Video conferencing network

Network environment there are two: one is based on circuit-switched networks, such as ISDN, DDN, PSTN etc. Another is based on a packet-switched network, such as IP, frame relay and ATM. Using the ISDN line access. For most individual users and small business users, access using ISDN lines are more economical and practical option. ISDN (IntegratedServiceDigitalNetwork, namely, integrated services digital network), which uses the public telephone network to provide users with end-to-end digital channel connection, used for carrying various telecommunications services, including voice and non-voice. 

Using ISDN lines, transmit videoconferencing over ISDN channels, its rate of up to 384kb/s to 2Mb/s. For users with less traffic, shorter communication time, choose the ISDN costs far lower than the rental of DDN special line or frame relay circuit costs, but also has high speed, low investment, easy networking, basic video conference system can meet the application requirements.