Cabletron Systems SEHI-22/24 - Manual (Page 7)

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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.
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
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.