Cabletron Systems EMM-E6 Ethernet Manual De Usuario

APPENDIX A:  EMM-E6 SPECIFICATIONS

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.

CH1Book  Page 2  Wednesday, March 20, 1996  7:48 AM