Home' RTCA Documents for Review : DO-230H FRAC Contents 192
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critical video streams, especially video streams with no event motion which are time-perishable, may be a
cost-effective solution but that is for each airport to decide.
Data considered by an airport to contain sensitive information which is to be sent to an offsite storage
facility should be encrypted to protect against deliberate or accidental data transmission exposure or data
center security breach.
Video server (such as NVRs) requirements depend on the IT network architecture. Three functions –video
compression (if the server is performing this), video analytics or other video-oriented value-added services,
and video management – will largely determine server performance requirements and specifications.
The preferred location for video compression is at or near the video cameras, to reduce network bandwidth
requirements, however, many facilities have analog runs all the way back to a central room with many racks
of encoders and recorders. Video analytics can be done either in an IP camera, or in an encoder near an
analog camera, or in a rack-mounted encoder in a distributed closet, or centrally on a server in a climate
controlled and physically secure and continuously monitored IT room with UPS.
When video compression and video analytics are performed in distributed telecom rooms or in a data center,
camera streams for each segment of the security system should be allocated across multiple servers to avoid
the loss of video imagery because of a server failure. Due to the smaller numbers of devices in a given
distributed room, it may be harder to have redundant failover devices on standby; however, by centralizing
devices in one room the economies of scale do permit redundant devices.
Server processing power and storage should be sized to perform video analytic functions and video
compression with 30 to 40 percent spare capacity to allow for future growth, particularly in video analytics
which can be computationally intensive. Servers should have hot swappable hard drives, codec boards or
modules, and dual power supplies. Isolating the OS from the video storage increases system performance
and reliability. The choice of single or multiple processors should be based on computational and reliability
In distributed telecom rooms and data centers, video management and storage functions may be run on
servers which also perform video analytics and storage management. All of these functions may be provided
as an integrated software package from a single vendor, or video analytics and compression may be supplied
separately to be run under the supervision of a video management package.
Video Management Systems (VMS)
A Video Management System is the infrastructure and tools for the management of video surveillance
systems, including the recording, transmission, viewing, analytics and event management of video, audio
and other data. It seamlessly supports audio and video inputs from Digital Video Recorders (DVRs),
Networked Video Recorders (NVR) or both. It is often integrated directly to access control systems so that
alarms may be exchanged and video tagged as events occur.
Invariably the VMS has a central database for consistent configuration of site equipment and user data. The
centralized management needs to be available from remote locations over the network.
For viewing video on remote monitors and for the easy control of PTZ cameras using dedicated CCTV
keyboards, VMSs provide virtual matrix features and capabilities.
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