded 
as either a \fINon\(hyspacing underline\fR character or as the control function
\fISelect graphic rendition\fR ) and the control functions PLU and\ PLD.
.sp 1P
.RT
.sp 1P
.LP
\fIExample\ 1\fR :
.sp 9p
.RT
.PP
a b SGR(4) c d PLU e f PLD PLD g h PLU i j SGR k l
\v'6p'
.LP
yields:
\ ab
cd
ef
gh
ij
kl\ (See
Notes 1 and 2 below.)
.sp 1P
.LP
.sp 1
\fIExample\ 2\fR :
.sp 9p
.RT
.PP
a b SGR(4) c d SGR(0) PLU SGR(4) e f SGR(0) PLD k l
\v'6p'
.LP
yields:\ ab
cd
ef
kl
.sp 1P
.LP
.sp 1
\fIExample\ 3\fR :
.sp 9p
.RT
.PP
a b SGR(4) c d PLU SGR(4) e f SGR(0) PLD k l
\v'6p'
.LP
yields:\ ab
cd
ef
kl
.sp 1P
.LP
.sp 1
\fIExample\ 4\fR :
.sp 9p
.RT
.PP
a b \d\\u(em c \d\\u(em d \d\\u(em PLU e PLD \d\\u(em PLD g PLU \d\\u(em 
i \d\\u(em j k l 
\v'6p'
.LP
yields:
\ ab
cd
e
g
ij
kl\ (See
Note 1 below.)
.sp 1P
.LP
.sp 1
\fIExample\ 5\fR :
.sp 9p
.RT
.PP
a b \d\\u(em c \d\\u(em d PLU \d\\u(em e \d\\u(em f  PLD k l
\v'6p'
.LP
yields:\ ab
cd
ef
kl
.LP
.sp 1
.PP
\fINote\ 1\fR \ \(em\ See \(sc\ 3.1.7 for guidance on the presentation of
underline in situations where a possibility of overlap exists.
.PP
\fINote\ 2\fR \ \(em\ This example also demonstrates the use of an SGR 
without a parameter value. 
.RT
.LP
.rs
.sp 6P
.LP
.bp