Cabletron Systems SEH100TX-22 manual SEH Overview, SEH Features

Chapter 2: SEH Features and Options

2.1SEH 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.

The SEH100TX-22 operates in a 100BASE-T Ethernet

!network. This product will NOT operate in a 10BASE-T

CAUTION	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.

2.2SEH 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.

2-2 SEH100TX User’s Guide