Hi Lewis. I tried this with a LoopBack adapter that came with our Equinox Digital Modem Pools we used to have. When I initiate the Loopback test by setting the mode from NoLoop to Payload or Line, the LoopBack LED goes Yellow (test in progress) but it never comes back from yellow. Can you explain how the sequence should look? Perhaps the lookback adaptor I have is not the same - I haven't built my own yet, but will tomorrow. Actually, I think the T1 port is OK - at least the CAR light comes on green and the PairGain HDLS T1 modem's lights activate correspondingly, just that we get a dead-air answer. We've been though the trunk settings over and over, but I just don't see anything wrong. We get the same results on both cards, so we're back to trying a loopback to make sure the CAR lights aren't lying. So, if you could tell me what a successful loopback test should work like, I would be grateful. :-) Todd Chamberlain ----- Original Message ----- From: "Lewis Bergman" <lbergman@abi.tconline.net> To: <usr-tc@mailman.xmission.com> Sent: Tuesday, September 03, 2002 2:49 PM Subject: Re: [USR-TC] HELP: Lightning HiPerDSP
If you just want to check if the circuitry is OK on the DSP you should do a loopback test. You can also make a loopback adapter by crossing the pairs. Do a google search for "t1 loopback" and you'll see the pinout. -- Lewis Bergman Texas Communications 4309 Maple St. Abilene, TX 79602-8044 915-695-6962 ext 115
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