Common Control Cards
8-7
DBM
8
8.3
DBM
3
The DBM (Database Module) memory expansion card is a component of the Coral
common control section that expands the database memory space used for storing the
system configuration. The DBM card requires Coral Software version 15 or higher or
any Coral Wave Gateway version. See
The DBM card includes either 2MB, 4MB, or 8MB of Static Random Access Memory
(SRAM), used to store the configuration database of a Coral system. The
configuration database determines the individual characteristics of a particular
installation site. Up to two DBM cards can be mounted onto a main control processor
MEX-IP2 card.
The DBM memory is protected by the lithium energy cell, located on the MEX-IP2
card, which continues to supply power to the SRAM when power to the Coral system
is removed. When the battery voltage is low, the diagnostic software displays a
warning message.
The DBM does not occupy a card slot within the Coral system unit. Rather, it is
installed as a baby card onto memory interface connector on the MEX-IP2 card. The
DBM card is equipped with an extension connector on the top side that extends the
memory interface connector from the main control processor card, allowing for
another DBM or MAP card to be connected on top of it.
Most Coral systems do not require a DBM at all. Special applications may require a
single DBM, and rarely would any system configuration require more than one DBM
card.
1
General Information
Once the system database has been installed, the DBM is powered by a backup battery
positioned on the main control processor MEX-IP2 card. Removing the DBM cards
(“upper” and/or “lower”) from the main control processor card will cause data on the
DBM card to be lost. Doing so will cause the Coral system to malfunction.
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