Chapter 6: Modem Guide

Bell 103 Protocol

Bell 103 protocol is for 300 bps full-duplex connections. The features described in this guide apply to Bell 103 operation except that your modem does not support:

Digital (loop 1A) and analog (V.54 loop 3) loopback.

LAPM connections.

NOTE

When your modem establishes a reliable Bell 103 connection, it displays CONNECT 103/REL - MNP. For a normal or direct Bell 103 connection, the message is CONNECT.

6.4.1Protocol Configuration Command Settings

When you send an AT string to the modem, it adjusts modem-port speed automatically to match the AT speed. Use %G1 to disable this feature. With %G1 set, you can change the modem speed with %Bn (where n is the new modem speed) and %Fn.

This section lists settings to configure the modem for each mode and protocol. Modem connection speeds are in parentheses.

Table 6-3 Configuring the Modem with %F0 Set

Protocol

Issue %G0:

Issue %G1:

 

 

 

 

V.21

(75-300 bps)

B0 at 300 bps

B0%B300

 

 

 

Bell 103 (75-300 bps)

B1 at 300 bps

B1%B300

 

 

 

 

V.22

(600 bps)

at 600 bps

%B600

 

 

 

 

V.22

(1200 bps)

B0 at 1200 bps

B0%B1200

 

 

 

Bell 212A (1200 bps)

B1 at 1200 bps

B1%B1200

 

 

 

V.34/V.22bis (2400 bps)

at 2400 bps

%B2400

 

 

 

V.34/V.32bis/V.32 (4800 bps)

at 4800 bps

%B4800

 

 

 

V.34/V.32bis (7200 bps)

at 7200 bps

%B7200

 

 

 

V.34/V.32bis/V.32 (9600 bps)

at 9600 bps

%B9600

 

 

 

V.34/V.32bis (12000 bps)

at 12000 bps

%B12000

 

 

 

 

6-10

CSMIM-T1 Hardware Installation Guide

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Cabletron Systems CSMIM-T1 manual Protocol Configuration Command Settings, Protocol Issue %G0 Issue %G1