atcomsystems.ca/forum Forums Wiring - Telecom Carriers - Trunks & Services T1's, CSU's and DSU's ALL 1's, ALL 0's, and 1 in 8 Failures

phoneman69 send me an e-mail with any questions.

I believe I have said before that it is a 4-wire hdsl circuit from adtran, no its not an hdsl4. It runs off a repeater shelf in the co straight to the cable prs. Then it hits a doubler, a xbox, then the smartjack. It is the old gray-faced hdsl technology. Why does my company still use it when they could use HDSL4? Probably cost less $$ and we all know the CEO was once an accountant.....

I have since had a few more circuits of this same design give me the same problems. I am starting to think that the old Adtran HDSL technology has outlived it's usefulness. Never have this problem with HDSL4 or even HDSL2.

Ok then. Order the HDSL4 HLU & HRE4 u need from FSL/PICS and show usage to an RT-CLLI. When the plugs arrive at your workcenter, drive down to the CO and slot the new HLU and then go to the field apparatus case and change the Doubler/HRE out and then go to customer premise and change HRU for HRU4. After circuit is back up, either build a TFAS ticket or have your local DPC(DS1+ circuit engineer) update the span design with the new electronics and send it to the CPG(circuit provisiong group) or CSDC(Customer service design center) whichever is in your region to have the WORD Doc reisssued to reflect the changes

FYI...Adtran's legacy 2B1Q HDSL equipment now looks and operates just like it's HDSL2/HDSL4 stuff. Yes, I know what kind of cards you are referring to and I would absolutely have the entire circuit path upgraded before anymore troubleshooting takes place

Hi gentlemen,

I am brand new to this forum and boy am I glad I found it, the wife is not much help when I come home from one of those 2am call-outs and I am still scratching my head trying to figure out why a T-1 went down and there seems to be no physical reason for it. (lol)

To get on with my comment I feel for phoneman69, I have struggled with T-1 issues lots of times in my 10 year tech history and have been to schools on these pesky circuits but, nothing in the lab works like the real world.

Is there any definite pattern to tell you your dealing with a cable issue or an electronic issue, I know QRSS pattern failure is likely cable issues but are there any other pattern failures more likely to be one or the other?

Hdman66, to the board. At the top of each Category you'll see a "Post New Topic", that would be the best thing to do. We encourage keeping topics on topic as it helps others in the future with searches to find things. I'm sure you'll get some good suggestions.