Phase 2: Data Transmission
■Normal phase 2
The sending station first sends a transmission block containing the heading text. Each time the sending station receives an ACK from the receiving station, it sends a transmission block containing the data texts as shown below. Upon receipt of an ACK in response to the last transmission block (data text n), the sending station shifts to phase 3.
If a transmission message contains no data text, the sending station transmits the heading text only.
Sending station
Heading text
Receiving station
ACK
Data text 1
ACK
Data text
ACK
Data text n
ACK
To phase 3.
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