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10 Chapter 2 System Overview
NN40020-200NN40020-200
BCM50 hardware
BCM50 main unit
The BCM50 main unit (with telephony only) provides call processing and simple data-networking
functions. It provides connections for 12 digital telephones, four (PSTN) lines, four analog station
ports, and 4 connections for auxiliary equipment (auxiliary ringer, page relay, page output, and
music source). The BCM50 main unit does not have a router, but it does have four LAN ports: one
is the OAM port for technicians, and the other three are for basic LAN connectivity.
A main unit contains the following field-replaceable units:
• 1 programmed hard disk
• 1 cooling fan
• 1 router card (BCM50a and BCM50e only)
Additional BCM50 hardware
The BCM50 expansion unit is a compact unit that accommodates the Media Bay Modules used by
other BCM platforms. The BCM50 main unit can support a maximum of two expansion units. See
“BCM50 expansion unit and media bay modules” on page 18 for more information.
BCM50 is available in six configurations:
• BCM50: The compact main unit, suitable for
networks where integrated data-routing
capability is not required or networks that
already have an IP network.
• BCM50a: Includes an ADSL router and an
extra expansion port.
• BCM50e: Includes an integrated Ethernet
router and an extra expansion port.
• BCM50b: Includes an integrated Dual ISDN
S/T BRI.
• BCM50be: Includes an Ethernet router and
a Dual ISDN S/T BRI.
• BCM50ba: Includes ADSL router and a Dual
ISDN S/T BRI.
For more information about the integrated
routers, see “BCM50e and BCM50a: BCM
systems with integrated routers” on page 13 or
“BCM50b, BCM50ba, and BCM50be: BCM
systems with integrated BRIs” on page 16.
For more information about BCM50 hardware,
see the BCM50 Installation and Maintenance
Guide.