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During the summer of 1994 LIVE-NET moved over to a hybrid network consisting of analogue links within University College London and gateways to external digital networks.

The analogue section of the network connects the main campus of University College London (UCL) with the Whittington and Middlesex Hospitals. On the Middlesex site the link extends to the Audio Visual Centre television studio, the Multimedia research laboratory, clinical operating theatres and the X-ray and Urology departments. The analogue section of the system provides near broadcast standard video and is heavily used for teaching within the medical schools of the college, currently running at 600 hours per annum. [Figure 2]

The digital section of the network can access Integrated Services Digital Network (ISDN), SuperJANET or the Internet. ISDN can be accessed at any rate from 128kbps to 384kbps. A British Telecom VC7000 videophone can be linked into LIVE-NET via its external connections so that any site on the analogue side of the network can access its 128kbps CODEC. Higher data rates can use an Ascend inverse multiplexer connected to a GPT H261 Coder/Decoder (CODEC).

Access to other Colleges in the University is now via dial up ISDN lines rather than the dedicated analogue fibres used in LIVE-NET 1. This has been used to hold courses on Classics, Particle Physics and European History. Usage is currently about 300 hours teaching per annum.

SuperJANET can be used to connect to any of the 13 other SuperJANET ATM video sites in the UK. Transmission of video is via a 2Mbps Permanent Virtual Circuit (PVC) on the 155Mbps SuperJANET network. [Figure 3]

SuperJANET has been used for medical sessions involving Cambridge, Manchester, Newcastle and Edinburgh. During 1995 it is planned to run a series of lectures on Human Computer Interaction between UCL and Imperial College over the SuperJANET network.

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