[GreenKeys] OT - rotary dial telephone specs

[Jeffrey D Angus]

On 6/3/2013 4:23 PM, gil at baudot.net wrote:
> Anyway, fun stuff.  In these days of disposable technology and
> standards in the software world that change fluidly every few
> months, it is really nice to find that my 80- and 90-year old phones
> not only pass audio on today's landlines, but dial flawlessly as well.

Well  yes. I have a Stromberg Calson original Candlestick phone
with dialer. It works just fine at the shop out here in Ranger, TX.

You'll note that ALL the subsequent phone stuff that was introduced
to the market after the "Carterfone lawsuit" was based on the
-48VDC open and 6-10 mA closed line imepdances and 120 VAC
22 Hz ringer signal.

Ah indeed, backwards compatibility for over 100+ years.

Jeff-1.0
wa6fwi


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