On Jul 18, 12:11*pm, David Nebenzahl wrote:
On 7/18/2010 5:46 AM Andrew Rossmann spake thus:
In article ,
says...
(And by telephone I mean the kind God intended us to use, a regular old
land line, not those Dick Tracy cell-phone thingies.)
Client has a bunch of phones in their house. Starting a few days ago,
several of them don't work; pick them up, no dial tone. (Confirmed with
a good set which I used to test all the jacks.)
But get this: while I was there, at least one of the phones that doesn't
work (a wireless phone) rang on an incoming call. WTF?!?!? It rang, but
when picked up--nothing, dead. No dial tone trying to make a call.
Anyone familiar with the inner mysteries of the telephone system care to
try to 'splain this? How could a phone not work, but still ring on an
incoming call?
You didn't mention this: What happens if you move a non-working phone to
where a working phone is? Does it now work? If so, then it's a wiring
issue. Otherwise, it's the phone itself.
Well, I didn't test that, but I did the reverse test which shows that
the problem is the wiring, not the phone: I took a working phone (a
regular, non-cordless phone) and plugged it in to a non-working phone
jack. It was dead, so the problem appears to me to be the wiring.
The phone that rang on an incoming call, by the way, was a cordless
(i.e., powered) phone, which tends to confirm the diagnosis someone else
here gave of a "DC open", a corroded connection that would pass enough
of the higher ring voltage to make the phone ring, but not enough to go
"off hook".
--
The fashion in killing has an insouciant, flirty style this spring,
with the flaunting of well-defined muscle, wrapped in flags.
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There is probably a break in L1 or L2 at a daisy chained jack. Down
stream of the break, there is no DC path for loop current to trigger
dial tone, BUT, since the ringer is AC, there can be a path back
through the ringer of a phone bridging the break [effectively two
phones in series] so the phone could ring, but not close the DC loop
when taken off hook.
Neil S.