Allied-telesis AT-MR820TR Manual do Utilizador descarregar pdf (Página 25)

AT-MR420TR and AT-MR820TR Installation Guide

Features

The AT-MR420TR/AT-MR820TR 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, improved

performance, and lower cost.

The AT-MR420TR/AT-MR820TR Micro Repeaters have the following

features:

❑ IEEE 802.3 compliant

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

❑ AUI and a BNC ports for connectivity to a network backbone as

well as four/eight twisted pair cable connections

❑ user-selectable AUI or BNC Backbone switch

❑ user-selectable Backbone Network Enable/Disable switch

❑ Network Load LEDs (network utilization)

❑ automatic packet regeneration, error detection and correction

❑ test link capability

❑ auto-partitioning and jabber lock-up protection

❑ status and diagnostic LEDs

❑ STP/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.

Jabber Lock-up Protection. Jabber lock-up protects the repeater from

being overrun with data packets by isolating segments with

transmitted packets that exceed the maximum packet length. That is,

MRx20TR(STP/UTP)_BookA Page 3 Thursday, April 3, 1997 5:24 PM

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