(usr-tc) ISDN connection problems at 56K
I have a community that is within our local calling scope that has always required the ISDN connections be set for 56K on the client equipment. If we set the client for 64K it would connect but no data would pass on the line (both ends of the connection think there is a valid connection, this really confuses the telco). In the last month or so I have begun having problems where the circuits will not pass data for various length periods of time, then will begin working. The routers (multiple sites) do not drop and redial the calls, they are online the whole time (I have watched both the leds and the system monitors at our end and the customer end). The telco is convinced that if there is really a connection problem the ISDN connection would immediately drop, but that is not my experience in this case. Any ideas? Mark Thornton San Marcos Internet, Inc. 512-393-5300 - 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.
We had a similar problem here also, including affecting analog calls too. The problem ended up being interoffice trunks on Ameritech's network between two local end offices. 2 T-1s out of 7 were taking errors. Since signalling occurs on the ends of the calls and SS7 is on these trunks, the call wouldn't drop. It took us 3 months to get them to find the problem. Jeff u>I have a community that is within our local calling scope that has u>always required the ISDN connections be set for 56K on the client u>equipment. If we set the client for 64K it would connect but no data u>would pass on the line (both ends of the connection think there is a u>valid connection, this really confuses the telco). In the last month u>or so I have begun having problems where the circuits will not pass u>data for various length periods of time, then will begin working. The u>routers (multiple sites) do not drop and redial the calls, they are u>the online the whole time (I have watched both the leds and system u>monitors at our end and the customer end). The telco is convinced that u>if there is really a connection problem the ISDN connection would u>immediately drop, but that is not my experience in this case. u>Any ideas? u>Mark Thornton u>San Marcos Internet, Inc. u>512-393-5300 CMPQwk 1.42 9999 - 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.
Also sprach Mark Thornton
I have a community that is within our local calling scope that has always required the ISDN connections be set for 56K on the client equipment. If we set the client for 64K it would connect but no data would pass on the line (both ends of the connection think there is a valid connection, this really confuses the telco). In the last month or so I have begun having problems where the circuits will not pass data for various length periods of time, then will begin working. The routers (multiple sites) do not drop and redial the calls, they are online the whole time (I have watched both the leds and the system monitors at our end and the customer end). The telco is convinced that if there is really a connection problem the ISDN connection would immediately drop, but that is not my experience in this case.
I'm in agreement with Jeff Binkley here... Definitely sounds like an inter-office trunk problem (particularly since they would only run at 56kbps initially). Good luck getting the telco to find it. They will swear up and down that it can't be their trunks because, "we're the telephone company." (not in so many words, but that's the attitude). If you can get an ISDN test set to make the call with...that should show up the problems without too much trouble at all. -- Jeff McAdams Email: jeffm@iglou.com Head Network Administrator Voice: (502) 966-3848 IgLou Internet Services (800) 436-4456 - 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.
The telco has resolved the problem down to the IMT trunks as well. Oddly though, I rebooted the TCH and am getting better performance since doing so. The telco did confirm the behaviour of the 56K vs. 64K connections. When I attempt 64K it accepts the call and routes it to a different tandem location which then hands back to my telco, but my telco hits that tandem with 56K as well. The tech is running tests over the local tandem to see what the problem might be, but has put in a request to move the interconnects to 64k. They did this in another office recently and I am hopeful they will also do it here. The remote telco is Verizon, and since they took over from GTE we have had nothing but excellent response from the techs. They are working with very outdated equipment that was poorly maintained, but the techs can apparently get replacement and upgrade parts that were never available when they were wearing GTE caps. Mark Thornton San Marcos Internet, Inc. 512-393-5300 ----- Original Message ----- From: "Jeff Mcadams" <jeffm@iglou.com> To: <usr-tc@lists.xmission.com> Sent: Thursday, January 04, 2001 3:37 PM Subject: Re: (usr-tc) ISDN connection problems at 56K
Also sprach Mark Thornton
I have a community that is within our local calling scope that has always required the ISDN connections be set for 56K on the client equipment. If we set the client for 64K it would connect but no data would pass on the line (both ends of the connection think there is a valid connection, this really confuses the telco). In the last month or so I have begun having problems where the circuits will not pass data for various length periods of time, then will begin working. The routers (multiple sites) do not drop and redial the calls, they are online the whole time (I have watched both the leds and the system monitors at our end and the customer end). The telco is convinced that if there is really a connection problem the ISDN connection would immediately drop, but that is not my experience in this case.
I'm in agreement with Jeff Binkley here...
Definitely sounds like an inter-office trunk problem (particularly since they would only run at 56kbps initially). Good luck getting the telco to find it. They will swear up and down that it can't be their trunks because, "we're the telephone company." (not in so many words, but that's the attitude).
If you can get an ISDN test set to make the call with...that should show up the problems without too much trouble at all. -- Jeff McAdams Email: jeffm@iglou.com Head Network Administrator Voice: (502) 966-3848 IgLou Internet Services (800) 436-4456
- 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.
- 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 (3)
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Jeff Mcadams -
jeff.binkleyļ¼ asacomp.com -
Mark Thornton