Appendix Aspecifications; Repeater Functionality; A.1 Repeater Functionality - Cabletron Systems IRM-3 User Manual

The operating specifications for Cabletron Systems IRM3 are included in
this Appendix. Cabletron Systems reserves the right to change these
specifications at any time without notice.

A.1 REPEATER FUNCTIONALITY

Delay Times (Port x In to Port x Out):
Start of Packet:
Collision to JAM:
Preamble:
Input:
Output:
JAM Output:
Minimum Packet Repeated:
FAULT Protection:
IRM3 User's Guide
APPENDIX A
SPECIFICATIONS
1450 ns maximum.
1550 ns maximum.
Minimum of 40 bits to a maximum
of 64 bits required.
64 bits minimum (last 2 bits are 1,
1).
If a collision occurs on one of the
segments, a pattern of 1, 0 is sent to
the other segments.
96 bits including preamble (packet
fragments are extended using the
JAM [1, 0] data pattern).
Each segment disconnects itself
from the other segments if 32
consecutive collisions occur, or if
the segment's collision detector is
on for longer than approximately
2.4 ms. This FAULT protection
resets automatically after a packet
is transmitted onto the FAULT
protected segment without causing
a collision.
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