How to begin to troubleshoot CPE customer indicating circuit down

[leonardo.paskell]

What are the steps required to find out where the problem is or is not when troubleshooting.

Explanin testing of customer circuit, equipment, interfaces, routes, csu/dsu etc.

Thank you for any suggestions.

[mmellet]

Here are some steps and some urls that should help.

1. check physical equipment and cabling.

2. check configuration of equipment.

3. use a loopback plug to check T1 and Frame circuits.

http://www.cisco.com/warp/public/116/t1_flchrt_main.html

http://www.cisco.com/warp/public/471/hard_loopback.htm