Allied Telesis AT-MR820TR - Manual (Page 25)

AT-MR420TR and AT-MR820TR Installation Guide
3
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