Cisco 2600 Series Operation Manual page 104

Figure 10-1 Digital Modem Network Module
DIGITAL MODEMS
MICA MICA MICA MICA MICA
EN
BANK 0 BANK 1 BANK 2 BANK 3 BANK 4
Digital modem network modules do not provide network interfaces of their own, but
instead handle analog calls passing through other router interfaces. In addition to the digital
modem module, the router must contain a PRI or BRI network module to connect to the
ISDN channel, and another module, such as Ethernet, to provide connectivity to the LAN.
The PRI or BRI module concurrently handles digital ISDN data connections and remote
voice-channel (analog) modem connections, allowing a dynamic mix of digital and modem
connections. The digital modem module acts as a pool of available modems that can be
used for both incoming and outgoing calls.
Digital modem network modules require Cisco IOS Release 11.2(9)XA or
Caution
11.2(10)P or later. The PRI module must be hardware revision -03; the BRI S/T module
must be hardware revision -03, and the BRI U module must be hardware revision -06.
Earlier revisions of these network modules are incompatible with digital modem modules.
The digital modems support all standard data rates from 300 bps through 33.6 kbps
(V.34 bis); V.42 bis and MNP 5 data compression; and V.42, LAPM, and MNP 4 error
correction.
Each digital modem module contains from one to five banks of 6-port modem ISDN
channel aggregation (MICA) modules. You can add modems to a module, in groups of six,
by installing additional MICA modules (Cisco product number MICA-6MOD=), up to a
maximum of 30 modems.
10-2 Cisco Network Modules Hardware Installation Guide