Specifications

Configuring and Managing Integrated Modems
Modems and Modem Feature Support
DC-63
Cisco IOS Dial Technologies Configuration Guide
Note If the platform is using MICA technologies modems, the V.120 rate adaptation is done by CPU on
vty lines like protocol translation sessions.
The following sections summarize the standards supported by modems in the Cisco access servers. See
Table 7 through Table 10 for a summary and comparison of the Cisco IOS commands used for the MICA
and NextPort modems.
V.90 Modem Standard
Study Group 16 of the International Telecommunication Union Telecommunication Standardization
Sector (ITU-T) developed the V.90 modem standard for multimedia systems. The V.90 standard
describes a digital modem and analog modem pair for use on the public switched telephone network
(PSTN). V.90 modems are designed for connections that are digital at one end and have only one
digital-to-analog conversion. The V.90 standard is expected to be widely used for applications such as
Internet and online service access. Download speeds of up to 56,000 bits per second (bps) are possible,
depending on telephone line conditions, with upload speeds of up to 33,600 bps.
V.110 Bit Rate Adaption Standard
V.110 is a bit rate adaptation standard defined by the ITU that provides a standard method of
encapsulating data over global system for mobile telecommunication (GSM) and ISDN networks. V.110
allows for reliable transport of asynchronous or synchronous data. V.110 adapts a low-speed connection
Table 6 Cisco IOS Modems and Modem Feature Support
Device Support Cisco AS5300 Cisco AS5350 Cisco AS5400 Cisco AS5800
Cisco 2600/3600
Series Routers
Integrated
modems
6- and 12-port
MICA
60-port
NextPort CSM
v6DFC
108-port
NextPort CSM
v6DFC
72- and
144-port MICA
324-port
NextPort CSM
v6DFC
6-port, 12-port,
18-port,
24-port, or
30-port MICA
NM-DM
8- and 16-port
analog
NM-AM
V.90 Yes Yes Yes Yes Yes with
NM-DM
V.110 Yes Yes Yes Yes Yes with
NM-DM
V.120 No, CPU only Yes Yes Yes with
324-port
NextPort
1
CSM
v6DFC
1. For more detailed information regarding the V.120 functionalities that are supported both by NextPort and Cisco IOS
software, see the section “V.120 Bit Rate Adaptation Standard.”
No, CPU only