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Chapter 2:
SEH Features and Options
2-2 SEH100TX User’s Guide
2.1 SEH OVERVIEW
The SEH100TX-22 is a repeating hub providing 22 RJ45 ports and two
Ethernet Port Interface Module (EPIM) ports on the front panel for
network connections. The SEH has two rear panel Interconnect Bus ports
for stackable connections. The front panel EPIM ports support the
EPIM-100TX, EPIM-100FX, and the EPIM-100FMB. The
SEH100TX-22 is designed to be managed by the Cabletron Systems
intelligent stackable hub, the SEHI100TX-22.
2.2 SEH FEATURES
Repeater Functionality
The SEH fully conforms to the IEEE 802.3u Repeater specifications. The
SEH transmits retimed data packets, regenerates the preamble, extends
fragments, and arbitrates collisions.
The SEH100TX-22 meets IEEE 802.3u Repeater Class I standards.
Class I standards allow one repeater between any two Data Terminal
Equipment (DTE) devices within a single collision domain (network).
The SEH automatically partitions problem segments, and reconnects
repaired segments to the network. This feature minimizes the impact on
network operation resulting from a problem on one segment by isolating
the problem segment. Only devices on the problem segment are affected.
When the problem is solved, the SEH automatically reconnects the
isolated segment to the network.
Polarity Detection and Correction
Each twisted pair port on the SEH incorporates a Polarity Detection and
Correction feature which allows the SEH to pass data regardless of the
polarity of the receive link on the twisted pair segment.
!
CAUTION
The SEH100TX-22 operates in a 100BASE-T Ethernet
network. This product will NOT operate in a 10BASE-T
environment. Connect the SEH100TX-22 only to similar
100BASE-T products such as the SEHI100TX-22.
The SEH100TX-22 supports the EPIM-100TX, EPIM-100FX,
and the EPIM-100FMB. No other Cabletron Systems EPIMs
operate in this device.