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ECE 734

Stop and Wait Flow Control. Source transmits frameDestination receives frame and replies with acknowledgement (ACK)Source waits for ACK before sending next frameDestination can stop flow by not sending ACKWorks well for large frames and short data pathsInefficient for small frames and/or long d

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ECE 734

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    1. ECE 734 /834 Data Network and Communications Chapter 7 Data Link Control Protocols - Sliding Window Flow Control

    2. Stop and Wait Flow Control Source transmits frame Destination receives frame and replies with acknowledgement (ACK) Source waits for ACK before sending next frame Destination can stop flow by not sending ACK Works well for large frames and short data paths Inefficient for small frames and/or long data paths

    3. Fragmentation Large block of data may be split into small frames Limited buffer size Errors detected sooner (when whole frame received) On error, retransmission of smaller frames is needed Prevents one station occupying medium for long periods Stop and wait becomes inadequate

    4. Sliding Windows Flow Control Allow multiple frames to be in transit Receiver has buffer W long Transmitter can send up to W frames without ACK Each frame is numbered ACK includes number of next frame expected Sequence number bounded by size of field (k) Frames are numbered modulo 2k

    5. Sliding Window Diagram

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