What is a collision in a shared wired medium When a sender d

What is a collision in a shared wired medium? When a sender detects a collision during its transmission, what will the sender do? Why is a jam signal 32 bits?

Solution

1.Continue transmission (with a jam signal instead of frame header/data/CRC) until minimum packet time is reached to ensure that all receivers detect the collision.

2. Increment retransmission counter.

3.Was the highest number of transmission attempts reached? If so, abort transmission.

4.Calculate and wait the random backoff period based on number of collisions.

·         The jam signal or jamming signal is a signal that carries a 32-bit binary pattern sent by a data station to inform the other stations of the collision and that they should not transmit.

·         The maximum jam-time is calculated as follows: The maximum allowed diameter of an Ethernet installation is limited to 232 bits. This makes a round-trip-time of 464 bits. As the slot time in Ethernet is 512 bits, the variation between period time and round-trip-time is 48 bits (6 bytes), which is the maximum \"jam-time\".