If you look at the old model 500 desk sets you will find that some had a
grove in the top of one of the switch hook buttons. That was to allow
you to pull the button up further than the spring would move it when the
handset was lifted off of the cradle. Pulling up on the switch hook
buttons of a properly configured telephone would disconnect the pair
from all other extension telephones on the premise to assure the users
privacy. The switch hook button was used to do this so that the switch
would not remain open after the completion of the call. Hanging up the
phone would reset the special switch to normal. Since the phones of
that era were hard wired to the pair there was no possibility of
disabling the line by unplugging the telephone. With the advent of
modular plugs the use of such a phone required the installation of an
RJ31X jack so that if the instrument was unplugged the continuity of the
line was kept intact by shorting bars built into the jack.
"This alternating current stuff is just a fad. It is much too dangerous
I haven't noticed a quality problem in recent phones, unless you do
something like get on the other side of a large metal object from the
base on get too close to the limit of its range (normally considerably
less than claimed).
On Wed, 15 Nov 2006 21:46:48 -0500, Jud McCranie
Thanks to everyone who replied. Although some of the discussion was
over my head, I learned enough to get the much-needed kitchen wall
phone/answering machine working again. I know what to do to try to
get the others back, if needed.
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