Engineering

Guest

15 February, 19:06

Suppose that a wireless link layer using a CSMA-like protocol backs off 1ms on average. A packet's link and physical layer headers are always set at the same bitrate and take a total of 125us to transmit. If a packet is sent with a link layer payload of 1000 bytes at a bitrate of 1Mbps, what overhead do the physical and link layers introduce? Calculate overhead as the fraction of the complete packet time taken up by backoff and link/physical layer headers.