Length of Contention Period = 2_

• worst case: longest delay before a collision is detected, let A, B be furthest apart stations

  __= propagation delay between them
  
  
  A transmits at t, B transmits at t + _ -
  (just before it detects the frame is busy)
  B detects collison, stops at t + _
  it takes an additional __seconds
  before A sees the collision and stops as well

• propagation delay depends upon cable length and throughput speed (1km ethernet ~ 5_s)

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