On Jun 26, 2016 12:14 PM, "James Knott via talk" <talk@gtalug.org> 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. :-)
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