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ITU-T V.22 BIS

1988 Edition, November 1, 1988

Complete Document

2400 BITS PER SECOND DUPLEX MODEM USING THE FREQUENCY DIVISION TECHNIQUE STANDARDIZED FOR USE ON THE GENERAL SWITCHED TELEPHONE NETWORK AND ON POINT-TO-POINT 2-WIRE LEASED TELEPHONE-TYPE CIRCUITS



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Description / Abstract:

Introduction

These modems are intended for use on connections on the GSTN and on point-to-point 2-wire leased telephonetype circuits (see Note). The principal characteristics of these modems are as follows:

a) duplex mode of operation on the GSTN and point-to-point leased circuits,

b) channel separation by frequency division,

c) quadrature amplitude modulation for each channel with synchronous line transmission at 600 baud (nominal),

d) inclusion of a scrambler,

e) inclusion of an adaptive equalizer and a compromise equalizer,

f) inclusion of test facilities,

g) data signalling rates of:

2400 bit/s synchronous,

2400 bit/s start-stop,

1200 bit/s synchronous,

1200 bit/s start-stop,

h) it is compatible with a V.22 modem operating in Modes i) or ii) at the 1200 bit/s signalling rate and includes automatic bit rate recognition.

Note - In certain countries the use of such modems over the GSTN may not be allowed.