Closed-circuit television (CCTV), also known as video
surveillance, is the use of
video cameras to transmit a signal to a specific place, on a limited set
of monitors. It
differs from broadcast television in that the signal is not openly
transmitted, though it
may employ point-to-point (P2P), point-to-multipoint (P2MP), or mesh
wired or wireless
links. Though almost all video cameras fit this definition, the term is
most often
applied to those used for surveillance in areas that require additional
security or
ongoing monitoring. Though videotelephony is seldom called "CCTV" one
exception is the
use of video in distance education, where it is an important tool
Analogue CCTV cameras record images to a digital recorder which converts
the
video to a digital format. To view the video, the DVR needs to be
connected
to a monitor or router to be broadcast through an internal network for
remote
access. However, there are government regulations for the strength of
analogue
signals