Rich Adamson wrote: >>> I'm trying to connect a TDM400P with an FXS module to a Valcom >>> V-9940 Paging adaptor. This port on the TDM400P was connected to a >>> 2500 Set and was working I just re-connected it to the Valcom (which >>> is known to work on a Telco POTS line) and its not picking up. The >>> Valcom docs say it need a minimum of 75 Volts at 20-30 Hz to >>> recognize a call... So the question is what ring voltage does the >>> FXS modules on a TDM400P put out? >> >> Ultimately, that depends on how much current is being drawn, but my >> multimeter reports about 70V on a 6 foot line cord. Generally, I'd >> expect an FXS to put out more like 90-110V (that's what my TalkSwitch >> supplies). > > According to the Silicon Labs spec sheet, the 3210 chip can > supply "ringing signals of up to 88v peak or more, enabling > the ProSLIC to drive a 5 REN ringer load across loop lengths of 2000 > feet or more." > > The multimeter will be measuring rms voltage, not peak.
Adding boostringer=1 to the modprobe parameters convinced my DMM to display the 89V promised. But yeah, it's not a true RMS DMM I'm using (I suspect a typical non-true RMS DMM would tend to be biased towards 60Hz and thus give odd AC readings at different frequencies - I noticed that the detected voltage would start at ~89V, but then drop as the ring phase of the cycle continued - I'm figuring it's aliasing somehow) -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.300 / Virus Database: 265.6.10 - Release Date: 10/01/2005 _______________________________________________ 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
