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|  reply to scuuder3
Re: [Packet8] My alarm dials out with DTMF, will this work?
said by scuuder3  :According to my alarm manufacturer my alarm system uses dtmf to dial out to the monitoring station. It is a two way communicator, so once it calls the monitoring station you can talk directly to the operator. I see no reason why this would not work with packet8, it does not appear to be a data call. am I right, will this work? Thanks Sorry, It is a data call. Similar to a fax machine set to high speed.
When your alarm system calls the monitoring system, it should seize the line (disconnect all house phones from the incoming telephone Co), then check for dial tone, then dial your monitoring station, wait for a handshake signal from the alarm receiver at your monitoring station, then transmit your account # and then the signal (fire alarm, burglar, panic...), then it should receive a Kissoff signal from the receiver. After all of this is accomplished (4 to 15 seconds) the voice module will take over and allow the central station operator two have two way communication with whom ever is at the alarmed site. That is how it is designed to work.
Now here comes voip, which can only be as good as your network connection. Not such a good idea.
The best alarm formats for voip are: [in order]
1. 4+2 slow format (most reliable using packets for transmission of signals) adds about 7 seconds to the transmission time.
2. SIA (most widely accepted format for fire alarms) very short transmission time.
3. Contact ID format (Designed for dummies and alarm companies that sell their subscribes) Digital short pulse that will have difficulty with dropped packets, latency, and jitter. Any one of these symptoms can cause a receiver to not send the Kissoff signal. This will cause the alarm system to call out the maximum amount of times programed into the alarm communicator by your alarm company and will probably cause the alarm system to display a failure to communicate trouble (FC).
Cure for contact ID: All UL listed alarm communicators manufactured in the last 15 years or so, must be capable of sending out in least 2 different formats. If the alarm company insists on using Contact ID format, then they can program the odd # back up attempts to transmit in 4+2 format, and this should eliminate the FC trouble.
Info on Contact ID: previously known as Point ID.
1.It was designed for 'Alarm installation for Dummies 101,' and alarm companies that trade or sell alarm monitoring subscriber contracts like Pork Belly futures are traded on the stock market.
2.It identifies the alarm condition using a 3 digit predetermined code instead of identifying the actual device that is in alarm or having a trouble condition.
3. It can run into the same issues that we are seeing with fax transmissions above ~14000 baud rate with voip.
Just my 2 cents! Hope it helps. |
