Bn - Communications Options

Command Line Format
AT [cmds] B[suffix] [cmds] <CR>

Suffix Values
See list below

Default
N/A

Stored by &Wn
yes

Displayed by &V
yes

Description
This command allows simultaneous selection of more than one n suffix; however, there are groups of n values and only the last n chosen from a group is in effect within that group.

The B command is used to select the communication standard for data calls. The value of suffix n defines the desired communications standard setting at a particular modem line speed.

B Command Descriptions:
B0 - ITU-T V.22 when line speed is 1200 bits/s.

B1 - Industry Standard 212A when line speed is 1200 bits/s.

B2 - V.23 originate: T75/R1200 when DTE speed is 1200 bits/s. V.23 answer: T75/R1200 when DTE speed is 1200 bits/s.

B3 - V.23 originate: T1200/R75 when DTE speed is 1200 bits/s.

V.23 answer: T1200/R75 when DTE speed is 1200 bits/s.

B4 p; V.23 T1200/R75 bits/s split speed when line speed is at T1200/R75 bits/s.

B5 p; V.23 1200 bits/s half duplex when line speed is at T1200/R1200 bits/s.

B6 - V.26bis when line speed is 1200 bits/s (HDX).

B10 -V.23 R1200/T75 bits/s split speed when line speed is at R1200/T75 bits/s.

B11 - V.23 R600/T75 bits/s split speed when line speed is at R600/T75 bits/s.

B15 - V.21 when line speed is 300 bits/s.

B16 - Industry Standard 103 when line speed is 300 bits/s.

B20 - V.23 R600/T75 bits/s ASB when line speed is T600/R600 bits/s.

B21 - V.23 T600/R75 bits/s ASB when line speed is T600/R600 bits/s.

B22 - V.23 T600/R75 bits/s split speed when line speed is T600/R75 bits/s.

B23 - V.23 600, half duplex when line speed is 600 bits/s.

B30 - V.22 bis when preferred line speed is 2400 bits/s.

B32 - V.26 bis when preferred line speed is 2400 bits/s (HDX).

B33 - V.34 when preferred line speed is 2400 bits/s.

B41 - V.32 when preferred line speed is 4800 bits/s.

B42 - Express 96 (TM) when preferred line speed is 4800 bits/s.

B43 - Industry Standard 208 when preferred line speed is 4800 bits/s (HDX).

B44 - V.34 when preferred line speed is 4800 bits/s.

B52 - V.32 bis when preferred line speed is 7200 bits/s.

B53 - V.34 when preferred line speed is 7200 bits/s.

B60 - V.32 when preferred line speed is 9600 bits/s.

B61 - Express96 when preferred line speed is 9600 bits/s.

B64 - V.FC when preferred line speed is 9600 bits/s.

B65 - V.34 when preferred line speed is 9600 bits/s.

B70 - V.32 bis when preferred line speed is 12000 bits/s.

B71 - V.FC when preferred line speed is at 12000 bits/s.

B72 - V.34 when preferred line speed is at 12000 bits/s.

B75 - V.32 bis when preferred line speed is at 14400 bits/s.

B76 - V.FC when preferred line speed is at 14400 bits/s.

B77 - V.34 when preferred line speed is at 14400 bits/s.

B80 - V.34 when preferred line speed is 16800 - 28800 bits/s.

B81 - V.FC when preferred line speed is 16800-28800 bits/s.

B82 - Reserved for V.terbo when preferred line speed is 16800 - 19200 bits/s.

B83 - V.34 and V.FC are enabled if preferred line speed is 16800 - 28800 bits/s. The N0 command permits V.34 or V.FC.

Note: Express 96 (TM) is a Hayes proprietary protocol that simulates full-duplex 9600 bits/s operation (formerly known as Hayes fast-turnaround &quotPing-Pong"protocol).

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