Black Box PCW22A-R3 Manual do Utilizador descarregar pdf (Página 26)

CHAPTER 4: Operation

Data Flow — A/S-2G to Asynchronous Device

Bisynchronous Device A/S-2G Converter Asynchronous Device

Send data block D

Send data block E

Retransmit block E

TTD

NAK

ACK 0

when available

Send block D

NAK

ACK 1 (when

correctly

received)

Send block E

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

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Black Box PCW22A-R3 Manual do Utilizador Página 26