Cabletron Systems MR-2000C User Manual - page 5
Delay Times: (Port 1 Into Port 2 out)
Start of Packet:
1450 ns max.
Collision to JAM:
1550 ns max.
Delay Times: (Port 2 Into Port 1 out)
Start of Packet:
1150 ns max.
Collision to JAM:
1000 ns max.
Preamble:
Input:
Minimum of 40 bits to a maximum of 64 bits re-
quired.
Output:
64 bits min. (last 2 bits are 1, 1).
JAM Output:
A pattern of 1, 0 is sent to the other segment if a
collision occurs on one of the segments.
Minimum Packet Repeated:
96 bits including preamble (Packet fragments are
extended using the JAM [1, 0] data pattern).
FAULT Protection:
Each segment will disconnect itself from the other
segments if 32 consecutive collisions occur, or if
the collision detector of a segment is on for longer
than approximately 2.4 ms. This FAULT protec-
tion will reset automatically after one packet is
transmitted onto the FAULT protected segment
without causing a collision.
FRONT PANEL INDICATORS
PWR
Indicates that the repeater is receiving power.
XCVR PWR
Indicates that the repeater is providing power to the
transceiver connected to the repeater.
JAM
Indicates the MR-2000C is propagating a collision
on one segment to the other segment connected to
the repeater.
FRONT PANEL INDICATORS (CONT)
NOTE