Cabletron Systems CSMIM-T1 Installation Manual page 111

V.22 and V.22bis Protocols
V.22 protocol is used for 1200 bps and 600 bps full-duplex connections.
The version of V.22 your modem supports is Alternative B.
V.22bis protocol enhances V.22 by adding 2400 bps full-duplex
connections.
For V.22 at 600 bps, both modems must be set to 600 bps.
NOTE
V.21 Protocol
V.21 protocol is used for 300 bps full-duplex connections. The features
described in this manual apply to V.21 operation except that your modem
does not support:
• V.54 digital and analog loopback.
• LAPM connections.
When your modem establishes a V.21 connection, it displays
NOTE
CONNECT V.21/REL - MNP. With a normal or direct V.21
connection, the message is CONNECT.
Bell 212A Protocol
Bell 212A protocol is for 1200 bps full-duplex connections.
CSMIM-T1 Hardware Installation Guide
Modulation Protocols
6-9