On Jun 26, 2016 12:14 PM, "James Knott via talk" <[email protected]> wrote: <snip> > I don't know what power is provided on dry loops, but I believe there's > still "battery" on the line. On a
You put the word battery in quotes. Perhaps you mean a Rogers valve? I think that's how the patent names it. When I was a kid every corner store had a tube tester for DIY repairs. Anecdotally I remember CFRB as Canada's First Rogers Battery? The Rogers valve was what allowed a radio to run on home current. regular phone line, if the device > draws enough current, the exchange will consider the line "seized" and > not send ringing current on it. If not enough current is drawn, then > ringing is possible. > > > I don't know for sure myself. I always assume the last quarter mile is > > analog, but that may have changed for newer condo and residential home > > development. > > > > > What's generally referred to as the "last mile" can be anything from > right next door to several kilometres. For examples, in an apartment I > used to rent, the exchange was just a block away. Here, a couple of > blocks. When I was a kid, growing up in Oakville, it was about 3-4 Km > and it may be much further elsewhere. > > BTW, many years ago, before amplifiers, it was possible to make a call > from New York to Colorado, before it became too weak. Wow you look a lot younger in your picture. :-) > --- > Talk Mailing List > [email protected] > https://gtalug.org/mailman/listinfo/talk
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