AS/NZS 62676.1.2:2020 pdf free download

09-03-2021 comment

AS/NZS 62676.1.2:2020 pdf free download.Video surveillance systems for use in security applications Part 1.2: System requirements – Performance requirements for video transmission (IEC 62676- 1-2:2013, MOD).
4 Performance requirements
4.1 General
This video transmission standard addresses the requirements of devices in security applications with differing application characteristics, such as embedded, PC based, operator workstations, and others. Digital encoding and decoding video devices, VSS client workstations, video storage, NVRs and DVRs have a differing set of functions in video streaming and network connectivity. The following summarizes these functionalities:
— stream encoding
— stream receiving and decoding
— stream recording
— live streaming and displaying
— playback streaming and replaying
— camera controlling
— health and status monitoring
— video content analysis
— metadata creation and streaming
— auxiliaries
Due to the nature of non-analog video transmission, especially video IP networks, using shared connections, compression and streaming techniques, following requirements shall be applied:
For different applications, such as PTZ camera tracking, recording, video motion detection, remote monitoring, etc., there are different requirements on the performance of VTDs. Therefore this standard introduces different performance classes. For each application the requirements shall be specified and include classes for: time service accuracy (Table 1), interconnection timing (Table 2), throughput sharing (Table 3 and 4), streaming (Table 5), network jitter (Table 6) and monitoring (Table 7).
Different functions of the system can have different performance classes.
NOTE Performance classes are independent of security grades.
These requirements do not apply to mobile cell based interconnections, but shall be applied to
fixed wireless network connections and transport applications, such as on-board systems.
If minimum requirements on the network performance for the proper operation of a VTD or
VSS exist, these shall be defined and documented.
The requirements start at a lower class 1 and grow with the classes, the higher the number.
4.2 Network time services
4.2.1 General
The Video Transmission Device (VTD) will require network time services for a real-time clock, eventing, logging and for the video transport stream (TS).
The VTD shall never start streaming video for recording purposes, if the requirements below on the accuracy of the time stamping of the video frames cannot be granted. This shall especially be verified after start-up or re-initiation after power loss of the VTD. Otherwise the integrity of the stream recordings may be corrupted and may not allow the correct replay not only of the concerned frame sequences, but also of other recordings. This has even higher impact on images used for the evidential purposes.
4.2.2 Real-time clock
The real time clock in the Video Transmission device should be synchronized with a time normal using RFC 2030, Simple Network Time Protocol (SNTP) Version 4 for lPv4, lPv6 and OSl. The addresses of the SNTP servers should come from the Time Server DHCP option (4). The more accurate system time shall be used as default: the SNTP best accuracy is 0,25 p5, whereas the usage of the ‘Time Server’ according to RFC 868 offers only a best accuracy of
1 5.
4.2.3 Accurate time services for the transport stream
As an option, Network Time Protocol (NTP) (Version 3) as detailed in RFC 1305 should be implemented when time services with an accuracy of I ms to 50 ms according to the requirements of Table 1 are needed. The IP addresses of the time servers should come from the Network Time Server DHCP option (42). The Network Time Protocol should be tried first and only on failure shall Simple Network Time Protocol be used. A null Network Time Server DHCP option (42) means no server is available and Simple Network Time Protocol should be used.AS/NZS 62676.1.2 pdf download.

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