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White Paper on IP Signaling Alarms - Part 2
- Subject: White Paper on IP Signaling Alarms - Part 2
- From: "Mark McCall" <lists@xxxxxxxxxxxxxxxxxxx>
- Date: Thu, 31 Jan 2008 10:36:10 -0000
Submission by Steve Nut, IP Alarms Ltd
We often hear that one of the great advantages of IP over PSTN is the
increased speed of alarm signal transmission. Whilst this is partly true,
alarm installers need to understand the different stages of an alarm signal
transaction in order to take full advantage of this available speed.
Typically, from the time an alarm panel is activated, it takes
approximately
10-15 seconds to dial the telephone number and send a DTMF or FSK signal
over a PSTN line. When an IP dialer capture device is used, it listens for
the telephone digits, ignores them, plays a handshake, takes the signal,
plays a kiss-off and then transmits the signal over IP. Even though the
actual transmission over IP might take only a couple of hundred
milliseconds, the whole process takes approximately the same time as it
does
over PSTN. So where is the speed advantage in using IP...?
http://tinyurl.com/38mohy
M.
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