Security applications
EST3 Installation and Service Manual 2.13
Multiple 3-MODCOM modules
You can install more than one 3-MODCOM Modem
Communicator module in a system. Two or more 3-MODCOM
modules can be installed in the same cabinet. Two or more
cabinets can contain 3-MODCOM modules.
There are several reasons for using multiple 3-MODCOMs:
• Redundant communication to a CMS
• Backup of critical communication links
• Dedicated security transmission hardware
In a redundant communication system both 3-MODCOMs are
programmed to transmit the same message to different receivers
at the CMS or at different CMS installations.
One 3-MODCOM can be programmed to back up another. This
guarantees CMS communication (or TAP paging) should one
panel in the system become disabled.
In a multiple tenant application, there may be a high volume of
ACDB/KDC program traffic. You can design such systems with
a second 3-MODCOM, dedicating the first module to
ACDB/KDC traffic, and the second module to CMS
transmissions. This prevents contention for communication
channels.
Overall limits for the number of 3-MODCOM modules are:
• 10 modules per node
• 10 modules total per network
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