Use 1 for timing. You actually do have a timing source to sync to. As for slips and bipolar violations... T1s are just high speed serial lines. A sleep is when you loose sync with the far side and when you see a 1 come across the line, you may not know which bit it was for. This would be a slip. Bipolar violations are a part of the signaling, but can also be errors. A T1 alternates the polarity of the 1 pulse to allow the line to run farther on lower voltage. Just doing alternating polarity is AMI or Alternate Mark Inversion. A bipolar violation is when a bit is received as the same polarity as the last bit received. On an AMI line a bipolar violation is an error. On a B8ZS, bipolar violations are intentionally inserted into the line to keep the line from transmitting too many 0's in a row and contributing to a slip. When set for B8ZS the "error" is somewhat expected and ignored.
On Sun, 2003-06-29 at 23:19, Andy Hester wrote: > Thanks for the info... I've answered your questions below. I am not > experienced with telecom at this level (yet), but this sounds like really > good info to quiz XO's switch tech over. > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] Behalf Of Steven > Critchfield > Sent: Sunday, June 29, 2003 9:40 PM > To: [EMAIL PROTECTED] > Subject: Re: [Asterisk-Users] Help! Problems talking to upstream switch > > > Whats the sound quality like on the calls especially when multiple calls > are going? > > No problems with sound quality save the slight echo on calls over the TDM > circuit. > > > On my home system, I had a problem that DTMF was sometimes not correctly > recognized and would either dial incorrectly or not at all. It was > evedent when dial tone was played that it crackled. Also when multiple > calls where running each would start to sound like crap. This was later > tracked down to a timing problem. > > Since you mention using a CAC with 2 ports on it and a router, I'm going > to assume you have a ADIT 600. Make sure the Adit is set to take timing > from the telco, and then make sure you are set to take your timing from > it. Check to make sure each of the T1 ports a:1 and a:2 are set to take > timing from a:1 if it is your telco port. This will keep you from > slipping and causing potential problems. > > I haven't looked around inside the CAC yet since it is XO's, not sure if it > is an > ADIT 600 but it sounds like the same unit. I am set to "0" for timing and > "0" for > LBO in Zaptel.conf I assume this is correct for * and that I need to verify > the a:1/a:2 timing settings in the CAC unit? > > Come to think of it, there is a way to test this without bringing the > T1s down. The Adit 600 has a show performance command, I may be wrong, > but I'm sure it was performance, anyways it allows you to see slips and > bipolar violations and a couple other stats. This was beneficial for me > as the T100P didn't report problems but the Adit did. > > Can you give me a brief idea of what slips and bipolar violations are? > > Home this helps. > > I am glad to find that someone knows more than my little knowledge of the > subject! > To here the techs talk you'd think that they'd never run into anything like > this before. > > > On Sun, 2003-06-29 at 20:59, Andy Hester wrote: > > Hi, > > Please let me know if you have any ideas - I am taking wild guesses > now.... > > Here is the situation: > > > > I put in Asterisk for a local customer. I have Fractional T-1 with 12 > > Voice & 12 Data. I have a T100P hooked up to a TDM Card (they call it a > > chanel bank although it only has 2 outputs) in a CAC unit. The unit also > > has a router card that runs the data side. My extensions are all SIP > phones > > save a few fax machines. The customer has 7 digit unverified account > codes > > on the trunks for billing purposes. > > > > The Problem: > > > > As I watch the console, I see calls coming in for exten "73" or "708" or > > "08" or "730" although most come in correctly (ie "7308"). My carrier has > > verified numerous times that they are sending 4 digits. I have 40 DID > > numbers that need to be routed and they are all in the 73xx range. I need > > to know anything that would cause my box randomly not to hear all 4 digits > > on occasion. Also, I have had trouble with people who dial out getting a > > congestion signal mainly on Long Distance numbers. The person would dial > > the number 4 or 5 times and get congestion then it might go through. Both > > of these conditions seem to be happening only about 10-20% of the time. > > > > What I have done: > > > > Moved a T100P card to its own IRQ to prevent problems with interrupts - > Did > > not solve either issue. > > > > On the second try, got the carrier to change the way their switch chooses > > channels for incoming calls to prevent "glare" - This MAY have fixed the > > outgoing long distance issue as it seems to have gone away( although it > > doesn't seem logical to me that this would affect only LD) but did not fix > > incoming calls. > > > > Has anyone else had problems getting all of the digits that the Telco > sends? > > > > Thanks, > > Andy Hester > > Consero > > > > _______________________________________________ > > Asterisk-Users mailing list > > [EMAIL PROTECTED] > > http://lists.digium.com/mailman/listinfo/asterisk-users > -- > Steven Critchfield <[EMAIL PROTECTED]> > > _______________________________________________ > Asterisk-Users mailing list > [EMAIL PROTECTED] > http://lists.digium.com/mailman/listinfo/asterisk-users > > _______________________________________________ > Asterisk-Users mailing list > [EMAIL PROTECTED] > http://lists.digium.com/mailman/listinfo/asterisk-users -- Steven Critchfield <[EMAIL PROTECTED]> _______________________________________________ Asterisk-Users mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users
