7 Installation – Backup Transmission over GSM
GSM can be used as a backup for alarm transmission, providing an alternative
route to the ARC.
Polling does not operate over GSM as this would incur high call charges.
The procedures described in this section are in addition to those described in the
previous installation section.
7.1 Preparation Prior to Installation
1. A SIM card supporting GSM voice calls is required.
7.2 Physical Installation and Checking Network Connection
1. Installation is as for GPRS as described above.
Note – the IRIS Dialler must always be disconnected from power when
inserting or removing the SIM card otherwise damage to the SIM card
can result.
7.3 Alarm Transmission
1. Transmission over GSM is selected by configuring the alarm dialler with one
of two leading digits before the telephone number as with PSTN and ISDN.
‘9’ – the IRIS Dialler will route the call over GSM only if PSTN and
ISDN are not available. This facility is used for standard GSM
backup of PSTN or ISDN lines.
‘7’ – the IRIS Dialler will route the call over GSM whether or not PSTN
or ISDN are available. This facility allows a second number
programmed in the alarm dialler to force a backup over GSM to
overcome possible situations where a PSTN line is available but
has been ‘locked’ by an incoming caller.
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