[LINK] NBN & POTS
Kim Holburn
kim at holburn.net
Thu Sep 14 19:12:11 AEST 2017
Doesn't VDSL have an initial mode, like mixed mode, until all the lines are VDSL and then they can change it to VDSL only mode which is supposedly slightly faster?
> On 2017/Sep/14, at 3:56 PM, David Lochrin <dlochrin at key.net.au> wrote:
>
> 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.
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Kim Holburn
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