On Sat, 18 Nov 2006, Jerry Guritzky wrote:
Is it necessary to put a filter on the output jack of my
burglar alarm?
The DSL should be split off and a DSL filter placed BEFORE the
the input to the alarm system. You may want to check with the
alarm company to be sure there are no problems with their
particular system and DSL. They can also advise on wiring
configuration. Basically the DSL signal should be filtered out
out of the phone line before it enters the alarm system.
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<http://www.homephonewiring.com/splt-alarm.html>
"If you have an alarm system, you should use a splitter so that
the DSL data is separated from the voice signal that goes to
the alarm system RJ 31X jack. That prevents interference
originating in the alarm system connection from interfering
with the DSL service. It also allows the alarm system to seize
the voice line when an alarm condition exists, without dropping
the signal to the DSL modem. Using a splitter in your DSL
installation with a dedicated cable for the DSL data connection
also avoids sending the DSL signal over the alarm system phone
cable, which is normally low quality cable that is highly
susceptible to interference."
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