Nortel Networks BCM50 - Manual (Page 33)

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Installation and Maintenance Guide
Chapter 2
Introducing the BCM50 hardware
The Business Communications Manager 50 Release 2.0 (BCM50 2.0) provides private network
and telephony management capability to small- and medium-sized businesses.
The BCM50 system:
• integrates voice and data capabilities, IP Telephony gateway functions, and data-routing
features into a single telephony system
• provides telephony applications for use in a business environment
For information about the BCM50 hardware components:
• Main units on page 33
• BCM50 Expansion unit and media bay modules on page 38
• BCM50 hardware on page 48
• BCM50 components on page 50
• Field-replaceable units on page 55
• Telephones and adapters on page 56
Main units
The primary hardware component in the BCM50 2.0 system is the main unit. The six BCM50
main units are divided into two series: standard and basic rate interface (BRI). The BRI (or b)
series main units include BRI ports that replace the four analog lines (on the RJ-21 telephony
connector) on the standard series.
• Standard series
— BCM50 main unit (with Telephony only)
The BCM50 main unit provides call processing and simple data networking functions. It
provides connections for 12 digital telephones, 4 (PSTN) lines, 4 analog station ports, and
4 connections for auxiliary equipment (auxiliary ringer, page relay, page output, and music
source). The BCM50 main unit has no router, but it has 4 LAN ports: one is the OAM port
for technicians, and the other three are for basic LAN connectivity. See the figure
BCM50
main unit ports and connectors on page 35.
Note: The generic term “main unit,” used throughout this document, refers to any of the
six main units (BCM50, BCM50a, BCM50e, BCM50b, BCM50ba, and BCM50be)
available for a BCM50 system.
To indicate features specific to a particular variation of main unit, that variation of main
unit is clearly identified (for example, BCM50ba).