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why is the contention slot of csma/cd protocol is 2 ??

on 2011-04-29 21:42:16   by Prasanjeet   on MCA  1 answers

Anupam

on 2011-05-11 09:30:00  

A contention slot is the minimum time a host must transmit for before it can be sure that no other host packets has collided with the transmission.for CSMA/CD this must be twice the round-trip-delay(2*Td).This happens when a station at one end transmits at time=T which reaches a station at the other end at Td just when the station starts transmiting,leading to a collision.But the information about collision reaches the first station after Td,i.e,after 2*Td.Hence it is said that CSMA/CD protocole has a contention slot of 2.