Nortel Networks 400 4.0 User Manual

Chapter 2 Introducing the BCM hardware

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The base function tray installs in the main unit and houses the main card with the system 
interfaces.

 illustrates the base function tray layout (BCM200 configuration shown). 

describes the internal components.

Figure 9   Base function tray internal components

Table 5   Base function tray faceplate component descriptions

System status LEDs

The system status display LEDs indicate the current status of the hardware 
components (see 

Reset button

The reset button restarts the BCM system.

WAN card

The WAN card (field upgrade) connects the BCM system to the wide area network 
(WAN). See 

Media services card (MSC)

The MSC performs call processing and media processing of the voice channels for 
the BCM system. See 

.

USB (universal serial bus) 
port

The two USB ports connect USB-compatible peripherals to the BCM system.

Modem port

The modem port provides PSTN dial-up access to the BCM system.

COM port (or serial port)

The COM port provides a serial connection to a laptop for maintenance purposes. 
See 

Ethernet port 2

Ethernet port 2 provides access to the internal local area network.

Ethernet port 1

Ethernet port 1 provides access to the external local area network.

MSC

System status LEDs

MSC mounting 
screws

PEC III 
slots

DS256 interface