dry pair

Fri Aug 29 22:29:55 UTC 2003

>How would an alarm company get around this?  Would Qwest need 
>to run copper into the neighborhood if any one of the people 
>purchased an alarm?  If not, how would the alarm company get 
>the signal pushed through the fiber, and could that be done 
>with the dsl signal?

Most home/small business alarm systems use a digital dialer and use a
regular dial up phone line.
The alarm system dials the alarm monitoring station then uses a low
speed data protocol to report the alarm.
Of course if the line is cut the alarm can't get through.

For businesses that are required to have a monitored/dedicated line on
their alarm there is a newer technology called "DVACS" which uses a low
speed Frequency Shift F1/F2 modem to communicate alarms over a
voice-band private line.

Voice-band (300-3000Hz) private lines as well as 56K/64K DDS and ISDN
digital lines can be provisoned over most DLC/SLC fiber systems.

-Randy