Re: SIA, Contact ID, 4/2, 3/1

["Robert L Bass" <RobertLBass@xxxxxxxxxxx>]

"Michael" wrote:
>
> One thing I have thought about it is, that using the latest higher
> speed transmission format has it's own problem. How long does it
> take
> two modern modems to negotiate a connection? 5-10 seconds? It seems
> (from what I've noticed over the years), that the faster the
> overall
> transmission speed, the longer it takes to actually negotiate the
> connection and sync the signals...

There's a reason for that.  If you're using a multi-format receiver,
it sends each possible handshake tone, waits a second or two, tries
again (or not) and then sends the next one, repeating until the
communicator hears a tone it likes and begins transmitting.  I used a
number of different receivers over the years.  The last ones were O/H
QuickAlert II.  Because we used almost exclusively Ademco CID once it
became available, I had O/H make us a set of custom chips.  Our
receivers would first try Contact ID, then pulse, etc.  This shaved a
few seconds off the connect time for newer systems.

BTW, I said "receivers" as in two of them.  We were small.  We only
needed one 4-line receiver and another for backup.  O/H machines
rarely failed.  Other than when we tested it the backup receiver
never was used.

I don't know if newer receivers offer custom configuration.  Also,
the delay between trying various formats may be shorter (or longer).
You might want to inquire of your receiver manufacturer if there's an
option.  O/H was always very accommodating in the old days.  Now that
they've been "assimilated" (apologies to Bugs) they might not be so
responsive.  :^)

--

Regards,
Robert L Bass

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