ITU-T V.22 BIS
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
| Organization: | ITU-T |
| Publication Date: | 1 November 1988 |
| Status: | active |
| Page Count: | 18 |
scope:
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.
Document History
