1. Video integration into the network
Now the video conferencing system is gradually shifting from the high-end dedicated market to the low-end market, and the application scope is extended to the fields of internal communication, external collaboration, business negotiation, remote training, and paperless office.
The early video conference system was mainly applied to the government and large-scale industry users. Now the video conference system is gradually shifting from the high-end dedicated market to the low-end market. Its use is far beyond the scope of traditional administrative conferences and office conferences. Internal communication, external collaboration, business negotiation, remote training, paperless office and other fields. In particular, after enterprises and government agencies recognize the role and value-added functions of video conferencing, video conferencing is gradually integrated into the corporate network and e-government network, and there is a strong demand for conference room meetings and desktop meetings.
2. Different strategies for different networks
At present, the technology mature and dominant in the market is the video conference system based on H.320 or H.323 standard. The H.320 system is a dedicated solution suitable for circuit-switched networks, while the H.323 system is an open solution suitable for packet-switched networks. The IP video conference system based on H.323 is gradually recognized by enterprise users. Considering compatibility and interoperability, video products of mainstream manufacturers all support H.320 and H.323 dual-mode operation to protect user investment. With the improvement of computer computing power and the continuous increase of network bandwidth, the software video conference system based on MPEG4 video compression standard is becoming more and more mature and is favored by small and medium-sized enterprises.
Video conferencing solutions are very professional, and user needs, venue points, and network environment are all factors to be considered. Video conferences have very high real-time requirements. When choosing a video conference solution for an enterprise, you should pay attention to the network environment and deploy a corresponding video conference bearer network. For enterprise users, the stability and high quality of video conferencing are crucial. Due to network conditions, video conferencing systems were mainly used in private networks in the past few years. In the field of enterprise professional video conferencing, the H.320 system occupies a dominant position. In recent years, with the increasing improvement and development of broadband networks, the stability and reliability of IP networks have been continuously improved, and the application of H.323 video conference systems based on IP networks has developed rapidly. However, the QoS problem based on the IP network has not been fundamentally resolved. Problems such as network jitter, chaotic packet order, and network congestion can lead to instability in the conference system. When the problem is serious, the conference cannot even proceed normally. At present, the bandwidth requirement of a mature conference room-level video conference system is 384K. In practical applications, it is generally necessary to deploy dedicated line networks and IP private networks, and users with low requirements may consider using the Internet.
Multinational companies and enterprises with overseas branches need to build a multinational video conference system, which is usually a conference room-level conference system. Due to the long distance, the public network conditions across are more complicated. To ensure reliability, a dedicated line network should be established.
Generally, a dedicated network based on circuit switching is used, and video equipment based on the H.320 protocol is used. Only in this way can stability, reliability, and high image quality be ensured. It can be said that there is currently only a dedicated network based on circuit switching for a video transmission network that can guarantee quality worldwide. Usually ISDN, E1 dedicated line or satellite line is used for international lines, and DDN, frame relay, ATM, etc. can be used to connect domestic conference sites, and a star or tree network structure is used. The H.320 protocol supports this circuit-switched network. Due to the advantages of connection-oriented, small transmission delay, and low error rate, the quality of the video conference is easily guaranteed. This kind of scheme is expensive and belongs to a dedicated system. It is suitable for enterprises with few meeting room points and large meeting business volume.
Another solution is to combine a dedicated line network with an IP network and adopt a video conference system based on H.320 / H3.23 dual mode. The international line uses ISDN or E1 dedicated line, using H.320 video equipment; the domestic part uses DDN for remote connection, the local area network uses Ethernet, and uses H.323 video equipment to deploy a gateway between H.320 and H.323 equipment. This type of solution is more flexible and convenient for expanding some domestic venues. It is suitable for multinational enterprises with more domestic venues, fewer foreign venues, and large conference business volume.
Another solution is to use a satellite communication network. Satellite networks have unmatched performance advantages over terrestrial networks in mid- and long-distance video conferencing. They have wide coverage, high transmission rates, good security, and cost-effectiveness. They are also flexible and convenient for venue construction and relocation. China Satellite Communication's "Satellite Broadband Video Conference System" supports the comprehensive transmission and broadcasting of multi-channel conference video files and data.
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