Specifications

Configuring and Managing Integrated Modems
Managing Modems
DC-76
Cisco IOS Dial Technologies Configuration Guide
Changing Configurations Manually in Integrated Microcom Modems
You can change the running configuration of an integrated modem by sending individual modem AT
commands. Manageable Microcom modems have an out-of-band feature, which is used to poll modem
statistics and send AT commands. The Cisco IOS software uses a direct connect session to transfer
information through this out-of-band feature. To send AT commands to a Microcom modem, you must
permit a direct connect session for a specified modem, open a direct connect session, send AT commands
to a modem, and clear the directly connected session from the modem when you are finished.
Open a direct connect session by entering the modem at-mode slot/port command in privileged EXEC
mode. From here, you can send AT commands directly from your terminal session window to the internal
Microcom modems. Most incoming or outgoing calls on the modems are not interrupted when you open
a direct connect session and send AT commands. However, some AT commands interrupt a call—for
example, the ATH command, which hangs up a call. Open and close one direct connect session at a time.
Note that multiple open sessions slow down modem performance.
Refer to the AT command set that came with your router for a complete list of AT commands that you
can send to the modems.
For Microcom modems, you can clear or terminate an active directly connected session in two ways:
• Press Ctrl-C after sending all AT commands as instructed by the system when you enter AT
command mode.
• Enter a second Telnet session and execute the clear modem at-mode slot/port EXEC command.
This method is used for closing a directly connected session that may have been mistakenly left open
by the first Telnet session.
The following example illustrates use of the modem commands.
AT Mode Example for Integrated Modems
To establish a direct connect session to an internal or integrated modem (existing inside the router), such
as the connection required for Microcom modems in the Cisco AS5200 access server, open a directly
connected session with the modem at-mode command and then send an AT command to the specified
modem. For example, the following example sends the AT command at%v to modem 1/1:
AS5200# modem at-mode 1/1
You are now entering AT command mode on modem (slot 1 / port 1).
Please type CTRL-C to exit AT command mode.
at%v
MNP Class 10 V.34/V.FC Modem Rev 1.0/85
OK
at\s
IDLE 000:00:00
LAST DIAL
NET ADDR: FFFFFFFFFFFF
MODEM HW: SA 2W United States
4 RTS 5 CTS 6 DSR - CD 20 DTR - RI
MODULATION IDLE
MODEM BPS 28800 AT%G0
MODEM FLOW OFF AT\G0
MODEM MODE AUT AT\N3
V.23 OPR. OFF AT%F0
AUTO ANS. ON ATS0=1
SERIAL BPS 115200 AT%U0
BPS ADJUST OFF AT\J0