Five access methods of Video Conferencing Technology

According to the investigation and analysis results, the amount of visual information obtained by humans accounts for about 70% of the total amount of information, and the application scope of video technology is constantly expanding. For video conferencing systems that rely on network operations, the network environment plays a decisive role in meeting results. Video conferencing supports the following network access methods:

IP Network-Based System

For small and medium-sized users and individual users with sufficient network bandwidth, IP-based networks are the best choice. The IP network is what we usually call a broadband network. This network access method is simple, cost-effective, and widely used. The network is based on a variety of transmission media and uses the TCP/IP protocol as the communication protocol. Through the Router Network, IP packet routing and exchange transmission are realized.

Generally, UDP/IP, RTP, RTCP, And RSVP protocols are used to better solve the service quality of real-time communication. Currently, video conferencing systems applied on Broadband IP networks such as ADSL, FTTB, and LAN have achieved good results. However, the IP address based on Packet Switching follows the best delivery principle. Therefore, the video conferencing effect of this access method is inferior to that of leased lines such as ISDN and DDN. Even so, his good cost performance is favored by more and more users.

Use an ATM Network

We recommend that you use an ATM network for users with High Line conditions and high quality requirements. ATM is an asynchronous transmission mode. It combines the advantages of circuit switching and group switching. It can transmit broadband signals at any rate and transmit voice, data, images, and video services.

It is worth mentioning that the biggest feature of this technology is the QoS guarantee, which can output high-quality images for convenient networking. It does not need to link all the video conferencing terminal lines to the MCU, high reliability. If you want to achieve good video performance and the ATM network is very convenient, the access method of the ATM network is also a good choice.

Here, we need to remind users that the device cost of this solution is high and special ATM network access is required. users need to control the equipment according to their own conditions to avoid unnecessary waste of money.

Access through ISDN lines

ISDN is an integrated business digital network. It uses the public telephone network to provide end-to-end Digital Channel connections for various telecommunication services including voice and non-voice. It uses ISDN lines to transmit Conference TVs over the ISDN channel. The speed can reach kb/s to 2 Mb/s.

Because ISDN is billed Based on the B-channel used (64 KB/s), the domestic communication rate of channel 1B is equivalent to the ordinary telephone communication rate, therefore, for users with less traffic and shorter communication time, the cost of using ISDN is low, and the National ISDN network is still in the upgrading stage. The reliability and stability of the network need to be improved compared with that of the leased line.

System for renting ddnleased line

Generally, large enterprises and institutions have high requirements on video performance. In this case, you can select the access method of ddnleased line. The transmission quality of ddnleased line is high, the network latency is small, and the circuit is very reliable, it also features high network security and convenient networking.

DDN refers to the data transmission network that uses digital channels to transmit data signals. Its main function is to provide users with a digital data transmission channel with permanent and semi-permanent connections, it can be used for communication between computers or for transmitting digital fax, digital voice, digital image signals or other digital signals.

However, this method is not suitable for users with short communication time, because the digital circuit provided by DDN is semi-permanent connection and is only suitable for long-time point-to-point and multi-point communication connections, fees are charged based on the number of point-to-point instances. This way, users spend too much. Therefore, it is critical to understand their own needs when "deploying the network.

Systems connected by satellites

In regions with complex terrain and remote mountain and weak maritime signals, satellite networks have incomparable performance advantages in remote video conferencing, it has wide coverage and good security, and flexible Venue Construction and relocation. The satellite broadband video conferencing system can transmit and broadcast video, file, and data in multiple channels, making it easy to use.

In the United States, the cost of this scheme is very high. Except for the channel fee for Satellite Leasing, the construction cost of each satellite earth station is about 0.2 million yuan, which is only suitable for users who are "no bad money. At the same time, the biggest drawback of Satellite Communication is the time delay, which cannot meet the requirements of real-time video conferencing systems.

Frame Relay Mode

Frame relay is a type of Wan communication. It is mainly used to transmit data services. Frame frames are suitable for encapsulating LAN data units and sending burst services. This type of network is highly efficient, with high network throughput and low communication latency. The access rate of Frame Relay users ranges from 64 kbit/s to 2 Mbit/s, and can even reach 34 Mbit/s. Although the network cost of frame relay is very high, the video effect is better. This is the so-called high cost.