5 Installation – Backup Transmission over PSTN or ISDN
PSTN or ISDN can be used as a backup for alarm transmission, providing an
alternative route to the ARC.
Polling does not operate over ISDN or PSTN as this would incur high call
charges.
The procedures described in this section are in addition to those described in the
previous installation section.
5.1 Preparation Prior to Installation
1. For backup alarm transmission over a traditional PSTN or ISDN path, the IRIS
Dialler communicates with a standard alarm receiver at the ARC. The
telephone number of this receiver will be required.
5.2 Physical Installation
1. If alarm communication over PSTN is required connect the PSTN interface on
the IRIS Dialler to the PSTN service using the Grey cable provided. This cable
is terminated at both ends with an RJ11 plug and if the PSTN service is
connected via a terminal block or Krone strip, the cable can be cut and
stripped. The centre two cores should be used and the polarity of the
connection is not important.
2. If alarm communication over ISDN is required connect the ISDN network
interface on the IRIS Dialler to the ISDN service using the Black cable
provided. This cable is terminated at both ends with an RJ45 plug and this is
the standard interface for ISDN services.
3. Make sure all cable runs are routed so as the protected against tampering.
5.3 Checking Network Connection
1. If the PSTN connection is connected correctly, then the PSTN LED on the
IRIS Dialler will be steady. If the PSTN LED is flashing in a .5s/.5s cycle, then
the Dialler cannot see the 50V feed from the PSTN line – check the wiring.
2. If the ISDN LED on the IRIS Dialler is steady then the ISDN connection is
synchronised correctly. If the ISDN LED is flashing in a .5s/.5s cycle then
there is some problem with the ISDN network or the cabling.
5.4 Alarm Transmission Configuration
1. To select routing of an alarm transmission over PSTN or ISDN, place an extra
digit “9” in front of the ARC receiver telephone number programmed into the
alarm dialler. This tells the IRIS Dialler that it should route the call over PSTN
or ISDN. Note – this method operates based on the fact that an IP address
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