Cabletron Systems manual Introduction to SPMA for the SEHI-22/24 and SEHI-32/34, Chapter

Chapter 1

Introduction to SPMA

for the SEHI-22/24 and SEHI-32/34

How to use the SEHI User’s Guide; manual conventions; contacting Cabletron Technical Support; SEHI firmware versions supported by SPMA

The SEHI-22/24 and SEHI-32/34 are intelligent repeating hubs that provide front panel ports for network connections and a rear-panel HUBStack Interconnect Bus port for stackable connections. Both devices fully conform to the IEEE 802.3 Repeater, AUI, and 10BASE-T specifications, and provide the flexibility to connect networks using a variety of media via RJ45 twisted pair, SMA and ST fiber optic, thin coax, and AUI EPIM modules. All of the models are functionally identical; the only difference among them is the configuration of front panel ports: the SEHI-22 has 12 built-in RJ45 ports and one slot for an EPIM module; the SEHI-24 has 24 built-in RJ45 ports and two EPIM slots; the SEHI-32 has one 50-pin Champ connector providing 12 twisted pair segments and one EPIM slot; and the SEHI- 34 has two 50-pin Champ connectors providing 24 twisted pair segments and two EPIM slots. You can stack as many as four of Cabletron’s SEH non-intelligent hubs with one SEHI and the entire stack is counted as only one repeater hop. All SEHI models will transmit re-timed data packets, regenerate preamble, extend fragments, arbitrate collisions, and automatically partition problem segments.

NOTE

Since the devices covered by this User’s Guide are functionally identical, they will be jointly referred to throughout the text as the SEHI. Likewise, since the only differences in the windows for each device will be the device name (SEHI-22, SEHI-24, etc.) and the number of ports displayed, only the SEHI-24 windows will be shown.

Using the SEHI User’s Guide

Your SPECTRUM Portable Management Application (SPMA) for the SEHI-22/24 and SEHI-32/34 consists of a number of different applications, each of which provides a portion of the overall management functionality. Each of these

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