Iris Management Suite
Technical Guide V1.7C 4/11/07
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In a small network, the router functionality is likely to be built into another unit,
e.g. on a home ADSL line it will be part of the combined ADSL
modem/router/firewall.
For outgoing calls from the IRIS dialler for polling or alarm transmissions, the
router receives IP packets from the dialler and translates the internal IP
address to the external IP address. It does the opposite for packets coming
back on the same call.
The problem with incoming calls is that the only IP addresses available
externally is the public IP address of the router. How does an external
application set up a connection to a specific device behind the router ?
This can be achieved by what is called port mapping within the router, but this
requires specific set up and detailed technical knowledge of the router. When
dynamic IP address assignment is used, or when there are multiple devices
on the private network behind the router, all of which need to be accessed
from time to time, this becomes very difficult or impossible to achieve.
The IRIS system solves this problem by using the Polling mechanism (which
uses outgoing calls) to carry back instructions to the IRIS dialler to make an
outgoing call to the address on the public network from which access to the
IRIS dialler or attached alarm panel is required. Hence the problem of making
incoming calls is avoided and through the polling mechanism the ARC can
help an installer who wants to gain remote access for maintenance etc.
11.1 Remote IRIS Dialler Configuration
An installer can configure IRIS diallers on site by making a serial data
connection to them from a laptop PC running IRIS dialler configuration
software provided by Chiron.
A special version of this software can also be used to accept an incoming call
from the dialler over the IP network. This call can be instigated by the ARC via
the Polling Engine. This is done by setting up the appropriate entries in the
Remote Access are of the Dialler Configuration window on the Console and
then updating the Polling Engines:
It is necessary to specify which Polling Engine will issue the command and
this will normally be the main Polling Engine for this dialler. When this Polling
Engine next receives a poll, it will issue the command and the dialler will make
the call to the IP address specified. Providing the installer has the IRIS
(34 strony)
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