You're refering to inserting artificial resistance on just the tip - wouldn't that introduce a longitudinal imbalance between tip & ring?
> -----Original Message----- > From: Chad Scott [mailto:[EMAIL PROTECTED] > Sent: October 12, 2004 11:33 AM > To: Asterisk Users Mailing List - Non-Commercial Discussion > Subject: Re: [Asterisk-Users] Chaining more than one zap echo > canceller? > > > If you're certain it is an impedance problem and the > impedance of your > line is lower than that of the CO, you can increase the impedance of > your line by putting a potentiometer in-line and adjusting it > until the > sidetone disappears. This is a bare-bones solution and decreases the > efficiency of the line because you're putting in pure resistance. > > If your impedance is higher than the CO, or if you want to be more > efficient, you'll need a more complicated impedance matching network. > > On Oct 12, 2004, at 10:26 AM, Kris Boutilier wrote: > > > I have Asterisk connected to a channel bank via a t100p card. There > > excessive sidetone generated on the analog side due to an impedance > > mismatch > > - I am very close to my serving CO which brings the line > down to about > > 150ohms and the channel bank is expecting 600ohms. However, > the very > > loud > > sidetone is being fairly effectively supressed by the zap echo > > canceller and > > I have quite usable lines as a result. {clip} _______________________________________________ Asterisk-Users mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
