What Are The Communication Networks For Videoconferencing Cameras?

What are the communication networks for videoconferencing cameras?

The communication network that carries the real-time transmission of the video information stream is a key part of the media network service. The communication network usually includes two parts: a backbone network and an access network. The backbone network refers to the public networks connected to the video front-end system, such as computer networks and ATM telecommunication networks. The access network refers to local area networks owned by video users, such as ISDN, xDSL, HFC, Ethernet, and wireless networks.

As far as the video transmission information is concerned, the current backbone communication network mainly relies on the wired communication network as the backbone bearer network, supplemented by the wireless communication network as the network extension. Wired communication network answers can be divided into telecommunications networks, computer networks and television transmission networks; wireless communication networks can be broadly divided into satellite communications, mobile communications, shortwave communications and microwave communications.

1, telecommunication network

Telecommunication networks generally refer to the public switched telephone network (PSTN), packet switched network (PSDN), digital data network (DDN), narrowband integrated service digital network (N-ISDN), and asynchronous transfer mode (ATM). The telecommunication network mainly adopts circuit switching and packet switching technologies, and has a complete service quality and network management and control mechanisms such as guarantee and authentication and billing. However, it is basically a peer-to-peer interactive communication mode. There are complicated signaling and more flexible connection establishment. Poor shortcomings, usually the transmission bandwidth is 64Kbps-622Mbps.

2, computer network

Computer network usually refers to the implementation of heterogeneous network connection using TCP/IP protocol. From the perspective of network size, it can be divided into local area network (LAN), metropolitan area network (MAN), and wide area network (WAN). It has the advantages of convenient networking and flexibility, simple signaling protocol, and can carry data, image, and voice service transmission, but lacks perfect quality assurance. Authentication and charging mechanism. For video service transmission, the network needs to provide necessary service quality guarantees, usually the transmission bandwidth is 10Mbps-10Gbps.

3, TV transmission network

TV transmission network usually refers to networks such as CATV, HFC, and satellite television networks for broadcasting video and voice. It is suitable for passively receiving broadcast information, covering a wide range of channel bandwidths. However, it is not suitable for interactive communication and lacks perfect authentication and charging mechanisms. Usually, the transmission bandwidth is 2-8 Mbps.