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Chapter 2:
SEHI Features and Options
2-2 SEHI100TX User’s Guide
2.2 SEHI FEATURES
The SEHI operating features are as follows:
Repeater Functionality
The SEHI fully conforms to the IEEE 802.3u Repeater specifications. The
SEHI transmits retimed data packets, regenerates the preamble, extends
fragments, and arbitrates collisions.
The SEHI100TX-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 SEHI 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 SEHI automatically reconnects the
isolated segment to the network.
Polarity Detection and Correction
Each twisted pair port on the SEHI incorporates a polarity detection and
correction feature that allows the SEHI to pass data regardless of the
polarity of the twisted pair segment’s receive link.
FLASH EEPROMs
The SEHI uses FLASH EEPROMs that allow the downloading of new
and updated firmware using Cabletron Systems SPECTRUM Element
Manager/Windows or any device using BOOTP or TFTP protocols.
!
CAUTION
The SEHI100TX-22 operates in a 100BASE-T Ethernet
network. This product will NOT operate in a 10BASE-T
environment. Connect the SEHI100TX-22 and SEH100TX-22
only to similar 100BASE-T products.
The SEHI100TX-22 supports the EPIM-100TX, EPIM-100FX,
and the EPIM-100FMB. No other Cabletron Systems EPIMs
operate in this device.