Re: ACNC Doorbell Fon question

["Robert L. Bass" <robertlbass@xxxxxxxxxxx>]

"Robert Green" <ROBERT_GREEN1963@xxxxxxxxx> wrote in message
news:aK-dnX9-9MwHvuXfRVn-oQ@xxxxxxxxxx
> "Robert L. Bass" <robertlbass@xxxxxxxxxxx> wrote in message
>
>> > I'm just worried that someone at the front
>> > door could manage to lock up the phone
>> > line.
>
>> The unit can't actually lock up the phone line.  It doesn't make or
> receive
>> calls.
>
> I'm just afraid of Mr. Murphy and his law.  I'm sure the designers did not
> intend any accidental cross-connections to occur, but I'm also sure the
> guys
> who designed those hanging walkways for the Hyatt Regency didn't intend
> for
> them to collapse when people decided to dance on them!

It wasn't the dancing that did them in.  The supports were "re-engineered"
by the construction company.  The original engineering would have held just
fine.  It was a PITA trying to assemble long, threaded support rods through
the multi-tiered walkways.  Someone decided to change the design to make it
easier to assemble.  The rest is history.

>> It synthesizes a different ring signal to the inside phones.
>
> That's good.  From what I've read each of the two door inputs generates a
> different ring tone to indicate which door is "ringing" the phone.  I hope
> the tones are different than the special tones I have for my anonymous
> call
> rejection package.

Without hearing your unit I couldn't tell you.  If you want, try one out on
the bench for a week or two without actually installing it.  If it doesn't
meet your needs I'll take it back.

>> While the alarm is using the phone to report an emergency it kills the
>> connection to the Doorbell Fon unit and phones.
>
> I'm always just a little bit leery of automatic line seizure devices.  I
> was
> in a situation once where I was talking to emergency services on the phone
> when the alarm system decided to seize the line and disconnect us.  It was
> not a pleasant experience.  I have two lines now, but it's still not a
> good
> thing to have happen.  I suppose it's too much to ask of a line seizure
> device to check and see if a 911 call is already in progress and not to
> interrupt it if it is.

That would make an interesting project.  It's certainly doable but nothing
currently on the market that I know of can do it.  Some alarms can be
programmed to terminate communications and release the line if a valid user
code is entered at the keypad.  Also, modern alarm reporting formats are
much faster than what we had to deal with a few years ago so interference
with voice calls is less of a problem.  It's still a valid concern but just
not as bad as it used to be.

--

Regards,
Robert L Bass

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