Chapter 1 Overview; Centrecom At-30Xxtr Multiport Repeaters; Concepts - Allied Telesis AT-3012TR Installation Manual

Chapter 1
Overview
CentreCOM AT-30 xx TR Multiport Repeaters

Concepts

CentreCOM AT-30xxTR Multiport Repeaters provide low-cost connection for
up to 24 IEEE 802.3 10BASE-T network segments. The series includes three
different models, featuring 12, 16 and 24 RJ45 port connections for 10BASE-T
networks.
In addition to the twisted pair interfaces, each unit includes a choice of two
network ports for interconnection to a network backbone:
An IEEE 802.3 10BASE5 Attachment Unit Interface (AUI) for
attachment to coaxial (thick) Ethernet or an external transceiver
A 10BASE2 BNC (Bayonet Nut Couple) port for attachment to thin
Ethernet
In this way, the repeater enables you to connect between the different media
(thick or thinnet coaxial, fiber optic and twisted pair) with the possible
addition of the appropriate transceiver.
The AT-30xxTR Multiport Repeaters utilize the latest technologies, including
a custom Application Specific Integrated Circuit (ASIC) and Surface Mount
Technology (SMT) which provide enhanced functionality, increased reliability,
and improved price and performance.
Packet Regeneration. Packet regeneration is a high-performance
network repeater 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 will be
automatically partitioned whenever 32 consecutive collisions or one
long collision consisting of between 125 and 3750 Bytes are seen on the
segment. One valid packet will reset the segment and return it to auto
reconnecting segment.
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