EST3 Installation and Service Manual

Security applications

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

2.12 EST3 Installation and Service Manual