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When the sender is responding to this event it cannot

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3 is the response to one single event. When the sender is responding to this event, it cannot accept the triggering of other events. This means that when ACK 2 arrives, the sender is still busy with sending frame 3. Example 11.7
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1 23 The physical layer must wait until this event is completed and the data link layer goes back to its sleeping state. We have shown a vertical line to indicate the delay. It is the same story with ACK 3; but when ACK 3 arrives, the sender is busy responding to ACK 2. It happens again when ACK 4 arrives. Note that before the second timer expires, all outstanding frames have been sent and the timer is stopped. Example 11.7 (continued)
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1 24 Figure 11.17 Flow diagram for Example 11.7
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1 25 Stop-and-Wait ARQ is a special case of Go-Back-N ARQ in which the size of the send window is 1. Note
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1 26 Figure 11.18 Send window for Selective Repeat ARQ
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1 27 Figure 11.19 Receive window for Selective Repeat ARQ
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1 28 Figure 11.20 Design of Selective Repeat ARQ
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1 29 Figure 11.21 Selective Repeat ARQ, window size
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1 30 In Selective Repeat ARQ, the size of the sender and receiver window must be at most one-half of 2m. Note
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