Black Box LH8112A-S, LH8124A manual Using Expansion Modules, Expansion Module Overview, Chapter

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.

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