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.

No abstract