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SENDER RECEIVER
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<--- <C>
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times out after 3 seconds,
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<--- <C>
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times out after 3 seconds,
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<--- <C>
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times out after 3 seconds,
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<--- <C>
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times out after 3 seconds,
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<--- <nak>
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<soh> 01 FE -data- <xx> --->
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<--- <ack>
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<soh> 02 FD -data- <xx> ---> (data gets line hit)
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<--- <nak>
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<soh> 02 FD -data- <xx> --->
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<--- <ack>
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<soh> 03 FC -data- <xx> --->
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(ack gets garbaged) <--- <ack>
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times out after 10 seconds,
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<--- <nak>
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<soh> 03 FC -data- <xx> --->
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<--- <ack>
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<eot> --->
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<--- <ack>
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Here is a data flow example for the case where the receiver requests
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transmission in the CRC mode and the sender supports the CRC option. This
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example also includes various transmission errors. <xxxx> represents the
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2 CRC bytes.
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Chapter 8 Xmodem Protocol Overview
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X/YMODEM Protocol Reference 10-27-87 26
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Figure 13. Receiver and Sender Both have CRC Option
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SENDER RECEIVER
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<--- <C>
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<soh> 01 FE -data- <xxxx> --->
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<--- <ack>
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<soh> 02 FD -data- <xxxx> ---> (data gets line hit)
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<--- <nak>
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<soh> 02 FD -data- <xxxx> --->
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<--- <ack>
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<soh> 03 FC -data- <xxxx> --->
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(ack gets garbaged) <--- <ack>
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times out after 10 seconds,
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<--- <nak>
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<soh> 03 FC -data- <xxxx> --->
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<--- <ack>
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<eot> --->
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<--- <ack>
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