This paper reviews two TDMA systems which have been developed at NTT (Nippon Telegraph and Telephone Public Corporation) for domestic use in Japan. The first system uses K‐Bands (30/20 GHz) and is called the TDMA‐65M system. This system constructs a variable channel capacity network between 8 major cities (regional centres). The second system uses C‐Bands (6/4 GHz) and is called the TDMA‐100M system. This system provides remote island communication links for simultaneous transmission of voice and colour television signals. These two TDMA systems were put into commercial operation in summer 1983 by using, respectively, the Communication Satellite‐2s, CS‐2a which was launched in February 1983 and CS‐2b which was launched in August 1983.

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The traffic terminal equipment (TTE) for the INTELSAT TDMA System handles the actual traffic of the network and operates under control of the reference terminal equipment (RTE) installed at the reference station. The required function and performance for the TTE are specified in detail by the INTELSAT TDMA/DSI specification, but there may be many approaches to actual equipment design. NEC's TTE has been designed based on NEC's extensive experience and field‐proven circuit techniques. In addition, the TTE design has been affected by the fact that NEC has been engaged in the development and production of the RTE for INTELSAT. NEC's TTEs have been delivered to customers since the summer in 1984, with the first test with the RTE through the satellite having been successfully performed at COMSAT's Etam station at the end of 1984. This paper describes the capabilities of the traffic terminal equipment, developed and manufactured by NEC Corporation, together with the design approach used in its fabrication.