telco can loop either your CSU or the smartjack remotely by sending standardized binary patterns to them. Also, if you have a telco technician who is not very good, you can set your own loopbacks manually by either of the following methods:
On the router with an internal CSU/DSU: Router(config)#controller t1 0 Router(config-controller)#loopback local see: http://www.cisco.com/warp/customer/471/hard_loopback.html (you can also set a "DTE loop" manually on external CSU/DSUs to check if your V.35 cable going to your router is bad or not.) or what is called a "hard loop" where you do one of the following at the T1 wall jack: if it is an RJ48X it will have a spring in the female RJ48 T1 jack so all you have to do is pull out your patch cable and the TX pair will spring into a loop with the RX pair. or if you have crimpers, you can make a hard loop cable from 4 inches of cat5 & one RJ45 end by connecting the following wires: 1--->4 2--->5 and plug the loop into the T1 wall jack. This is really good for proving to the LEC that they failed to deliver a good extended dmarc all the way to the end, etc. Good luck. Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=25112&t=24972 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
