The 70 video conferencing end points and 40 desktop conferencing systems on the network are manufactured by a number of different suppliers including PictureTel, VCON, Tandberg, VTEL and Intel. Many of these systems require data conversion from H.320 to H.323 and from ISDN to H.323. The AAN team deployed RADVision OnLAN videoconferencing gateways and Video Interface Units (VIUs) in order to link H.320 video conferencing systems. The RADVision VIU converts the H.320 data into an IP-encapsulated H.323 stream that can run on the IP over frame network.
The AAN also uses a RADVision L2W Gateway that converts H.320 data from ISDN to encapulated H.323 so that it can also run on the network. The VIU contacts the RADVision L2W Gateway, requesting the network address of the ISDN lines. The RADVision Gateway allows the VIU to establish its network connection and enables videoconferencing users to make multipoint calls. RADVision's Gateway also provides all sites on the AAN with centralized access to ISDN lines. This has saved network developers the expense of installing ISDN lines in each location while giving them the flexibility of being able to move videoconferencing equipment from room to room without ever having to move lines.
AAN, which is powered by Cisco routers, was prototyped with funds from the New York State Advanced Telecommunications project funded by Verizon, formerly Bell Atlantic. The network is also used for distance learning, training and non-critical community outreach services.
Original can be found at: RadVision