160 Chapter 17 Connecting the BCM50 system to the LAN and WANNN40020-302Connecting the BCM50 system to the LANOn BCM50 and BCM50b main units, three RJ-45 connectors support LAN connections and oneOAM port. On the BCM50a, BCM50e, BCM50ba, and BCM50be main units, six RJ-45connectors support LAN connections and one OAM port. The figure Ports on a BCM50e main uniton page 160 shows the location of the LAN ports.Figure 66 Ports on a BCM50e main unitThe table LAN ports on the main unit on page 160 describes the function of each port.Table 31 LAN ports on the main unit (Sheet 1 of 2)Port name FunctionOAM port The OAM port connects an on-site management computer to the main unit. Using thisconnection, you can access management tools, such as Element Manager, withoutaffecting the main LAN.This port is not connected to the network switch built into the main unit and cannot beconnected to other network devices.LAN port The LAN port connects the main unit to the LAN.This port connects to the network switch built into the main unit.Expansion/LANportsThe expansion ports have two purposes: connecting the expansion units and providingLAN access to other network devices.If an expansion unit is connected to the port, the expansion port provides signalingchannels, media channels, and LAN datagrams to the expansion unit. The expansion unitconnects the signaling and media channels to the media bay module (MBM) andconnects the LAN datagrams to the LAN port on the expansion unit. You can then use theLAN 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 toconnect network devices, such as IP telephones.The expansion ports connect to the network switch built into the main unit. Any devicesconnected to these ports are on the same subnet as the device connected to the LANport.LAN por(port 1)tRouter cardLAN portsNote: On units with an integrated ADSL modem, theWAN port is an RJ-11 port with additional LEDs.Expansion/LAN ports(ports 2, 3)OAM port(port 0)
