Cabletron Systems EMM-E6 Ethernet manual Repeater Functionality

APPENDIX A: EMM-E6 SPECIFICATIONS

A.2 REPEATER FUNCTIONALITY

Delay Times

(port x in to port x out)

Start of Packet:	1,450 ns max.
Collision to JAM:	1,550 ns max.
Preamble
Input:	Minimum of 40 bits to a max. of 64 bits
	required.
Output:	64 bits min. (last 2 bits = 1, 1).
JAM Output:	If a collision occurs on one of the segments, a
	pattern of 1,0 is sent to the other 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 the collision detector of a segment is
	on for longer than approximately 2.4 ms. This
	FAULT protection will reset automatically
	after one packet is transmitted onto the
	FAULT protected segment without causing a
	collision.

A-2 EMM-E6 User’s Guide