rixride

Is it a T1 or a PRI?

Do you have a loop back plug?

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m_steeler

Thanks for the reply. It's just a T1. I was going to do a loop back test but by the time I got around to it I noticed the red light on the smart jack was out and the T1 was back up. The problem was at the CO. Thanks

PP

Suggestion, Make Yourself A Loopback Plug And A Loopback Jack. All You Do Is Take Pins 1,2 And Loop Them To 4,5.
Also Your Csu Should Have A Manual Loopback Which You Can Throw To Prove It Good To That Point, The Loopback Plug Or Jack Is To Check It To The Smartjack. Your Responsible For The Portion To The Smartjack Also

telecom116

You should also know how to read and interpret the LED indicators on the telco smartjack. Many times these are also helpful to trace down where the problems are occuring. As in a case this morning, after a storm at a remote branch, it was easy to have the on-site staff look at the smartjack and tell me there were no lights on in the jack, meaning that there was no connection to the CO. It also helps when reporting the issue to the first-line dweebs at telco and you can tell them the NIU is dark and dead. (PS, in my case it was a nice little lighting strike - blew the NIU card, CSU/DSU, couple of ports on a 9150, the alarm system, POTS phone attached to the alarm line, and the fax machine).

Fletch

A couple of things to remember.

RED ALRM is a local alarm. It means there is no signal present at the T1 card in the PBX. Most likely the problem is towards the CO. A loopback plug will confirm this. If you plug in the Loopback, and the system goes out of RED, then there is problem with the circuit.

YELLOW ALARM - A lot of folks get this wrong. It is a RECIEVED ALARM. Just by the fact that you are getting it, means you see the other side. What it is telling you though, is that the far side does NOT see you and they are sending a YELLOW to let you know that.

T1 (Non PRI) - If you loop these back, the channels will go idle and you WILL TRY TO SEND CALLS! be careful when looping back during business hours when this T1 is still a possible route choice.

T1 (PRI) - Looping these back will only bring the T1 in service. The DCH will not establish, since it is seeing itself, and one side has to be master and one side has to be slave. Looping a PRI causes the DCH to see a Slave to Slave, or Master to Master DCH connection, and it will not bring the channels into idle.

As Rix suggested, always have a loopback plug handy for each side of each interface you have, as well as all of the possible gender configurations.

these are easy to make, and a life saver!