On Thursday 14 September 2017 at 15:03 Jim Birch wrote: > This [POTS continuing to operate] would be an almost mandatory feature to > decrease the irate customer and/or horror headline risk where there is an > issue with some component of the FTTN system. Granny death on NBN phone > failure anyone? > > My FTTN line cutover had the same service continuity, but that's on a > separate channel.
My guess is that FTTN nodes multiplex the POTS and VDSL2 signals onto the copper by default, just as is done now with POTS & ADSL, but the POTS signal is jumpered out unless a customer specifically asks for "voiceband continuity". The POTS signal would then occupy the bottom 100Hz to 4KHz, and VDSL from 25KHz to 25MHz (?). My friend had a POTS service configured with dual numbers and ring cadences, one of which was detected by her FAX machine. This option isn't available now, but it enabled a user to have separate 'phone & FAX numbers with a single line rental charge (and of course only one at a time could operate). Perhaps she was given voiceband-continuity as a replacement? You can see Telstra will get a nice windfall selling off all that exchange real estate after the MTM complaints fade away and everyone is kicked off POTS onto VoIP. David L. _______________________________________________ Link mailing list [email protected] http://mailman.anu.edu.au/mailman/listinfo/link
