Multiplex communications – Wide area network – Packet switching
Patent
1984-11-29
1986-12-30
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 66, H04Q 1104
Patent
active
046334602
ABSTRACT:
This invention relates to a time division switching system for exchanging audio signals, data and so on in a time division manner. This time division switchboard comprises a plurality of separate local exchange units capable of interfacing with various different circuits such as subscriber lines, trunk lines, service circuits and so on, one or a plurality of junctor high ways connected to a time switch of each of the local exchange units, and one or a plurality of tandem exchange units each having a time switch connected to the other ends of the junctor high ways and switching by the time switch. Each of the local exchange units selects a channel on an arbitrary junctor high way and transmits control information concerning other one of the local exchange units to which a calling is to be sent, to one of the tandem exchange units which has the selected junctor high way connected thereto. The tandem exchange unit to which the control information is sent selects a channel on a junctor high way connected to the local exchange unit to which the call is to be sent, in response to the control information sent thereto, thereby switching the calling to the desired local exchange unit. Thus, since the respective units can be loosely coupled to each other, the time division switching system of this invention has high reliability and good economy.
REFERENCES:
patent: 3760103 (1973-09-01), Condon
patent: 4025725 (1977-05-01), Euler
patent: 4074072 (1978-02-01), Christensen et al.
patent: 4173713 (1979-11-01), Giesken et al.
Amada Eiichi
Kuwahara Hiroshi
Morita Takashi
Shirasu Hirotoshi
Suzuki Taihei
Chin Wellington
Hitachi , Ltd.
Olms Douglas W.
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