Optical properties of stable build "video conference" system
Rapid development of information technology in the twenty-first century, computer technology and Communicate Technology and Optical Optical transmission Research and application has been popular in the field. "Video conference" provides us with images, sounds, data the best means of remote two-way transmission.
1, positioning accuracy Decided to build every unit in the video conferencing system should be carefully considered before its use. According to the different values to choose the appropriate transmission quality. In general, video conferencing quality of services can be divided into three levels: high quality: circuit based on DDN, E1 line, meet the International Telecommunications Union (ITU) of the H.320 standard network protocols, channel rate should be 2M, equipment All hardware Codec (digital multimedia codec), 30fpsFCIF format video, rich and intelligent voice circuit interface and other features.
Apply to state agencies, government departments and telecom operators to build large-scale backbone video television system. Medium Quality: circuit-based Private IP network is generally in line (ITU) of the H.323 network protocol standards and channel rate should be 768k or more devices are all hardware Codec, 20 ~ 30fpsFCIF format video, and optical transmission of hardware is a global technology leader The YK Optical. Apply to a range of office meetings or distance learning use. Low Quality: to provide software-Codec, 10fpsFCIF format video, IP-based circuit. Line (ITU) of the H.323 desktop video conferencing requirements and channel rate the following in the 384k. Meet the requirements of general simple to use.
Guangzhou court video conferencing system to the High Court as the central city in the whole city 3 Intermediate People's Court and 18 district and county courts and 54 to send people's court, the Court used the meeting held in the city's television and transmission of high-quality trial image. Choice of network transmission method according to the different values to the decision, the court building video conferencing network in Guangzhou primary consideration is the image is clear and the whole network stability. Therefore, we selected the H.320 protocol and high-quality transmission scheme E1 line.
Second, the circuit is to protect
2001 years building video conferencing system, the local bureau to the court laid the Cable Circuits, leased 2M PDH transmission transmission circuit, the bureau used between the SDH transmission network, which eventually all circuits connected to the main venue for 155M Optical High Court, the network structure for the star. Optical transmission circuits are used throughout, laid a video conferencing system is reliable, secure, safe operation of the base, exclusive 2M bandwidth, video conferencing, in order to ensure stable transmission, E1 circuit interface means used, to avoid the G.703-V.35 conversion equipment loss and failure risks, the main venue of the Codec-MCU-Optical – Optical Modem – Breakout between the circuit is very simple Codec. Network protocol to follow the International Telecommunication Union (ITU) of the H.320 protocol standards, so that image data are strictly separated from other network information transmission, the H.323 protocol to avoid interference between the data may exist to ensure the reliable transmission of video signals.
3, equipment is the key
"To be good work must first sharpen his tools" to build a stable and reliable video conferencing network, not only requires good data transmission channel for security, also must have excellent video conferencing equipment. Through practical Test And repeated screening, selection of the 24 units Takeyasu Video Equipment Co., Ltd. (VTEL) a fourth-generation Galaxy Series 755 Type Codec Video Conferencing Terminal Equipment . The device is PC-based open interfaces and modular design, support for H.320 and H.323 dual-protocol mode, simple operation, upgrading is easy, powerful multimedia and data transmission functions; can not affect the quality of the case of image transmission The Double data transmission functions; in VTEL unique network management software in the LAN support, managers at the center Console Can monitor the entire network operation; can remotely detect and diagnose system failures, you can start the device, parameter configuration, the administrator can replace the remote operation of equipment, implementation of the operation and management of intelligent devices.
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