On Wed, 23 Dec 2020 23:18:26 +0000, Chris Green wrote:

> Deloptes  wrote:
>> Ahem A Rivet's Shot wrote:
>>
>> > When I had FTTH installed here the first thing they did (after
>> > erecting a couple of poles) was run copper to the house with a POTS
>> > service on it, then a week or so later another crew turned up and
>> > installed the fibre. The POTS service is active but never used. It
>> > would make a lot more sense if the fibre termination was powered by
>> > the 50V on the POTS line but it's powered by being plugged into the
>> > mains.
>>
>> May be I am understanding something different under POTS than you guys.
>>
>> Plain old telephone service, or plain ordinary telephone system, is a
>> retronym for voice-grade telephone service employing analog signal
>> transmission over copper loops (Wikipedia)
>>
>> Notice "analog signal".
>> Even if you have copper the last 50m or 3km - it does not mean it is
>> POTS on it.
>
> Since the phone hanging on the end it still an analogue device requiring
> 50v DC to ring then the last section *is* still POTS.
> `
In the UK POTS phones, regardless of whether they have a dial or keys, is
powered over the phone line: the clue is that there is only one cable
connected to it and that plugs into the phone socket. This is a safety
feature; the phone still works during a power cut provided that the phone
line wasn't damaged too.

Some UK POTS phones were quite a lot fancier than that. For example, I'm
still using an old Amstrad SP2050 POTS phone on my land line which must
be around 35 years old. This has a keypad rather than a dialler,
selectable tone or pulse dialling, hands-free operation (a speaker plus a
mute button) and can store up to 10 phone numbers.


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Martin    | martin at
Gregorie  | gregorie dot org

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