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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.
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