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Arrowcrest
Technologies Pte Ltd - Closed Circuit Television
Systems, CCTV Systems, CCTV Equipment, Security Systems
Arrowcrest Technologies Pte Ltd
Contact: Lynn
57, Genting Lane
#06-00 Gani Building
Singapore 349564
Tel: (65) 6742-2766
Fax: (65) 6742-0766
E-mail: [email protected]
Website:
www.arrowcrest-tech.com Categories: Closed Circuit Television Systems, CCTV
Systems, CCTV Equipment, Security Systems Company Profile: Singapore Security Equipment Company
suppliers of Closed Circuit Television Systems, CCTV
Systems, CCTV Equipment, Security Systems, Electrical & Electronic Materials,
Products & Components, Communication & Security Systems
Since
the events of September 11, many companies are
increasingly concerned about building security and
have started to investigate the functionality of
their security systems. With the use of a Closed
Circuit Television (CCTV) system (i.e., security
cameras), the pictures taken could prevent
terroristic threats to public and private
establishments.
Evolution of CCTV
Closed circuit television (CCTV) originated in the
1950s and consisted of two low-resolution black and
white cameras. Its main objective was to replace
humans for visual security surveillance. In the
1980s, solid state cameras and VCRs were introduced.
The resolution was better, but the pictures were
still in black and white. In the 1990s, came the
transformation to color, and eventually digital
video recorders (DVRs) were introduced. The DVR
allowed video to be recorded in higher resolutions
than VCRs and eliminated video tapes, which in turn
eradicated the need to physically change the tape.
As we venture into the new millennium, the purpose
of CCTV is broadening. The DVR is taking analog
video and converting it to digital. The digital
signal is then compressed using a variety of
different methods and sent over the network without
bogging it down.
Digital Video Recorders
The DVR's function is to capture images (from up to
16 cameras per digital recorder), compress them and
then store them on the DVR's hard drive. Since
images are stored on the DVR before the LAN, you are
not using any bandwidth until you retrieve or view
the video remotely.
IP Cameras
IP cameras are similar to DVRs in that they take
video, compress it and send it over the LAN. The
difference is that the IP camera does not store the
video. The IP camera is always streaming video
across the LAN to a storage device, possibly to the
storage area network (SAN). Therefore, the IP camera
is always using bandwidth. Because IP cameras are
the route to go today, a parallel or segmented
network is suggested. In the future, as different
compression methods are developed, it may be
possible to use IP cameras on a data network without
having bottleneck issues. However, some IP cameras
now incorporate both server and DVR functions and
limit some of the bandwidth impact.
Compression Technologies
There are many different compression methods out
there, including: MJPEG, H263, Wavelet, MPEG2/MPEG4
and JPEG-2000. The major difference between them is
the amount of bandwidth they consume. It is highly
probable that H263, MPEG2/MPEG4 and JPEG-2000 will
prevail in the security industry because of their
low bandwidth consumption. The Anixter Levels Lab is
currently testing DVRs and IP cameras to determine
which product is best for your LAN in terms of
bandwidth consumption. This will guarantee that the
security products installed on the LAN will not
cause bottleneck issues.
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