> > 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. _______________________________________________ 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
