Tadiran Telecom Coral IPx Office, Installation And Hardware Reference Manual, Page: 303 / 510

Coral IPx Office Installation Manual Common Control Cards
8-43
DBM Car
d
8
8.7
DBM Card
2
The DBM memory expansion card is a component of the Coral IPx Office common
control section. The DBM integrates 4MB or 8 MB of Static Random Access Memory
(SRAM), used to store the configuration database of a IPx Office system. The DBM
is an optional card that expands the database memory space. The configuration
database determines the individual characteristics of a particular installation site.
Figure 8-17 displays the DBM card layout. The label at the bottom of the card that
reads “DBM-8”, indicates that the DBM card is supplied with 8MB of memory
(1 MByte per chip).
Figure 8-17 DBM-X Card
Layout
SRAM devices require a constant source of power to retain their memory. Power to
maintain the memory is ordinarily provided by the IPx Office system in which the
DBM is installed. Backup voltage is supplied by the MCB Office lithium battery.
The DBM does not occupy a card slot within the IPx Office system unit. Rather, it is
installed as a baby card onto a memory interface connector on the MCB Office main
processor card. The P1 connector on the DBM card is installed onto the P13 connector
of the MCB Office card. See
Figure 8-18 . The DBM connectors are not compatible
with the DBM connectors. Only one DBM card can be installed in the IPx Office unit.
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1 General Information
DBM-8
Holes for screws
Connector P1
Memory chip (1 Mbyte/chip)