search for: 0dbm

...ptimum gain settings for a bank of analog lines connected to a channel bank. My telco has provided a 'Type 102' test line to use for incoming level calibration. This is functionally equivalent to app Milliwatt(), but provides tone from the CO inwards. Question is, how should one use this a 0dbm test source with ztmonitor? Am I correct in understanding that a 0dbm level should provide a 100% drive in the level monitor, not a 50% drive as is otherwise 'optimum' for regular voice traffic? Kris Boutilier Information Systems Coordinator Sunshine Coast Regional District

Hello, In my quest to figure out the source of the random echo on our shiny new asterisk install, I have been using ztmonitor on the TDM400p channels for the good part of today. I have 2 TDM400p cards with 8 FXO modules and 6 pots lines connected to them (last 2 channels are unused but configured in zaptel). Even when the lines are onhook, the Tx values settle down to 0 but the Rx values still

I came into this with my eyes wide open. I have read ABSOLUTELY EVERYTHING there is to be found on the net about avoiding echo problems BEFORE I even attempted to create a production system. Since lots of people are apparently using this in production environments now I just assumed that echo IS avoidable. As others have recommended, I created a test system with the proposed production

...have disabled everything that is not needed and I do not believe I have any IRQ problems and I am NEVER wrong ;). Calls are crisp and clear. . No snap, crackle, pop. It would be a beautiful thing if not for the echo. To get the RX/TX levels, run "ztmonitor 1 -vv", dial a telco 1004hz 0dbm test phone # and set the quantitative RX number to around 14500. With 2 lines (which I don't have) you test the TX level by looping out to the other PSTN. Without a second line you do the simple ztmonitor test for the TX levels. http://www.voip-info.org/tiki-index.php?page=Asterisk+zapata+gai...

We are having trouble with an installation that is getting a lot of echo on some calls. The installation is all SIP phones and they have a VoIP provider. When we call through the voip provider and into another of their customers (voip throughout) there is no echo problem. If we call in their landline, through the TDM400's FXO to one of the SIP phones, there is no echo problem. Sometimes