
Iris Management Suite
Technical Guide V1.7C 4/11/07
21
7 Main and Backup Polling Engine
The combination of the IRIS Management Suite and IRIS diallers provides a
highly resilient alarm communication system with multi-path communication
options. As part of this, each remote dialler can operate with two Polling
Engines, of which one is treated by the dialler as the Main and the other is
treated as the Backup.
Each Polling Engine handles both polling and alarm transmission over the IP
network.
It is recommended that a community of IRIS diallers (e.g. those installed with
one large multi-site customer or those within a geographic region) is provided
with Main and Backup Polling Engines. These can be operated either as:
• Load Sharing - 50% of the IRIS diallers use one as Main, and 50% use
the other as Main.
• Hot Standby – one Polling Engine acts as Main for all the diallers and
the other sits on standby.
Of the above, Load Sharing is recommended as under no-fault conditions it
makes best use of network resources and as both Polling Engines are in
constant use it gives the ARC operator assurance that both systems are fully
operational.
There are two ways that IRIS diallers can be configured for operation with
Main and Backup Polling Engines:
• Determined by the configuration of the Alarm Panel by the installer –
on the Dialler Configuration window on the IRIS Console, the option
“Panel” is selected for Main and Backup.
• Determined by the ARC – on the Dialler Configuration window on the
IRIS Console, the specific Polling Engines to be used for Main and
Backup are selected.
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