In an article on voip-info.org ( http://www.voip-info.org/wiki/view/Asterisk+setup+research+lab ) , it is suggested that one thing you can try to reduce echo is to insert a 500 ohm resister on the ring line of the POTS line. Has anyone successfully tried this? What was your experience. Also, what size 500 ohm resister would you use? I am not an electrical engineer, but I can wire a circuit in series. Any other echo reducing suggestions would be greatly appreciated! -- Michael Boers -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.digium.com/pipermail/asterisk-users/attachments/20070406/6053dadd/attachment.htm
Michael Boers wrote:> In an article on voip-info.org <http://voip-info.org> ( > http://www.voip-info.org/wiki/view/Asterisk+setup+research+lab ) , it > is suggested that one thing you can try to reduce echo is to insert a > 500 ohm resister on the ring line of the POTS line. Has anyone > successfully tried this? What was your experience. Also, what size > 500 ohm resister would you use? I am not an electrical engineer, but > I can wire a circuit in series. > > Any other echo reducing suggestions would be greatly appreciated! > -- > Michael BoersFor non PSTN situations, some have had success with a 2 or 3 mile artificial line along with gain adjustments John Novack
On Fri, Apr 06, 2007 at 04:11:45PM -0400, Michael Boers wrote:> In an article on voip-info.org ( > http://www.voip-info.org/wiki/view/Asterisk+setup+research+lab ) , it is > suggested that one thing you can try to reduce echo is to insert a 500 ohm > resister on the ring line of the POTS line. Has anyone successfully tried > this? What was your experience. Also, what size 500 ohm resister would you > use? I am not an electrical engineer, but I can wire a circuit in series.Which adapter do you have? for most of those that are not x100p, start with setting a proper opermode. If that is not good enough, try fxotune. Both of these play with characteristics of the card that are equivalent to adding an extra resitor and also other similar changes. -- Tzafrir Cohen icq#16849755 jabber:tzafrir@jabber.org +972-50-7952406 mailto:tzafrir.cohen@xorcom.com http://www.xorcom.com iax:guest@local.xorcom.com/tzafrir
Thanks for the suggestion. I am using a tdm400p with 4 fxo channels. I am in the US, so opermode should not be ok at default settings. I just recently got fxotune working on my system. The version that comes with zaptel 1.2.16 would simply hang. I am using the 1.4 fxotune now with the 1.2.16 driver. That has reduced the echo coefficient from 35% to 8%. We will see how that does. -- Michael Boers On 4/6/07, Tzafrir Cohen <tzafrir.cohen@xorcom.com> wrote:> > On Fri, Apr 06, 2007 at 04:11:45PM -0400, Michael Boers wrote: > > In an article on voip-info.org ( > > http://www.voip-info.org/wiki/view/Asterisk+setup+research+lab ) , it is > > suggested that one thing you can try to reduce echo is to insert a 500 > ohm > > resister on the ring line of the POTS line. Has anyone successfully > tried > > this? What was your experience. Also, what size 500 ohm resister would > you > > use? I am not an electrical engineer, but I can wire a circuit in > series. > > Which adapter do you have? > > for most of those that are not x100p, start with setting a proper > opermode. If that is not good enough, try fxotune. > > Both of these play with characteristics of the card that are equivalent > to adding an extra resitor and also other similar changes. > > -- > Tzafrir Cohen > icq#16849755 jabber:tzafrir@jabber.org > +972-50-7952406 mailto:tzafrir.cohen@xorcom.com > http://www.xorcom.com iax:guest@local.xorcom.com/tzafrir > _______________________________________________ > --Bandwidth and Colocation provided by Easynews.com -- > > asterisk-users mailing list > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users >-------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.digium.com/pipermail/asterisk-users/attachments/20070406/e4852397/attachment.htm
Oops, meant to say that opermode should BE ok at default settings. On 4/6/07, Michael Boers <michaelscotttech@gmail.com> wrote:> > Thanks for the suggestion. I am using a tdm400p with 4 fxo channels. I > am in the US, so opermode should not be ok at default settings. I just > recently got fxotune working on my system. The version that comes with > zaptel 1.2.16 would simply hang. I am using the 1.4 fxotune now with the > 1.2.16 driver. That has reduced the echo coefficient from 35% to 8%. We > will see how that does. > > -- > Michael Boers > > On 4/6/07, Tzafrir Cohen <tzafrir.cohen@xorcom.com> wrote: > > > > On Fri, Apr 06, 2007 at 04:11:45PM -0400, Michael Boers wrote: > > > In an article on voip-info.org ( > > > http://www.voip-info.org/wiki/view/Asterisk+setup+research+lab ) , it > > is > > > suggested that one thing you can try to reduce echo is to insert a 500 > > ohm > > > resister on the ring line of the POTS line. Has anyone successfully > > tried > > > this? What was your experience. Also, what size 500 ohm resister > > would you > > > use? I am not an electrical engineer, but I can wire a circuit in > > series. > > > > Which adapter do you have? > > > > for most of those that are not x100p, start with setting a proper > > opermode. If that is not good enough, try fxotune. > > > > Both of these play with characteristics of the card that are equivalent > > to adding an extra resitor and also other similar changes. > > > > -- > > Tzafrir Cohen > > icq#16849755 jabber:tzafrir@jabber.org > > +972-50-7952406 mailto:tzafrir.cohen@xorcom.com > > http://www.xorcom.com iax:guest@local.xorcom.com/tzafrir > > _______________________________________________ > > --Bandwidth and Colocation provided by Easynews.com -- > > > > asterisk-users mailing list > > To UNSUBSCRIBE or update options visit: > > http://lists.digium.com/mailman/listinfo/asterisk-users > > > >-------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.digium.com/pipermail/asterisk-users/attachments/20070406/650e6dc3/attachment.htm
Michael Boers wrote:> Thanks for the suggestion. I am using a tdm400p with 4 fxo channels. I > am in the US, so opermode should not be ok at default settings. I just > recently got fxotune working on my system. The version that comes with > zaptel 1.2.16 would simply hang. I am using the 1.4 fxotune now with > the 1.2.16 driver. That has reduced the echo coefficient from 35% to > 8%. We will see how that does.It should be lower still -- under 5%. Do you have other analog extensions hanging off the line between the demarcation and the Asterisk server? Do you have loose wires hanging off the line between the demarcation and the Asterisk server? How clean are the terminations? You can go a long way by cleaning up a substandard wiring job. -Stephen-