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ments the 2 Mbytes of on-board battery backed RAM. The purpose of the DCDM is to
provide a convenient, fast, easy to use, and reliable means of restoring a database to the
DCCP board. It is primarily used as:
a. a diagnostic tool to check for a faulty DCCP board
b. a means to allow defaulting the system database (e.g., to check for customer data-
base programming problems) while still preserving the original database, and
c. a means of restoring a specific database in 2-3 minutes to a new or existing DCCP in
support of a and b above.
Due to the fact that during a PCMMC database upload the system database is changing
over a 25 to 30 minute period, system call processing operation must be halted during the
upload process. Thus, an upload should only be done during periods of time when loss of
system call processing will not affect the customer's business operations (e.g., after work-
ing hours). Consequently, providing a DCDM allows a means for rapid restoration of a
system database (i.e., within a few seconds) without incurring this lengthy interruption of
system call processing capability. It should be remembered that specific entries in the
system database can always be changed using KMMC or PCMMC in the on-line mode
without incurring the loss of system call processing produced by a full or partial PCMMC
database upload.
D4SWD DAUGHTERBOARD
The DCCP must be provided with a D4SWD daughterboard to expand the system-switch-
ing matrix from 256 ports to 512 ports. However, adding this daughterboard also adds 16
DTMF receiver resources and a gain/loss controllable conference package to the system,
which allows the system to provide a higher quality conference arrangement for 4 and 5
party conference calls. Now, it is possible to provide the D4SWD daughterboard to the
DCCP simply to add the DTMF receiver resources and higher quality conference capabil-
ity without expanding to a second shelf. Thus, in future, expanding to a second shelf
becomes easy.
The DCCP has 4 DTMF receiver resources on-board, the DECP has none, and the MAP1
has 16 DTMF receiver resources on-board. Adding a D4SWD daughterboard to the DCCP
increases its and the system's DTMF receiver capability to 20 (i.e., 4 on-board plus 16 on
the D4SWD daughterboard). Adding a D4SWD daughterboard to the DECP adds 16 DTMF
receiver resources to the system total. Finally, adding a D4SWD daughterboard to the
DMAP1 board provides a total of 32 DTMF receiver resources to the system (i.e., 16
DTMF receivers on-board and 16 DTMF receivers provided by the D4SWD daughterboard).
DR2CID DAUGHTERBOARD
The DCS 400si 24-channel CID (Caller ID) detector daughterboard (DR2CID) mounts on
the DCCP, DECP or the DMAP1. The DR2CID provides up to 24 receivers for CID detec-
tion maximum when plugged on to the DCCP and/or DECP cards. When the DR2CID
daughterboard is plugged on to the MAP1 card, it will only provide 16 caller ID receivers
(i.e., since the on-board DTMF receivers already use 16 time slots and the entire board is
2.6
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