Nortel Networks BCM200/400 - Manual (Page 44)

44 Chapter 2 Introducing the BCM hardware
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Figure 11 BCM400 MSC components
Table 7 MSC faceplate optional connectors
Connectors Description
DS256 connector (BCM400) The BCM expansion unit connects to the BCM main unit through the DS256 jack on
the MSC faceplate. The DS256 cable to make this connection is provided with the
purchase of a BCM expansion unit.
Auxiliary ringer jack The BCM system uses the auxiliary ringer jack to control the cadence of an auxiliary
ringer (customer supplied). You must use this output in a low current, low voltage
application only. Do not use this output for switching the auxiliary ringer directly.
Page relay jack When you use the page signal output jack to connect an external paging amplifier,
you also use the page relay jack. The page relay jack connects a floating relay contact
pair. The BCM system uses this jack to control the external paging amplifier.
Page output jack The BCM system uses the page output to connect an internally generated voice
paging signal to an external paging amplifier (customer supplied).
Music-on-hold jack The BCM system uses the music-on-hold input to connect an external music source
that supplies a signal to held lines (music-on-hold) or telephone speakers
(background music). The input source can be any available radio or music source
approved for connection to the network.
For directions on setting up these features, refer to “Installing optional telephony equipment” on page 181 .
Warning: External equipment connected to the auxiliary ringer, page relay, page output,
and music-on-hold interfaces must use safety extra low voltage (SELV). All four
interfaces are (SELV) and the external equipment connected to these interfaces must be
SELV. If these interfaces are not SELV, you must use external line isolation units (LIU).
Bracket press plate
PCI connector
Auxiliary ringer
Page relay
Page output
Music-on-hold input
PEC III (4 slots)
Mounting
screw
holes
DS256 (to expansion unit)
DS256 interface (connect
to MBM backplane DS30
connectors)
Lanclet tab