Video monitoring application - Wireless IP Camera

One video monitoring application uses on-site local networks and a second application uses the Internet and GSM Security camera , signal routers, and servers for remote site video monitoring. Security applications require complete integration of communication, video, alarm, access control, and fire to provide monitoring by the local security force, and corporate executives at a local or remote site(s). The integration of these security functions provides the safety and security necessary to protect personnel and assets at any facility.

 

The clarity of the picture transmitted using fiber optics is now limited only by the camera, environment, and monitoring equipment. Fiber-optic systems can transmit signals from a Wireless Security Cameras to a monitor over great distances— typically several miles—with virtually no distortion or loss in picture resolution or detail. The system uses an electrical-to-optical signal converter/transmitter, a fiber cable for sending the light signal from the camera to the monitor, and a light-toelectrical signal receiver/converter to transform the signal back to a base-band video signal required by the monitor. At both camera and monitor ends standard RG59/U coaxial cable or UTP wire is used to connect the camera and monitor to the system. The economics of using a fiber-optic system is complex. Users evaluating fiber optics should consider the costs beyond those for the components themselves. The small size, lightweight, and flexibility of fiber optics often present offsetting cost advantages. The prevention of unanticipated problems such as those just listed can easily offset any increased hardware costs of fiber-optic systems.

 

Broadband fiber-optic components are much more expensive than cable. They should be used when there is a definite need for them. Note also that video signals must be digitized to avoid nonlinear transmitter/receiver effects. Why use fiber-optic transmission when coaxial cables can provide adequate video signal transmission? Today’s high-performance video systems require greater reliability and more “throughput,” that is, getting more signals from the camera end to the monitor end, over greater distances, and in harsher environments. The fiber-optic transmission system preserves the quality of the video signal and provides a high level of security. The information-carrying capacity of a transmission line, whether electrical or optical, increases as the carrier frequency increases. The carrier for fiber-optic signals is light, which has frequencies several orders of magnitude (1000 times) greater than radio frequencies, and the higher the carrier frequency the larger the bandwidth that can be modulated onto the cable. Some transmitters and receivers permit multiplexing multiple television signals, control signals, and duplex audio onto the same fiber optic because of its wide bandwidth.

 

With such rapid advances, the security system designer should consider fiber optics the optimum means to transmit high-quality television signals from high-resolution monochrome or color cameras to a receiver (monitor, Rear Mirror Camera , recorder, printer, and so on) without degradation. This section reviews the attributes of fiber-optic systems, their design requirements, and their applications. While the balanced transmission line offers many advantages over the unbalanced line, it has not been in widespread use in the video security industry. The primary reason is the need for transformers at the camerasending and monitor-receiving ends, as well as the need for two-conductor twin-axial cable. All three hardware items require additional cost as compared with the unbalanced single-conductor coaxial cable. The use of UTP transmission has become a popular replacement for the coaxial cable, or fiber optics.

More information at http://www.jimilab.com/  .