Technical details

The network provided a both way full bandwidth analogue video network linking the three major metropolitan campuses of Churchlands, Mount Lawley and Joondalup by fibre optic tails drawn to the nearest telephone exchanges, and thence to Telecom's Television Operating Centre (TOC). The Bunbury Institute was similarly linked to the Bunbury Telecom exchange with the use of itinerant leased bearers to TOC. Through a switching system (CITS) in TOC and operated at Churchlands, full bandwidth interactive video could be transmitted between campuses, to provide live lectures, the down loading of already recorded material and a variety of other uses. The system provided both way signals, although the preferred mode may be one way video and two way audio, on the grounds of the increased costs related to both way transmission.

Entry to digital compression networks was achieved through a codec gateway in TOC Perth via a Rembrandt II codec. If there was a need to gain access to Picturetel systems, because, for instance, of the failure of H261 to achieve compatibility, the University could either interface a Picturetel codec within its network or negotiate with Telecom to provide a Picturetel gateway in its own system architecture.

The ECUNET architecture allowed not only the narrowcast capability between the four university campuses but also to a point to multipoint mode via the Golden West Network in Bunbury.

Currently, uplinking was to a 12 watt transponder for the WESTLINK project, or for the WA Higher Learning Networks project, and for live broadcasts via the RCTS EDTV channel, broadcasting during the four school terms.

(After Mike Grant, 1992)