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Video Streaming and Device Control Over Ethernet Standard

version 2.2

900 Victors Way, Suite 140 • Ann Arbor, Michigan 48108 USA • www.automate.org/vision

最新版

GigE Vision
®
 Specification  
version 2.2 
 
 
V2.2.00  Juin 22, 2022  Page 3 of 424 
 
 
Table of Content 
Introduction ............................................................................................................................................. 23 
1  Purpose ............................................................................................................................................ 23 
2  Technical Committee ...................................................................................................................... 23 
2.1  Version 2.2 .................................................................................................................................. 24 
3  Definitions and Acronyms .............................................................................................................. 25 
3.1  Definitions................................................................................................................................... 25 
3.2  Requirements Terminology ........................................................................................................ 26 
3.3  Acronyms .................................................................................................................................... 28 
4  Reference Documents ..................................................................................................................... 30 
5  Document Typographic Convention ............................................................................................... 32 
6  Liability Disclaimer ........................................................................................................................ 33 
7  System Overview ............................................................................................................................ 33 
PART 1 – Device Discovery ................................................................................ 36 
Device Discovery Summary ................................................................................................................... 37 
1  Overview ......................................................................................................................................... 37 
2  Goals ............................................................................................................................................... 37 
3  Scope ............................................................................................................................................... 38 
Physical Link Configuration ................................................................................................................... 39 
1  Single Link Configuration .............................................................................................................. 40 
2  Multiple Links Configuration ......................................................................................................... 40 
2.1  Load Balancing Considerations .................................................................................................. 41 
3  Link Aggregation Group Configuration ......................................................................................... 41 
3.1  Network Interface ....................................................................................................................... 42 
3.2  GVCP Impacts ............................................................................................................................ 42 
3.3  GVSP Impacts ............................................................................................................................. 42 
3.4  Static LAG vs Dynamic LAG ..................................................................................................... 43 
3.5  Events for LAG ........................................................................................................................... 43 
IP Configuration...................................................................................................................................... 44 
1  Protocol Selection ........................................................................................................................... 44 

GigE Vision
®
 Specification  
version 2.2 
 
 
V2.2.00  Juin 22, 2022  Page 4 of 424 
 
 
2  Persistent IP .................................................................................................................................... 46 
3  DHCP .............................................................................................................................................. 48 
3.1  DHCP Retransmission Strategy .................................................................................................. 49 
3.2  DHCP Lease Expiration .............................................................................................................. 50 
4  Link-Local Address ........................................................................................................................ 50 
Device Enumeration................................................................................................................................ 52 
1  GVCP Device Discovery ................................................................................................................ 52 
1.1  Broadcast Device Discovery ....................................................................................................... 53 
1.2  Unicast Device Discovery........................................................................................................... 53 
1.3  Associating the Device to the Enumeration List ......................................................................... 53 
2  Zeroconf Discovery ........................................................................................................................ 53 
2.1  Multicast DNS (mDNS) .............................................................................................................. 55 
2.2  DNS Service Discovery (DNS-SD) ............................................................................................ 56 
Device Attachment and Removal ........................................................................................................... 60 
1.1  Removal ...................................................................................................................................... 60 
1.2  Attachment .................................................................................................................................. 60 
PART 2 – GVCP ................................................................................................... 61 
GVCP Summary ..................................................................................................................................... 62 
1  Overview ......................................................................................................................................... 62 
2  Goals ............................................................................................................................................... 62 
3  Scope ............................................................................................................................................... 62 
GVCP Transport Protocol Considerations .............................................................................................. 64 
1  UDP................................................................................................................................................. 64 
1.1  Fragmentation ............................................................................................................................. 64 
1.2  Packet Size Requirements ........................................................................................................... 65 
1.3  Reliability and Error Recovery ................................................................................................... 65 
1.4  Flow Control ............................................................................................................................... 69 
1.5  End-to-End Connection .............................................................................................................. 69 
The Channel Concept .............................................................................................................................. 70 
Control Channel ...................................................................................................................................... 73 
1  Control Channel Privileges ............................................................................................................. 74 

GigE Vision
®
 Specification  
version 2.2 
 
 
V2.2.00  Juin 22, 2022  Page 5 of 424 
 
 
2  Control Channel Registers .............................................................................................................. 78 
3  Opening a Control Channel ............................................................................................................ 78 
4  Closing a Control Channel .............................................................................................................. 79 
5  Control Channel Heartbeat ............................................................................................................. 80 
6  Controlling the Device .................................................................................................................... 81 
7  Use of Pending Acknowledge ......................................................................................................... 82 
Stream Channel ....................................................................................................................................... 86 
1  Stream Channel Registers ............................................................................................................... 86 
2  Tagging Data Block ........................................................................................................................ 87 
3  Opening a Stream Channel ............................................................................................................. 89 
4  Operation of the Stream Channel .................................................................................................... 89 
5  Packet Size Negotiation .................................................................................................................. 89 
6  Closing a Stream Channel ............................................................................................................... 91 
7  Multicasting .................................................................................................................................... 91 
8  Impact of Multiple Network Interfaces ........................................................................................... 91 
9  Traversing Firewalls or Network Address Translation Devices ..................................................... 92 
10  Unconditional Streaming ................................................................................................................ 92 
Message Channel .................................................................................................................................... 94 
1  Message Channel Registers ............................................................................................................ 94 
2  Opening the Message Channel........................................................................................................ 95 
3  Operation of the Message Channel ................................................................................................. 95 
4  Closing the Message Channel ......................................................................................................... 95 
5  Asynchronous Events...................................................................................................................... 96 
6  Multicasting .................................................................................................................................... 96 
7  Traversing Firewalls or Network Address Translation Device ...................................................... 96 
Device with Multiple Network Interfaces ............................................................................................... 98 
1  Impact on Control Channel ............................................................................................................. 98 
2  Impact on Stream Channels ............................................................................................................ 98 
3  Impact on Message Channel ........................................................................................................... 98 
Additional Concepts................................................................................................................................ 99 
1  Retrieving the XML Device Description File ................................................................................. 99 
1.1  Device Non-Volatile Memory .............................................................................................. 101 