peater. Cabletron Systems reserves the right to change these specifications at any time
without notice.
GENERAL
Delay Times: (any segment in to all segments out)
From Port 2 Into Port 1.
Start of Packet:900 ns max.
Collision to JAM:1000ns max.
From Port 1 Into Port 2 Out
Start of Packet:850 ns max.
Collision to JAM:1550 ns max.
Preamble:
Input:
Minimum of 40 bits to a maximum of
64 bits
required.
Output:
64 bits minimum. (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 Required96 bits including preamble (Packet fragments are ex-
tended using the
JAM [1,0] data pattern.)
FAULT ProtectionEach segment will disconnect itself
from the other seg-
ment if 32
consecutive collisions occur, or if the
collision detector of a segment is on
for longer than 2.4 ms. This FAULT protec-
tion will reset automatically
after one packet is transmitted onto the
FAULT protected segment
without causing a collision.
FIBER OPTIC INTERFACE (PORT 1)
Parameter
Typical Value Worst Case
Receive Sensitivity-28.5
-27.0
Transmitter power is user selectable. The FR-3000 is shipped with transmitter power set
to the Low Mode.
Transmitter Power - Low Mode
