DAP Technology 1394, Руководство по эксплуатации

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Audio Video / Control protocol (AV/C)
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Chapter 15. Audio Video / Control protocol (AV/C)
15.1. Recorder Protocol View
One of the protocols supported by the Protocol View of the Recorder is the Audio Video / Control (AV/C)
protocol. The AV/C protocol-analyzer software will scan through all transactions and packets to find
AV/C-compliant Units and it will fill the 'relations' pane in the AV/C tab-page with AV/C-related items
(including streams according to IEC 61883), as described in Protocol View and
Protocol Settings . An
example of the resulting Protocol View is displayed below.
It displays the result in three different parts. At the right (transactions and packets), all found packets and
transactions are displayed in the order they were detected on the bus. The left part (relations) shows the
relation between these items. The transactions and packets belonging together (e.g. all transactions that
form a single FCP command) are grouped into tree items and these items are displayed hierarchically in
the 'relations' pane. In this tree you will find for instance:
· FCP commands and responses
·
Channel allocation and de-allocation
·
Bandwidth allocation and de-allocation
· Plug register transactions
·
Isochronous-stream start/stop events
·
Bus resets
The details of the item selected in the relations tree, are displayed in the middle part of the Protocol View.
For the AV/C protocol it is called the 'Transaction/Isochronous-packet data'. It displays the fields defined
for the selected item and the values of those fields. The details of commands and responses are
formatted according to the specifications defined for the corresponding unit if that unit is supported by the
Analyzer. The following units are supported, unless information of descriptors is needed for the formatting
of the commands or responses (descriptors not yet supported):
·
AV/C Digital Interface Command Set General Specification Version 4.0
· AV/C Connection and Compatibility Management Specification 1.0
· AV/C Monitor Subunit Model and Command Set Version 1.0
·
AV/C Audio Subunit Specification 1.0 AV/C Printer Subunit Specification 1.0
· AV/C Tape Recorder/Player Subunit Specification - version 2.1