Archived from groups: comp.dcom.voice-over-ip (
More info?)
Jeremy wrote:
> Dan wrote:
>
>> Can a Home Alarm System work over VoIP? If so, how? My home's alarm
>> system is monitored by a company that requires phone connection. I've
>> been attempting to come up with a solution, but without success. Any
>> assistance you can provide would be appreciated!
>>
>> Thanks in advance!
>> Dan
>
>
> Theoretically it can work, assuming that the power is on, that your
> Internet connection is active, etc.
>
> Problem is that VoIP circuits do not have the track record of POTS lines
> yet. What if there were a real emergency, such as a fire, and your
> power lines were out? What if your Internet connection was experiencing
> temporary down time?
>
> The most secure type of phone connection is called "Derived Channel,"
> and is a supervised connection. I do not know if the service is still
> offered, because it involves piggybacking a signal on top of one's phone
> line. The phone company thus knows if the line is cut, and can notify
> the alarm monitoring station of a possible problem.
>
> Burglars often would cut the phone line before breaking into a home,
> thus making it impossible for the alarm systems to report to the central
> station.
>
> I know of some alarm manufacturers that offered a cellular backup. The
> alarm would first try to dial out on the POTS line, and would use the
> cell as a backup. Unfortunately, the subscriber had to pay a monthly
> cell bill, and the cell service was virtually never used.
>
> The best circuits are called McCullough Loops, which are supervised
> 24/7. Underwriters Labs certifies these for banks, jewelry stores and
> other critical applications, where there must be assurance that the line
> is working.
>
> FOR THE MONEY your best bet is to keep the alarm hooked into a regular
> POTS line right now. It may be relatively primitive, but POTS lines
> have the best overall reliability record, over cellular and VoIP. If
> you can accept the higher risk associated with a VoIP connection with
> your alarm company, you might save a few bucks, but how much would it
> cost if you kept a POTS line, dumned down to only the most basic
> service, used only for the alarm? In an emergency, it could also be
> used if your VoIP line went down.
I appreciate your time and full analysis. This is good info. Just
wanted to also let you know that since my recent addition of fiber to
the house Verizon has already connected by POTS line to the same
terminal as my computer, etc. Everything goes through the fiber now.
That being said, I'm sure some conversion takes place before it's
converted over to fiber connection. Basically, Verizon took a pair of
copper wires, ran from the fiber terminal over to the POTS terminal and
that's how I remain on my "same" phone.
it just seems odd for me to pay $50/month for a copper phone line that
actually goes through my fiber line anyway. I may actually contact the
company that monitor's my alarm system to see if they have any IP type
system that might work.
The battery backup system will work for "a while" with the fiber, but
eventually turns it off so phone over fiber can be used for 911, etc.
The battery backup unit does have a terminal for a secondary power
source. I may actually find a way to use a real UPS to provide the
"long term" backup solution for that unit.
Again, this is in the future. I'm not converting this over now. Just
getting plans and knowledge so I can make an informed decision. I
certainly appreciate the time everyone has put into their responses.
VERY much good food for thought.
Take care!
Dan
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