Ole, It is not unheard of for a cable between the CSU and the demarc (SJ) to start flaking out. You said that "you did that", meaning what? Did you replace the cable and reset the WIC or did you do one and not the other? I've had a simple reseat of the cable into the back of the SJ fix problems for me before. I would have done one first and then tried the other rather than taking a shotgun approach because the shotgun method doesn't allow you to discover exactly what the problem was. What about your service-module? (show service-module XX) Was it reporting any problems? Most specifically did it register any bipolar violations? It's been my experience that bipolar violations indicate a local copper problem which would have pointed more to the cable than to the WIC. You could still have a SJ problem. When looping the SJ, they cannot test through the port to which you are connecting. (Unless you provide a loopback plug for them to test to). Further, sometimes SJs (depending on vendor) have a switch or software option for AMI or B8ZS. If there is a switch and if your service is suppose to be using B8ZS, then the SJ should be set for B8ZS. Some vendors' SJs can get flakey and alternate between AMI and B8ZS, causing you problems. Anytime I dispatch a LEC technician I request that they check that option and set it accordingly, rather than leaving it set to AUTO detect. (there's that "auto detect" stuff again... :)
I'm not a big fan of integrated CSUs. I miss the days of having a standalone CSU and then my router behind it. We would have 2 POTS lines, 1 for the CSU and 1 for the router. We were able to pinpoint our problems and get resolution much faster. Always check what your CSU has to say about a line condition. You apt to get more detail from it rather than from a simple interface command output. Most CSUs record performance information in increments of 15 minute periods (96 blocks) for a 24 hour period. You can then see nearly exactly what was occurring over the past day and when it occurred. HTH, Chris -----Original Message----- From: Ole Drews Jensen [mailto:[EMAIL PROTECTED]] Sent: Thursday, January 03, 2002 4:08 PM To: [EMAIL PROTECTED] Subject: Carrier Transitions : Any Comments [7:30829] My networking skills are apparently being tested these days, because the frame relay circuit went down to one of my branch offices. I got someone at the local office to telnet into the router, which was down/down, and the LMI was down/down, and there were just under 10 carrier transitions in the last 24 hours. I had them powercycle the router without any luck. I concluded that my provider was most likely the cause of the problem, and that it was at the branch office circuit, since my router here was talking fine with the other two remote offices, and my LMI was up/up. My provider told me that the circuit was bouncing, or in other words, it had been going down and back up several times since yesterday evening. After several hours, they did an out of service test, where they told me that it had tested dirty to the CSU but clean to the SmartJack, so they were going to put it on hold until I had replaced the WAN cable and reseated the WIC-1DSU-T1 card in the 1720 router. I went out to the branch office and did that, and the PVC has after I powered it on been up for about an hour now. My question now is: Is this (A) a normal thing that you suddenly have to reseat the WIC and/or replace the WAN cable, and that it can cause carrier transitions, or is this more likely (B) my provider that has found and corrected the error on their site, but now is trying to make it look like it was my equipment that was faulty, or (C) ???? Thanks for any comments to this, Ole ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Ole Drews Jensen Systems Network Manager CCNP, MCSE, MCP+I RWR Enterprises, Inc. [EMAIL PROTECTED] ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ http://www.RouterChief.com ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ NEED A JOB ??? http://www.oledrews.com/job ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=30847&t=30829 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
