Using Expansion Modules 23
Chapter 2
Using Expansion Modules
Expansion Module Overview
Expansion modules provide additional functions such as internal bridging
of 10Mbps and 100Mbps segments and extended distances between
devices. The available modules are:
• Module LH8100C-2TX: 2 port Bridge or 10/100BASE-TX
Switch Module
• Module LH8100C-2FX: 2 port Bridge or 100BASE-FX
Fiber Distance Extender Switch Module
• Module LH8100C-3TX: 2 port Bridge and 10/100BASE-TX
Switch Module
• Module LH8100C-3FX: 2 port Bridge and 100BASE-FX
Fiber Distance Extender Switch Module
With the 10/100 Managed Hub, the software setting for Bridging Module
Admin State (external distance extender function and internal function) is
disabled by default. The Admin State of a bridge module must be config-
ured using Console or Web-Based Management after installation.
Internal Bridge Function
The Internal Bridge Function is used for bridging 10Mbps and 100Mbps
segments in a hub or in a stack. Only one internal switch can be enabled in
a 10/100 Managed Hub, more than one will cause network looping.
IMPORTANT: There can only be one internal switch enabled in a 10/100
Managed Hub, however multiple external bridges are allowed. Therefore,
if more than one module exists in a 10/100 Managed Hub, ensure that only
one module has its internal bridge enabled.
External Bridge Function
The external bridge function is used to extend the distance between
100Mbps hubs or stacks from the normal limitation of five meters to one
hundred meters with TX modules using RJ 45 cable. With FX modules
using fiber cable, you can expand the distance between hubs or stacks up
to 2km.
