Does anyone know how to use ztmonitor to set gain on a PRI circuit via a TE410P card, or is it just for FXO?
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Marek Zachara Sent: Friday, September 09, 2005 2:55 PM To: Asterisk Users Mailing List - Non-Commercial Discussion Subject: Re: [Asterisk-Users] Huge Echo > > Pull the clone card out of the system and look for the chipset numbers > on the card. Go to the chip manufacturers web site and find the specs > for that chip set. The specs will likely tell you the chipset was > designed for the US 600 ohm impedance telephone network, and if your > country's telco specs are different (which I'm very sure they are), > through away the clone card. Without proper impedance matching there > isn't anything your going to be do to fix the problem. I can check the chip on monday, but local telco impedance requirements are 600 ohms - just like US. > > > > I'm thinking about playing around with increasing/decreasing > > resistance by placing additional resistors in the circut. Messy, but > > if it could help... What do you think? > > Adding resistance has nothing at all to with impedance matching. > Resistance will impact the DC loop, but not the AC impendance. The AC > impedance is a function of how the chipset was designed. > AFAIR, the impedance is not a simple factor, but a combination of passive resistance plus reactance - which usually varies within measured frequency range. Therefore channging the device resistance WILL change its impedance. I know the result will not be perfect, but at least i hope for better load match than it is now. I assume the specified impedance is required within PSTN frequencies which will be roughly 100-4khz, right? Marek _______________________________________________ --Bandwidth and Colocation sponsored by Easynews.com -- 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 The contents of this email message and any attachments are confidential and are intended solely for addressee. The information may also be legally privileged. This transmission is sent in trust, for the sole purpose of delivery to the intended recipient. If you have received this transmission in error, any use, reproduction or dissemination of this transmission is strictly prohibited. If you are not the intended recipient, please immediately notify the sender by reply email and delete this message and its attachments, if any. _______________________________________________ --Bandwidth and Colocation sponsored by Easynews.com -- 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
