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Hardware Configuration

The first step in attaching a modem to a router is to install the hardware. The main concerns are which

cables to use and why or why not to use the console port for a modem.

Cabling Issues

It is important to connect the modem to the router before configuring the modem to verify that

communication between them is established. If the cabling is incorrect, the rest of the process will fail.

As a rule, external modems are built with a female data communications equipment (DCE) DB-25 port for

connection to a controlling device such as a PC or a router. The following table will help you select the

appropriate cables to make the connection between the router and the modem. The table also includes

information on the required cabling and the types of physical ports on Cisco routers to which a modem can

be connected.

Router

Port

Examples

of where

found

Cabling Required

DB-25

DTE

Male DB-25

AUX on the

Cisco 4000,

7000, 7200,

and 7500.

Straight-through DB-25F --

DB25M RS-232 cable.

DB-25

DCE

Female

DB-25

console port

on the Cisco

4000 and

7000 series.

Null-modem DB-25M --

DB25M RS232 cable. A rolled

RJ-45--RJ-45 with

CAB-25AS-MMOD adapters

on both ends will work.

DB-60 Sync/async

interfaces.

Cisco 1005,

1600s, and

2500s;

network

modules on

the Cisco

2600, 3600,

and 4000.

Cisco-specific cable, the

CAB-232MT(=).

RJ-45 AUX or

CON on the

Cisco

2500s,

2600, 3600,

AS5200,

and

AS5300.

Rolled RJ-45--RJ-45 cable

with adapter marked

"MODEM" (part number

CAB-25AS-MMOD).

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