With the development of China's urbanization process and unexpected events occur repeatedly, unexpected events of city's public security and emergency system is more and more brought to the attention of the governments at all levels, one of the most critical part is the construction of security video surveillance network. This paper introduces how to use digital optical transceiver to establish small and medium-sized cities to set up, the town's security video surveillance network.
Why use optical transceiver to network
Although there are a variety of video transmission plan available now, but in the construction of small cities and towns of security video surveillance network, we suggest the use of optical fiber digital transmission optical transceiver to construct the platform.
At present, the radio, film and television, telecom, netcom, etc can be leased circuits, but E1 leased line, VLAN special business is more expensive, ordinary broadband circuits are mainly serves for the digital business, preached video QOS, clarity, and other issues
Security video surveillance network, generally for star structure, the higher bandwidth on demand center.
Rent broadband circuits required equipment is more, and expensive, complex system maintenance. Lease broadband circuits, the user to configure a variety of optical transceiver, optical transceiver, E1 multiplexer, L2 / L3 switch, video codec. Due to the images, has a high requirement for equipment, equipment cost is expensive, need to pay a high level of system maintenance personnel.
By contrast,
Small and medium-sized cities and towns to pull the cost of the fiber is not high, the price of the fiber decreased faster. With digital optical transceiver fiber transmits the video can reach the level distance radio level, is MPEG2 and MPEG4, JPEG is incomparable.
On optical fiber with digital optical transceiver transmission scheme of video transmission equipment is used in the optical transceiver. Digital optical transceiver without any setup, adjustment. No professional background will be installed.
Don't need to pay the rental, can use for a long time.
The basic method of network
Using single channel video/reverse data of a pair of digital optical transceiver will monitor the camera video signals transmitted to the monitoring center, the use of video distributor video signal can be divided into two road, all the way into the video matrix, all the way into the hard disk video recorder.
Connected to display video matrix, through the control of video matrix keyboard, decentralizing can schedule a video.
The choice of video optical transceiver
Now, there are many kinds of video optical transceiver on the market for engineering contractor to choose, but, do you want to rely on to consider the following factors:
The analog FM optical transceiver, or digital optical transceiver?
Whether to conform to the requirements of the environment?
Do you have a lightning protection measures?
The output optical power whether meet your requirements
Vendor's service and quality assurance
Cost performance
Matrix of interconnection
Several towns, village of matrix can be video relay connected, first video relay through multi-channel video optical transceiver connected, in the following figure, 110 command center on the screen can display A, B, C composed of video, at the same time can show A town's four most images.