RE: (usr-tc) CT1 problem / Line Coding Errors
[My earlier attempt to post regarding this subject didn't make it due to using different smtp server] -> -----Original Message----- -> From: owner-usr-tc@lists.xmission.com -> [mailto:owner-usr-tc@lists.xmission.com]On Behalf Of Mark Thornton -> Sent: Friday, February 04, 2000 12:19 PM -> I am having a problem on three incoming CT1's that are -> terminated by the T1 -> card to quad modems. We are seeing "bipolar violations", "code violation -> errors", and "bursty errored seconds". The telco has looked into the hdsl -> carrier and it shows no errors. Neither does the central switch.
I began looking for problems when the number of people -> complaining about not -> being able to stay online jumped significantly today. They report the -> problem has been going on for the past two days. -> -> Does anyone have any thoughts on what these errors point to?
Line coding errors? Check out the new updates to my "Line Coding Errors" page at http://808hi.com/56k/coding.htm Line coding errors may be much bigger issue than some think - can also occur in telco/clec facilities between subscriber and your switch - something you have little control over! CT1 = beginning of recipe for 56k trouble get PRI if at all possible. Aloha, Richard http://808hi.com/ 56k=v.Unreliable - To unsubscribe to usr-tc, send an email to "majordomo@xmission.com" with "unsubscribe usr-tc" in the body of the message. For information on digests or retrieving files and old messages send "help" to the same address. Do not use quotes in your message.
Is this really true? That CT1's are more prone to problems than PRI? CT1 = beginning of recipe for 56k trouble get PRI if at all possible. Aloha, Richard http://808hi.com/ 56k=v.Unreliable - To unsubscribe to usr-tc, send an email to "majordomo@xmission.com" with "unsubscribe usr-tc" in the body of the message. For information on digests or retrieving files and old messages send "help" to the same address. Do not use quotes in your message.
On Sat, 12 Feb 2000, Terry Kennedy wrote:
Is this really true? That CT1's are more prone to problems than PRI?
What was very confusing about the statement (and not true) is there was an implication that CT1s performed worse when there were line coding mismatches somewhere in the chain. Being the victim of said problem, I can tell you it is equally nasty no matter what the delivery method... Charles
CT1 = beginning of recipe for 56k trouble get PRI if at all possible.
Aloha, Richard http://808hi.com/ 56k=v.Unreliable
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Charles Sprickman wrote:
On Sat, 12 Feb 2000, Terry Kennedy wrote:
Is this really true? That CT1's are more prone to problems than PRI?
What was very confusing about the statement (and not true) is there was an implication that CT1s performed worse when there were line coding mismatches somewhere in the chain.
Being the victim of said problem, I can tell you it is equally nasty no matter what the delivery method...
Yeah, if you have problems with line coding between the Tandem and the end office, or in the DIOTs, it doesn't matter if you have ISDN Prime, CH-DS1, you're going to have problems. The best thing is to keep on the telco to make sure all their trunks are configured properly. ISDN won't work when it hits a mismatched DS-1s in a trunk group. It is true that you will sometimes get about 2400bps on average better connect speed when you use PRI over CH-DS1. -Ron GLISnet, Inc. +1 810/939.9885 - To unsubscribe to usr-tc, send an email to "majordomo@xmission.com" with "unsubscribe usr-tc" in the body of the message. For information on digests or retrieving files and old messages send "help" to the same address. Do not use quotes in your message.
On Sat, 12 Feb 2000, Terry Kennedy wrote:
Is this really true? That CT1's are more prone to problems than PRI?
No, of course not. The paper also make some other rather misleading statements, like "STANDARD TESTING WILL NOT DETECT LINE CODING MIS-MATCH". Which is abusrd, line coding problems are one of the many things tested for when a T1 is turned up. The point, if any, is that automated testing may not detect line coding problems.
CT1 = beginning of recipe for 56k trouble get PRI if at all possible.
Aloha, Richard http://808hi.com/ 56k=v.Unreliable
Aaron Nabil - To unsubscribe to usr-tc, send an email to "majordomo@xmission.com" with "unsubscribe usr-tc" in the body of the message. For information on digests or retrieving files and old messages send "help" to the same address. Do not use quotes in your message.
participants (5)
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Aaron Nabil -
Charles Sprickman -
Richard Gamberg -
Ronald Kushner -
Terry Kennedy