> How would you test the audio properties of an FXO line? I am interested > in a way to generate a tone of 1 khz, send it out a line, measure hwo > the channel bank has converted that tone to real audio, and measure the > attenuation. Otherwise it all seems like guesswork. > I do have a Dynatel 745 Subscriber Loop Tester, although I have no idea > how to use it.
Several ways to do that depending upon what you have available for resources. - use the asterisk milliwatt generator (dial into it) - I use an old Cisco ata186 for sip-to-test-equipment connections - get the milliwatt number for the Central Office you're connected to >From what I can tell, the 745 does not have a tone generator, so you will either need to use a milliwatt generator (CO or asterisk). Connect the 745 to the rj11 port of an ata186 (or sipura, fxs port, etc), and dial the milliwatt. It generates 0db tone at 1000 hz, same as the CO based milliwatt. Use the 745 to measure the tone level to ensure you can make the equipment work correctly. Use the 745 on another telco line to dial into your asterisk (to its milliwatt) and measure the tone level. The difference is your pstn loss (divid by two if both pstn lines are analog). If you have access to the CO milliwatt, dial into it using the 745 to determine what loss your pstn line has. Use that value as your reference for all other connections that you might want to test through your channel bank. Once you know what the pstn loss is (without the channel bank) then you can test about anything taking that value into consideration. Rich _______________________________________________ --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
