Overview: A highway usually sets up one section monitoring sub center to monitor and manage a certain section. The images of each toll station are selected and uploaded according to the requirements of the section monitoring sub center. The section center uniformly monitors and manages the images uploaded by each toll station in the section.

Based on user needs and actual situations, it is recommended to use the following methods for audio, video, and control signal transmission from toll stations to road monitoring centers according to different situations;

1. Product Description:

Adopting a fully digital point-to-point video optical transceiver, a cascaded matrix system is used between the station level toll station and the monitoring sub center in a point-to-point manner to selectively transmit several images from each station level toll station to the monitoring sub center. Both the monitoring sub center and the station level toll station can control the front-end monitoring points, with the monitoring sub center having priority. This two-level matrix cascade system has the functions of signal upload and multi-level management. The higher-level station can control the corresponding functions of the local and lower level matrices, making monitoring and management extremely simple. It is recommended to use the Tian Di Weiye 87 series cascade control matrix, which is characterized by the use of ferroelectric storage and CAN bus technology, greatly improving the speed of control switching management. At the same time, the stability and ultra long transmission distance of CAN bus * maximize the suppression of various interference factors.

2. Implementation process of video optical transceiver:

Using a single fiber optic cable to upload video images from all toll stations saves a lot of fiber optic resources and engineering work. However, due to the use of compression technology or uncompressed coarse wavelength division multiplexing technology, the transmission effect will be greatly affected, and the total project cost will be greatly increased. The application of this method in engineering is becoming increasingly rare.

This is a compressed transmission method that requires high network environment requirements and has poorer transmission performance than point-to-point matrix cascading transmission, but it eliminates wiring and other engineering costs.

3. Comparison between video cable and fiber optic cable:

Fiber optic cables have many advantages over copper wires and coaxial cables. Due to its good tensile strength, small mass, and compact size, optical cables can maximize the utilization of distribution pipelines and minimize installation issues as much as possible. That's why telephone companies like to use fiber optic cables. Many existing cable conduits are already filled and it is impossible to add new cables. Replacing all cables with optical fibers can save a lot of space, and copper material manufacturers add a lot of extra cost when manufacturing copper wire. Fiber optic cables are much lighter than copper wires, with 1000 twisted pair cables of 1km length weighing up to 8000kg, while two fibers of 1km length with larger capacity weigh only 100kg, greatly reducing the need for expensive mechanical support systems that must be maintained. For new lines, fiber optic cables outperform copper cables due to their low installation costs.

Because optical fibers are not charged, they are an ideal method for use in hazardous environments such as flammable and explosive environments. In such environments, if copper wire is used, sparks from the gap when the wire breaks will cause an explosion accident. Moreover, if the fiber optic cable is damaged, there is no risk of electric shock to humans. In addition, unlike traditional copper and aluminum wires used for structural wiring installation, fiberglass is a corrosion-resistant material.

Especially in terms of signal transmission, optical cables have advantages that traditional cables do not have. Because optical fibers are not affected by electromagnetic interference, they provide clearer signals than copper wires. Fiber optics will not be affected by engine rotation or power failure. Moreover, the signal attenuation in optical fibers is relatively small, requiring only one repeater every 30km on long lines, while copper wires require one repeater every 5km, which allows optical fibers to save a lot of money. In addition, the fiber optic cable can be used continuously for a length of 550 meters (1800 feet).

Fiber optic technology provides unparalleled flexibility and scalability to meet future needs. Fiber optic can provide much higher bandwidth than copper wire, which makes it suitable for advanced networks. Data transmission rates exceeding 10Gbps have been achieved, making fiber optic an ideal foundational cable technology for tomorrow's broadband networks.

Finally, optical fibers do not leak light and are difficult to splice, making fiber optic networks difficult to monitor and have a high level of security.

The reason why optical fibers are superior to copper wires is due to their different internal physical structures. When electrons move along a copper wire, they interact with each other and are also influenced by electrons outside the copper wire. However, photons in optical fibers not only do not affect each other (without charging or discharging), but are also not affected by photons outside the fiber.