UFC 4-021-02NF
27 September 2006
change 1, 23 October 2006
(tapes), reducing physical storage space, ease of search-and-playback functions, and
the capability to add watermarks for documenting evidentiary recordings.
4-8.3.3 Network Video Storage. An emerging trend in modern CCTV systems is the
capability to use network storage for video images. This enables the use of standard
hard disk arrays, such as a redundant array of independent disks (more commonly
known as a RAID array), a system of using multiple hard drives for sharing or replicating
data among the drives. The benefit of RAID over using drives singularly is increased
data integrity, fault-tolerance, and/or performance. RAID arrays offer the use of any
standard storage hardware instead of using a proprietary digital video recorder unit(s).
4-8.3.4 Data Servers. With the development of telecommunications equipment and
an oversupply of associated data centers, new companies are seeking novel market
opportunities for data storage. The trend in the industry is that a few specialized data
storage companies, that have the unique telecommunications engineering experience
and capital to build data centers or "server farms," are offering out-sourced data storage
services in the Terabit or Petabit range. While not totally mature, it can be expected that
secure methods of CCTV images will be the way of the future for CCTV security
systems.
4-9
4-9.1
A significant part of visibility is lighting. Lighting should enable parking lot
personnel and employees to note individuals at night at a distance of 75 feet or more
and to identify a human face at about 33 feet. These are distances that will allow them,
if necessary, to avoid the individuals or take defensive action while still at a safe
distance. Security lighting increases the effectiveness of guard forces and closed circuit
television by increasing the visual range of the guards or CCTV during periods of
darkness. It also provides increased illumination of an area where natural light does not
reach or is insufficient. Lighting also has value as a deterrent to individuals looking for
an opportunity to commit crime. Normally, security lighting requires less intensity than
lighting in working areas. An exception is at normal doorways.
4-9.1.1 Refer to UFC 3-530-01, Interior, Exterior Lighting and Controls for general
lighting guidelines. Refer to MIL-HDBK-1013/1A Design Guidelines for Physical Security
of Facilities for security lighting requirements.
4-9.2
Interior Lighting. Interior lighting for CCTV presents special issues that need
to be considered by the designer. For example, after-hours lighting may be significantly
lower than normal operation lighting. Two solutions help minimize this impact.
4-9.2.1 The first technique is the use of cameras with automatic backlight
compensation. Backlight compensation is a camera feature that enables the camera to
automatically adjust picture brightness depending on lighting conditions, which
compensates for bright backgrounds so foreground objects are not silhouetted.
Frequently, CCTV cameras near windows are affected by backlighting, causing
shadows and silhouettes, so the use of appropriate cameras with backlight
compensation is effective.
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