Specifications

Configuring and Managing Integrated Modems
Managing Modems
DC-77
Cisco IOS Dial Technologies Configuration Guide
SPT BPS ADJ. 0 AT\W0
ANSWER MESSGS ON ATQ0
SERIAL FLOW BHW AT\Q3
PASS XON/XOFF OFF AT\X0
PARITY 8N AT
The modem responds with “OK” when the AT command you send is received.
Configuring Leased-Line Support for Analog Modems
Analog modems on the NM-8AM and NM-16AM network modules in the Cisco 2600 and 3600 series
routers provide two-wire leased-line support for enterprise customers who require point-to-point
connections between locations and for enterprise customers with medium to high data transfer
requirements without access to other technologies or with access to only low-grade phone lines.
This feature works only with leased lines that provide loop current. Each modem used must have an
RJ-11 connection to the PSTN.
Several features enhance the analog modem software:
• 2-wire leased-line support.
• Modem speeds up to 33.6 kbps with support for all current analog modem protocols, compression,
and error correction techniques.
• Power-on autoconnect and loopback testing.
• Support for the maximum number of leased-line users without data transmission loss at distances up
to 2 to 5 km.
• In-band and out-of-band monitoring.
• Support on all Cisco 2600 and Cisco 3600 series platforms and upgradability using Cisco IOS
software.
• Compatibility with other major leased-line modem vendors.
To configure this support, configure one modem AT command (AT & L) and two AT registers with the
modemcap entry command for the appropriate leased lines.
For leased line configuration using the AT& L {0 | 1 | 2}command:
• 0—Disables the leased line (enables switched line; default).
• 1—Enables the leased line. The modem initiates a leased line when dial and answer commands
(ATD and ATA) are issued.
• 2—Enables the leased line. The modem goes off hook automatically after T57 number of seconds in:
– Originate mode if ATS0 is 0.
– Answer mode if ATS0 is not equal to 0.
The following AT registers can also be set:
• AT:T57—Number of seconds before going off hook in leased-line mode when the command
AT&L2 is used (defaults to 6).
• AT:T79—Number of autoretrains before the modem is disconnected (defaults to 3).
For more information about using the AT command set with the modems on the NM-8AM and
NM-16AM network modules in the Cisco 2600 and 3600 series routers, search Cisco.com for the
publication AT Command Set and Register Summary for Analog Modem Network Modules.