Nortel Networks Connecting the BCM50 system to the LAN, LAN ports on the main unit Sheet 1

154Chapter 17 Connecting the BCM50 system to the LAN and WAN

Connecting the BCM50 system to the LAN

On a main unit, three RJ-45 connectors support LAN connections and one OAM port. On the BCM50a main unit and BCM50e main unit, six RJ-45 connectors support LAN connections and one OAM port. Figure 59 shows the location of the LAN ports.

Figure 59 Ports on a BCM50e main unit

Router card

LAN ports

OAM port	LAN	por	Expansion/
(port 0)	(port 1)t		LAN ports
			(ports 2, 3)	Note: On units that have an integrated ADSL
				modem, the WAN port is an RJ-11 port and there
				are additional LEDs by the WAN port.

Table 31 describes the function and use of each of the ports.

Table 31 LAN ports on the main unit (Sheet 1 of 2)

Port name	Function
OAM port	The OAM port is used to connect an on-site management computer to the main unit.
	Using this connection, you can access management tools, such as Element Manager,
	without affecting the main LAN.
	This port is not connected to the network switch built into the main unit and cannot be
	used to connect other network devices.
LAN port	The LAN port is used to connect the main unit to the LAN.
	This port is connected to the network switch built into the main unit.
Expansion/LAN	The expansion ports are used for two purposes: connecting the expansion units and
ports	providing LAN access to other network devices.
	If there is an expansion unit connected to the port, the expansion port provides signaling
	channels, media channels, and LAN datagrams to the expansion unit. The expansion unit
	connects the signaling and media channels to the media bay module (MBM) and
	connects the LAN datagrams to the LAN port on the expansion unit. You can then use the
	LAN port on the expansion unit to connect network devices, such as IP telephones.
	If an expansion unit is not connected to the port, you can use the expansion port to
	connect network devices, such as IP telephones.
	The expansion ports are connected to the network switch built into the main unit. Any
	devices connected to these ports are on the same subnet as the device connected to the
	LAN port.

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