This page provides instructions on how to connect modems and terminals to the

• Eight async ports on the 2509-RJ
• Sixteen async ports on the 2511-RJ

These ports are RS-232 ports with female RJ-45 connectors.

The 2500-RJ access servers ship with one male DB-25 modem cable for each async port . These will connect to modems with female DB-25 connectors. For all other modem and terminal situations, read the details on this page.

Warning! There is no standard for RS-232 on RJ-45. Therefore, the RJ-45 async port cables must be obtained from Cisco or built to accommodate the async port pinouts.

Warning! The details below speak of a rolled cable. An RS-232 rolled cable is not the same as an Ethernet crossover cable! The product catalog describes the differences between the RJ-45 cables.

Warning! These instructions do not apply to the 2509-2511 octal cables. For details on the octal cables, go to Octal Cables for the 2500 Access Servers.

Connecting an Async Port to a Modem

Modems with Female DB-25 Connectors
The 2500-RJ access servers come with eight (2509-RJ) or sixteen (2511-RJ) male DB-25 modem cables. These cables connect to modems with female DB-25 connectors.

Initially, these cables will actually be an RJ-45 to RJ-45 rolled cable with an RJ-45 to DB-25 adapter. However, in the future, a single piece molded cable may replace the two-piece cable.

Spares for the two-piece cable are orderable through Cisco as

• Rolled cable, 14 ft., CAB-500RJ, $25
• RJ-45 to DB-25 adapter (male DCE), CAB-25AS-MMOD, $25

Spares for the one-piece molded cables are orderable through Cisco as tbd.

Modems with Female DB-9 Connectors
Add a standard DB-25 (female) to DB-9 (male) adapter to the DB-25 modem cables that ship with the access server. Cisco does not sell a DB-25 to DB-9 adapter, but these are readily available for under $15.

Async port --- rolled cable --- CAB-25AS-MMOD --- DB-25 to DB-9 adapter --- modem

Modems with Female RJ-45 Connectors
Contact your SE. Give him the name and model number of the modem and, if possible, get the pinouts of the modem connector from the customer.

If the modem is the Microcom ISPorte, here's how to connect to it.

Async port --- rolled cable --- coupler --- Microcom cable --- ISPorte port

The rolled cable is available from Cisco as CAB-500RJ (14 foot; $25). Off the shelf rolled cables can be used instead of the Cisco rolled cable.

The coupler and Microcom cable are available together in sets of four as Microcom part # 1953066. The Microcom cable length is 4 feet.

Other Modem Connectors
See your SE. Give him the type of connector, the name and model number of the modem, and, if possible, get the pinouts of the modem connector from the customer.

Connecting an Async Port to a Terminal

Terminals with Male DB-25 Connectors
Cisco does not include female DTE cables with the 2500-RJ access servers, but we do sell a two-piece cable as

• Rolled cable, 14 ft., CAB-500RJ, $25
• RJ-45 to DB-25 adapter (female DTE), CAB-25AS-FDTE, $25

Terminals with Male DB-9 Connectors
Add a standard DB-25 (male) to DB-9 (female) adapter to the two-piece cable above. Cisco does not sell a DB-25 to DB-9 adapter, but these are readily available for under $15.

Async port --- rolled cable --- CAB-25AS-FDTE --- DB-25 to DB-9 adapter --- terminal

Other Terminal Connectors
See your SE. Give him the type of connector, the name and model number of the terminal, and, if possible, get the pinouts of the terminal connector from the customer.

Pinouts for the 2500-RJ Async Ports

Pictures

Connecting a Modem (Female DB-25 connector) to the Async Port

CAB-500RJ
Rolled, 14 foot, RJ-45 cable

CAB-25AS-MMOD
RJ-45 to DB-25 male DCE adapter

CAB-25AS-FDTE
RJ-45 to DB-25 female DTE adapter