Bonzo Armstrong
2004-Jun-21 03:42 UTC
[Asterisk-Users] Channel bank problem via long cable
I've got a Digium TE405P feeding three Carrier Access AB-II units located in three separate suites of the complex my company resides in. I've had one AB-II connected over about 15' of cable and running for several weeks now, and it seems to be perfectly happy. Over the weekend, I added two more AB-IIs, one in each of the other two suites. The second unit is about 150 cable feet away from the switch and it syncs up just fine, but the third is 400 cable feet away and is having problems with its T1. The dip switches on all three units are set the same, and with the exception of the LBO they're all configured the same in zaptel.conf, yet the furthest AB-II is showing errors. I've swapped AB-IIs between positions to no effect; whichever unit is in the furthest suite cannot fully sync. There are at least two cables available in each segment of the run between the far AB-II and the switch (due to the way our complex is wired, the run is a total of three in-wall cables and four patch cables), and I have tried them all. I have also tried plugging into other ports on the TE405P. I've tried changing the signalling and the framing. I've tried changing the LBO value to everything from 0 to 4. Through all this, the constant appears to be that any AB-II placed 400' away from the switch will not behave. When initially connected, the led next to the T1 jack on the AB-II blinks yellow a few times, then turns green for at most a quarter second and then to solid yellow where it stays. The other status led on the AB-II for the span stays a solid green. Picking up a phone connected to this unit gets me a very noisy dialtone. If I dial a single digit to get rid of the dialtone, I hear a pretty steady buzzing noise where there should be silence. The curious thing here is that if I use this phone to dial another extension, 1) there is no problem dialing and 2) if I use a station that's working properly to listen to the voicemail message, I hear a perfectly clear signal with just a hint of that same buzzing in the background. My zaptel.conf looks like this: span=1,1,0,d4,ami span=2,1,0,d4,ami span=3,1,4,d4,ami fxoks=1-16 fxoks=17-24 fxoks=25-48 fxoks=49-72 Can anyone tell me what I'm missing or what else I might try? Thanks in advance.
Do you have access to a T-1 analyzer? You more than likely have a 'dirty' T-1 line that is out of spec based on the length of the run. Nik -----Original Message----- From: asterisk-users-admin@lists.digium.com [mailto:asterisk-users-admin@lists.digium.com] On Behalf Of Bonzo Armstrong Sent: Monday, June 21, 2004 5:43 AM To: asterisk-users@lists.digium.com Subject: [Asterisk-Users] Channel bank problem via long cable I've got a Digium TE405P feeding three Carrier Access AB-II units located in three separate suites of the complex my company resides in. I've had one AB-II connected over about 15' of cable and running for several weeks now, and it seems to be perfectly happy. Over the weekend, I added two more AB-IIs, one in each of the other two suites. The second unit is about 150 cable feet away from the switch and it syncs up just fine, but the third is 400 cable feet away and is having problems with its T1. The dip switches on all three units are set the same, and with the exception of the LBO they're all configured the same in zaptel.conf, yet the furthest AB-II is showing errors. I've swapped AB-IIs between positions to no effect; whichever unit is in the furthest suite cannot fully sync. There are at least two cables available in each segment of the run between the far AB-II and the switch (due to the way our complex is wired, the run is a total of three in-wall cables and four patch cables), and I have tried them all. I have also tried plugging into other ports on the TE405P. I've tried changing the signalling and the framing. I've tried changing the LBO value to everything from 0 to 4. Through all this, the constant appears to be that any AB-II placed 400' away from the switch will not behave. When initially connected, the led next to the T1 jack on the AB-II blinks yellow a few times, then turns green for at most a quarter second and then to solid yellow where it stays. The other status led on the AB-II for the span stays a solid green. Picking up a phone connected to this unit gets me a very noisy dialtone. If I dial a single digit to get rid of the dialtone, I hear a pretty steady buzzing noise where there should be silence. The curious thing here is that if I use this phone to dial another extension, 1) there is no problem dialing and 2) if I use a station that's working properly to listen to the voicemail message, I hear a perfectly clear signal with just a hint of that same buzzing in the background. My zaptel.conf looks like this: span=1,1,0,d4,ami span=2,1,0,d4,ami span=3,1,4,d4,ami fxoks=1-16 fxoks=17-24 fxoks=25-48 fxoks=49-72 Can anyone tell me what I'm missing or what else I might try? Thanks in advance. _______________________________________________ Asterisk-Users mailing list Asterisk-Users@lists.digium.com http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users