Cabletron Systems SEHI100TX manual Sehi Features and Options

Chapter 2: SEHI Features and Options

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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 and the EPIM-100FX. No other Cabletron Systems EPIMs operate in this device.

2.2SEHI FEATURES

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.

2-2 SEHI100TX User’s Guide