This sounds like it may be a 'flag' on the line. Some of these old telco lines were originally only used for voice, and when a line is re-used the outside plant tech might just tap into a line leaving a long un-used flag or tail on the line. This was ok for voice, but for T1 or above it acts line a huge antannae and causes problems.
One way to verify this is to always run the following BERT patterns before accepting a circuit for a minimum of 3 minutes each. (or require the telco to do it for you) all-ones 1:7 2 in 8 3 in 24 QRSS All-Zeroes (if B8ZS) Jeff Senior Telecom Tech CCNP ""Erich Kuehn"" wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > I just finished testing with the lec (XO), while they could run clean to the > NIU, they had a problem running quazi to the csu. Finally I think they will > be taking some responsiblility for the issue. > > Thanks for everyones input, > > Im learing way more about Layer 1 than I care to, but then again isnt > knowledge, power!??? > > Thanks > > Erich > > -----Original Message----- > From: Steven A. Ridder [mailto:[EMAIL PROTECTED]] > Sent: Wednesday, January 09, 2002 11:06 AM > To: [EMAIL PROTECTED] > Subject: Re: Serial Line problems [7:31426] > > > If it was a crossed pair somewhere, it wouln't come up at all. No carrier. > > It can very well be bad dmarc extensions, but so many all at once. Is it > all in one area of the state/city? Could still be bad telco wiring if in > same area of CO. > > I believe that the customer of yours receive timing on the CO, not your > frame-switch, even though your souce is supposed to be higher. Are you not > synced with the telco switch or the USNO? > > Maybe someone else can speak about the avail banwidth output, but I just > checked a T1 frame module, and I have the same output, so I don't think it's > that. I'll look that one up though. > > I'd still focus on the timing. > > -- > RFC 1149 Compliant. > > > FAQ, list archives, and subscription info: > http://www.groupstudy.com/list/cisco.html > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=31549&t=31426 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
