Hi all, I've got a TE410p connected via T1 to four channel banks (2 FXO and 2 FXS), no PRIs. Some users are complaining that they hear clicks and pops on the FXS lines, generally when they pick up the phone it's noisy. This happens only after a while, e.g. after a fresh restart of everything, all is fine but after some time these noises start appearing. From what I've read on the list, this could be down to frame slips or some problem due to synchronization. Since there's no incoming PRI to sync to, this means everything needs to be internally clocked. Could it be the internal clock source on the card has gone wonky? Or is something else in the server screwing up the clock signal? Anyone else experienced this when connecting four channel banks to the TE410? Zaptel.conf: span=1,0,0,esf,b8zs fxsks=1-24 span=2,0,0,esf,b8zs fxsks=25-48 span=3,0,0,esf,b8zs fxsls=49-72 span=4,0,0,esf,b8zs fxsls=73-96 TIA, flynn
> I've got a TE410p connected via T1 to four channel banks (2 FXO and 2 FXS), no PRIs. > > Some users are complaining that they hear clicks and pops on the FXS lines, > generally when they pick up the phone it's noisy. This happens only after a > while, e.g. after a fresh restart of everything, all is fine but after some time > these noises start appearing. From what I've read on the list, this could be > down to frame slips or some problem due to synchronization. > > Since there's no incoming PRI to sync to, this means everything needs to be > internally clocked. Could it be the internal clock source on the card has gone > wonky? Or is something else in the server screwing up the clock signal? > > Anyone else experienced this when connecting four channel banks to the TE410? > > Zaptel.conf: > > span=1,0,0,esf,b8zs > fxsks=1-24 > > span=2,0,0,esf,b8zs > fxsks=25-48 > > span=3,0,0,esf,b8zs > fxsls=49-72 > > span=4,0,0,esf,b8zs > fxsls=73-96Timing (or sync) has nothing to do with PRI's. All T1/E1 data links of any type require sync. All T1/E1 links have timing/sync included in their transmit leg and there is no way for you to turn it off. Its part of the T1/E1 spec. If you don't have any T1/E1 connections to the outside world, then pick one channel bank and call it your official source of sync, and change the above definitions to sync off that channel bank. On all other channel banks, configure them to sync off the asterisk card. If you do have a T1/E1 that comes from your telco/pstn network, use it as the source of clock sync, and config all channel banks to sync from asterisk. Your clicks will go away.
> -----Original Message----- > From: asterisk-users-bounces@lists.digium.com > [mailto:asterisk-users-bounces@lists.digium.com]On Behalf Of El Flynn > Sent: Monday, October 10, 2005 8:51 AM > To: Asterisk Users Mailing List - Non-Commercial Discussion > Subject: Re: [Asterisk-Users] Clicks, pops and noise > > > Rich Adamson wrote: > >> > >>It is on one interrupt, first thing I checked when the problem cropped up. One > >>thing I did notice was interrupt latency when doing a 'lspci -v'.. should that > >>number be 0? If so, does anyone know how to set that at boot time? > > > > > > I played around a fair amount with the latency thing and could not > > identify any noticable differences. I doubt that making changes there > > will have any impact. > > > > Rich, > > Thanks for the info! That'll save me some time since I don't > have to bark up the wrong tree :) > > On another note, I was told to double-check the memory on the server, _just_ in > case that might be the source of all my problems. We're running the Memtest86 > app overnight, maybe something will turn up tomorrow. >Assuming you've explored all the testing options layed out in http://www.mail-archive.com/asterisk-users@lists.digium.com/msg87960.html then you might get a positive effect by increasing the 'jitterbuffers' parameter in zapata.conf Hope that helps. Kris Boutilier Information Services Coordinator Sunshine Coast Regional District