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Packet Switching and X.25 Networks. Page 15
Fig. 1.13 Retransmission caused by loss of frames and resultant Reject frame
Consider the conversation in Fig. 1.14. If we were now to wait for the
time required by the network, then the righthand side would acknowledge
receipt of all the data by sending an RR with N (R) of 4. Suppose that the
timeout has not expired and the lefthand side has more data to send,
what will happen? The lefthand side cannot send frame 4 because its
frame 5 has not been acknowledged. If it were to send frame 4 and receive
an RR with N(R) of 5 then either:
Fig. 1.14 Example showing lack of acknowledgement of frames and consequent closing of the transmission window
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Packet Switching and X.25 Networks
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