On-board switching and processing

Article Abstract:

The NASA Lewis Research Center Space Electronics Division (SED) is working on advanced systems studies and technology development for on-board switching and processing systems. New technologies such as optical fiber are making it necessary for communications satellites to achieve great increases in satellite capacity without affecting the satellite mass or power to remain competitive. Methods for increasing the competitiveness of communication satellites include circumventing the cost drivers of terrestrial communication links, increasing satellite capacity without increasing mass or cost, increasing satellite utilization, and finding unique applications. NASA Lewis is working on narrowband and wideband channel FDMA uplinks and wideband TDMA; on-board switching and processing; fixed- and hopping-beam antennas; and very wideband time division multiplexed data on the downlink. This program is NASA's way of helping the US satellite industry to maintain a preeminent and competitive position in the communications market.

Communications satellites, On-Board Systems, NASA, technical

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Communications switching - from operators to photonics

Article Abstract:

The manual, mechanical, electronic, and photonic switching systems used by the Bell System from the early 1900s until the divestiture of the Bell System in 1984 are examined. Switching is necessary because the number of transmission links increases approximately with the square of the transmission units to be connected. Advances in electronics and computer technology demand new switching techniques to communicate electronic data through the telephone network. Laboratories and businesses are currently experimenting with photonic (fiber-optic) switching. Ultimately, economics will determine the means of telephone switching.

Telecommunications equipment, Fiber optics, Telephone systems, Communications Equipment, Telephone System

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