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Fascicle VII.3 - Rec. T.4
4.3 Extended two-dimensional coding scheme
The basic facsimile coding scheme specified in S 2.2 of Recommendation T.6
may be used as an option in Group 3 facsimile. This coding scheme is limited to
the use of the Error Correction Mode specified in S 3.3.
4.4 Error limiting mode
One-dimensional coding scheme with the division of scan line into parts.
The one-dimensional coding scheme with the division of scan line into
parts is an optional extension of the one-dimensional coding scheme specified in
Annex B.
5 Modulation and demodulation
Group 3 apparatus operating on the general switched telephone network
shall utilize the modulation, scambler, equalization and timing signals defined
in Recommendation V.27 ter, specifically SS 2, 3, 7, 8, 9, 11 and the Appendix.
5.1 The training signal to be used shall be the long training sequence with
protection against talker echo (see Recommendation V.27 ter, S 2.5.1, Table
3/V.27 ter).
5.2 The data signalling rates to be used are 4800 bit/s and 2400 bit/s as
defined in Recommendation V.27 ter.
Note 1
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