A UNITED STATES AIR FORCE FOUR-WIRE ELECTRONIC SWITCHING DEVELOPMENT

摘要

High speed, 4-wire circuit switching equipment has been developed by the United States Air Force for universal use in tactical and fixed plant environments. Its design is based on the time-division-multiplex technique and, in association with the highway switching principle, comprises the switching and transmission 'network. The equipment is fully transistorized and. adaptable for application in local, tandem, and long haul switching modes The transmission characteristics of this equipment are such that it is directly compatible with any transmission network that consists of HF, VHF, UHF, crop scatter, micro wave, metallic circuits with or without carrier multiples or a combination thereof for processing voice, digital data, graphics, etc. with a quality better than present commercial standards. High quality transmission characteristics make possible its insertion into a communication system consisting of six tandem links of approximately 6000 miles, where the length of a typical link may be as much as 2500 miles. The equipment has been extensively factory and field tested with highly satisfactory results and presently is operational within an integrated system environment performing local and long haul tandem switching functions.