Alpha Technologies Inc., Bellingham, WA, has signed an agreement with Optus Vision of Australia to provide power products to be used in the building of a communications network in Australia. Initially, the build will be concentrated in Sydney, Melbourne and Brisbane. Alpha plans to provide power supplies and related products for the video, telephony and digital services network. The 750-megahert¥digital network integrates broadcast and interactive video with telephone services over a hybrid fiber/coaxial-cable network to the home. The hybrid system allows subscribers to receive expanded cable-TV and traditional telephone service, as well as interactive video, online banking and computer interface. Optus Vision is a joint venture among Optus Communications, Continental Cablevision, Australia`s Publishing and Broadcasting Ltd., and the Seven Network Ltd.