Cisco 3825 Hardware Installation Guide - Page 160

Digital Network Modem Network Modules Overview Chapter 9 Connecting Digital Modem Network 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. Hardware and Software Requirements In addition to the digital modem module, the router must contain a PRI or BRI network interface to connect to the ISDN channel, and another interface, such as Ethernet or Fast Ethernet, to provide connectivity to the LAN. A PRI network module (NM-1CT1, NM-2CT1, NM-1CT1-CSU, NM-2CT1-CSU, NM-1CE1B, NM-2CE1B, NM-1CE1U, or NM-2CE1U) used with a digital modem module must be revision level -03 or higher. A BRI S/T network module (NM-4B-S/T or NM-8B-S/T) must be revision level -03 or higher, and a BRI U module (NM-4B-U or NM-8B-U) must be revision level -06 or higher. Earlier revisions of these network modules cannot send modem calls to the digital modem module. If the PRI or BRI module is the wrong revision, you see a message similar to this one when the router boots: The T1 or E1 network module in slot 0 is incompatible with the digital modems installed in the router. To determine the revision level, you can examine the network module itself (outside the router), or use the Cisco IOS show diag command. The label on the module board should show a part number beginning with 800- and ending with the revision level. The output of the show diag command looks similar to the following: Slot 3: Port adapter is analyzed Port adapter insertion time unknown Hardware revision 1.0 Board revision A0 Serial number 4152626 Part number 800-01228-01 Test history 0x0 RMA number 00-00-00 EEPROM format version 1 EEPROM contents (hex): 0x20: 01 26 01 00 00 3F 5D 32 50 04 CC 01 00 00 00 00 0x30: 50 00 00 00 96 11 04 17 FF FF FF FF FF FF FF FF To order network module upgrades, see the "Obtaining Technical Assistance" section on page xi. Interface Numbering Individual digital modem ports are not physically distinct, but Cisco IOS software identifies each modem uniquely through its slot number and port number. Slot numbering is explained in the "Network Module Slot Locations and Numbering on Cisco Access Routers" section on page 1-3. Each digital modem module can hold up to five banks of MICA modules, numbered 0 to 4 from left to right (as viewed from the rear of the router). Each MICA module holds six modems, which are assigned modem numbers 0 to 5. Cisco Network Modules Hardware Installation Guide 9-2 OL-2485-20