Cabletron Systems MMAC-Plus 9T125-24, User Manual

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1-1
Chapter 1
Introduction
The 9T125-24 Module MicroLAN™ Switch Module, shown in Figure , is a
three-port Token Ring switch module. This module supports two separate front
panel Token Rings with twelve HUB connections, and an interface to the FNB
backplane.
Features
Processor
The 9T125-24 Module is equipped with an advanced Intel i960 microprocessor.
This microprocessor provides a platform for all management functions within a
scalable RISC-based architecture.
System Management
Interfaces to the two System Management Buses (SMB-1 and SMB-10) for
intermodule management.
Connectivity
The 9T125-24 provides twenty four RJ45 Trunk Coupling Unit (TCU) lobe
connectors.
SRT Packet Switching
SRT Bridging occurs between the front panel Token Ring connections and SR-TB
bridging to any other module in the chassis via FNB -1 or FNB -2 of the FNB bus.
The module is capable of Transparent Bridging and/or Source Route Bridging.
IEEE 802.1d Spanning Tree Protocol is supported in all bridging functions.
Translational bridging between Source Routing and Transparent Frames types is
also performed for packets destined for the FNB.