The digital modem network modules significantly enhance the dial access
flexibility and scalability of the Cisco 3600 platform series. Each network
module supports up to 30 digital modems. The digital modem network modules use
either the single or dual T1/E1 network modules to offer support for up to 60
remote modem users (using two NM-DM network modules), at speeds up to 56 Kbps.
There are no specific requirements for this document.
The information in this document is based on digital modem network
modules using either the single or dual T1/E1 network modules.
The information in this document was created from the devices in a
specific lab environment. All of the devices used in this document started with
a cleared (default) configuration. If your network is live, make sure that you
understand the potential impact of any command.
Field upgraded in increments of six using MICA-6MOD= (same as 6DM=).
Uses the same MICA modems as AS5300 (Note: cannot
use the 12 port module).
Takes analog data calls from T1s, E1s, and Integrated Services
Digital Network (ISDN) Basic Rate Interfaces (BRIs) (from BRI network modules,
not BRI WAN interface cards [WICs]) and routes them to the modems.
Cisco IOS Versions 11.2(9)XA, 11.2(10)P, 11.3(2)T, and all
Cisco IOS Versions 12.0(7)XK, 12.1T, 12.2, and
All Cisco IOS software versions
Note: NM-DM modules are not supported in Cisco IOS Version 12.0 on the
Cisco 3620. You must use Cisco IOS Version 12.0T or later.
On-line Insertion and Removal (hot swap) requires Cisco IOS Version
12.1(1)T (supported only on 3660 and 3700 platforms).
On the digital modem network modules, the interfaces are addressed as
interface async (line number).
Older versions of Cisco IOS software reserved 16 async line numbers per
network module slot. However, when the NM-16A, NM-32A, or digital modems are
installed in the Cisco 3600 series, Cisco IOS software will reserve 32 line
numbers per slot. This will cause a problem if the NM-16A, NM-32A, or digital
modems are installed into a system that already has an async configuration
based on 16 line numbers per slot. The aux port will now be line 65 on the
Cisco 3620 and line 129 on the Cisco 3640. Use the show
line command to check the line numbering on the chassis.