Nec Corporation

Nippon Telegraph and Telephone Public Corporation

Tatsuhiro Ono

Shin'ichi Koike

Yuji Inoue

Haruhiko Tsuchiya

In a communication system comprising a two-wire bus, bidirectional communication is carried out in a time division multiple access fashion through the two-wire bus between a plurality of terminal equipments (26) coupled to the two-wire bus and a central terminator (24) connected to one end of the two-wire bus which has the other end terminated by an active terminator (25). The central terminator transmits, to the two-wire bus, a down burst comprising a down synchronization signal and a down information signal. Each terminal equipment establishes synchronization with reference to the down synchronization signal and thereafter receives the down information signal. The active terminator sends, towards the central terminator, only an up synchronization signal produced with reference to the down synchronization signal extracted from the down burst. Each terminal equipment transmits an up information signal towards the central terminator in the form of an up burst with reference to the up synchronization signal. The up information signal may be sent back to the two-wire bus by the central terminator to carry out communication among the terminal equipments.

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Tokyo, Japan

Tatsuhiro Ono