How to Connect Two Cisco Routers Back-to-Back With T1 CSU/DSU

Written by george garza
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How to Connect Two Cisco Routers Back-to-Back With T1 CSU/DSU
Cisco routers can connect different networks together and operate at different speeds. (cable modem image by IKO from Fotolia.com)

The Cisco Router is a networking device that allows access to different networks. You can think of a router like a traffic light; it just directs traffic. The router, in this case, directs network traffic. Routers can operate at different speeds, which make them valuable for ISP (Internet Service Providers). One of the speeds that is very much in demand is the TI line speed, which can operate at 1.544 mega bits per second. This is necessary to send traffic to different networks and also to provide speedy upload and download operations.

Skill level:
Moderate

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Instructions

  1. 1

    Attach one end of an RJ-48C cable to Router 1 and the other end to Router 2. The cable must be a crossover cable because you are attaching two similar devices together. Go to Router 1.

  2. 2

    Type "en" to enable the router for configuration. Type "config t." This is the configuration mode where you can make changes to the router program. You will make a configuration change to Router 1 with the "internal" command and one on Router 2 with the "line" command.

  3. 3

    Type "interface serial 0." (Do not include the period.) This will configure the serial 0 interface. Next type "service-module t1 clock source internal." (Do not include the period.) Type "Exit." Then type "Copy Run-Start." This will save the configuration to the router. Now go to Router 2 to complete the configuration.

  4. 4

    Type "interface serial 0." (Do not include the period.) This will configure the serial 0 interface. Next type "service-module t1 clock source line." (Do not include the period.) Type "Exit." Then type "Copy Run-Start." This will save the configuration to the router.

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