B-6 APPENDIX B: AT COMMANDS, REGISTERS, AND RESULT CODES

Table B-2 AT Command Set Summary for the Internal Analog Modem (continued)

Command

Function (Example)

Description

 

 

 

\N

Set preferred error-correcting

0 — Normal speed buffered

 

mode to be negotiated in a

1

— Direct

 

subsequent data connection

 

2

— Reliable link

 

 

 

 

3

— Auto reliable

 

 

4

— Force LAPM

 

 

5

— Force MNP

-K

MNP extended services

Enables/disables conversion of a V.42

 

 

LAPM connection to an MNP 10

 

 

connection.

 

 

0

— Disable

 

 

1

— Enable

 

 

2

— Enable; inhibits MNP extended

 

 

services initiation during V.42 LAPM

 

 

answer mode detection phase

-Q

MNP 10 fallback to 2400 bps

Enables or disables fallback from MNP 10

 

(V.22bis)/1200 (V.22)

to V.22bis/V.22.

 

 

0

— Disable

 

 

1

— Enable (default)

*H

Link negotiation speed

Controls the connection speed for link

 

 

negotiations before upshift occurs

 

 

between two MNP Class 10 modems.

 

 

0

— Highest rate (default)

 

 

1

— 1200 bps

 

 

2

— 4800 bps

+F

All fax commands (AT+fax sub-

All fax commands

 

command)

 

 

 

 

 

 

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3Com DIGITAL MODEM Normal speed buffered, Mode to be negotiated in a Direct, Reliable link, Auto reliable, Force Lapm

DIGITAL MODEM specifications

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