Jam signal and collision detection
i figure that a jam signal would cause the receiving NIC to detect a bad CRC and reject the frame.
but i'm wondering about the purpose of the jam signal in relation to the transmitting NICs. Given 2 transmitting NICS A and B - does A's jam signal trigger the backoff in B's NIC. Or is B's backoff only triggered by its(B's) own collision detection?
one site says that a jam signal is required because although the collision will propagate, the collision loses energy(current/voltage?) and may not reach the transmitting NIC that is further from the collision. So the jam signal ensures that the transmitting NIC that is further away knows that a collision has occurred. and i imagine that implies that A's jam signal received by B will trigger backoff in B
read more and respond »Posted 5 years ago by jameshanley39 in Cisco Systems
