Flow Control - Sliding Window

• Consider A to B on full duplex link

  • B allocates N frame buffers
  • each frame given sequence number
  • ack includes 1+ sequence# of last frame recíd
  • A can send N frames before receiving an ACK

. . . 0 1 2 3 0 1 2 3 0 1 2 3 0 1 2 3 0 1 2 3 0 1 2 3 0 1 2 3 ....

. . . 0 1 2 3 0 1 2 3 0 1 2 3 0 1 2 3 0 1 2 3 0 1 2 3 0 1 2 3 ....

sender

receiver

frames that can be sent

received

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