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AT-MR420T and AT-MR820T Installation Guide

Features

The AT-MR420T/AT-MR820T Micro Repeaters have incorporated the

latest technologies, including a custom Application Specific Integrated

Circuit (ASIC) and Surface Mount Technology (SMT). These result in

enhanced functionality, increased reliability, and improved

performance.

The AT-MR420T/AT-MR820T Micro Repeaters have the following

features:

❑ IEEE 802.3 compliant

❑ 10Base-T and Ethernet Version 1.0 and 2.0 compatible

❑ AUI port for connectivity to a network backbone as well as four/

eight twisted pair cable connections

❑ Automatic packet regeneration, error detection and correction

❑ Test link capability

❑ Auto partitioning and jabber lock-up protection

❑ Status and diagnostic LEDs

❑ Network Load LEDs

❑ UTP uplink port supported for network cascading

Packet Regeneration. Packet regeneration is a high-performance

network feature that includes the regenerating of the packet preamble,

retiming of data packets, and the extension of collision fragments.

Link Integrity. The IEEE 802.3 defined link integrity test function

continually monitors the twisted pair cable to ensure link continuity of

the receive pair between the user node and the repeater.

Auto Partitioning. Also known as segmentation, each segment is

automatically partitioned whenever 32 consecutive collisions are seen

on the segment. One valid packet will reset the segment and reconnect

it.

MRx20T(UTP)Ver6_Book Page 3 Thursday, April 3, 1997 5:18 PM

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