Nortel DMS-100 Series Maintenance Manual page 49

backwards compatible with all POTS line cards compatible with the
NT6X54AA
different media access control (MAC) addresses for each xLC and DBIC
demultiplex 64 voice channels from receive data (RD) links to XLBUS
links
multiplex 64 voice channels from XLBUS links to transmit data (TD)
links
+12.7v CODEC reference to all 64 line positions
controls ring bus and automatic number ID (ANI)/COIN voltages using
relays
Any LCM line drawer that contains xLCs must have a DBIC. The following
figure illustrates the DBIC in the 1-Meg Modem Service.
DBIC in 1-Meg Modem Service
10BaseT or
100BaseT
Ethernet
The 1-Meg Modem Service supports four types of DBICs. Each DBIC
supports different transmission rates, Ethernet interfaces, and PMs. The
following table lists the DBICs supported by the 1-Meg Modem Service.
DMS-100 Family RLCM Maintenance Manual XPM12 and up
Maintenance overview 1-33
XLBUS
DBIC
xLC
xLC