6 Installation – Backup Polling/Transmission over GPRS
GPRS can be used as a backup for polling and alarm transmission over IP
providing an alternative route to the Polling Engine/Receiver at the ARC. Alarm
transmission calls are routed to the same ARC receiver as would be used with
ISDN or PSTN.
The procedures described in this section are in addition to those described in the
previous installation sections.
6.1 Preparation Prior to Installation
1. A SIM card with GPRS support is required from the chosen GSM/GPRS
operator.
2. The operator will also provide what is referred to as an “APN” which is a name
(e.g. “orangeinternet”) of the gateway between the operator’s GPRS network
and the IP network. A User Name and Password may also be required.
These will be loaded into the IRIS Dialler.
6.2 Physical Installation
1. Connect the GSM antenna. Route the cable and fix the antenna so as to be
protected against tampering.
2. Insert the SIM card into the holder in the IRIS Dialler. If the cased version of
the Dialler is being used, the casing can be unscrewed with the four screws
under the self-adhesive feet to give access to the SIM card holder.
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.
6.3 Checking and Network Connection
1. The signal strength of the GSM connection can be examined using the Local
Configuration Software – see section below. The antenna should be
positioned to give best signal strength.
2. Before a GPRS connection can be made, the IRIS Dialler must register with
the GSM network. Until registration is complete, the GSM indicator on the
IRIS Dialler will flash on/off in a .5s/.5s cycle.
3. Enter the GPRS APN name, User Name and Password (as necessary) using
the Local Configuration Console (see section below).
4. If the LED stays flashing then the registration has not occurred. This could be
for a number of reasons:
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