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CHAPTER 4: Operation
25
Data Flow — A/S-2G to Asynchronous Device
Bisynchronous Device A/S-2G Converter Asynchronous Device
Send data block D
Send data block D
Send data block E
Retransmit block E
TTD
TTD
NAK
ACK 0
when available
Send block D
NAK
ACK 1 (when
correctly
received)
Send block E
NAK
NAK
If data not properly received by A/S-2G:
If data not yet available from synchronous device
while synchronous line to A/S-2G is engaged:
2-second interval from previous ACK
2-second interval
Continues until data available