Multiplex communications – Wide area network – Packet switching
Patent
1989-07-20
1990-09-11
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 941, H04Q 1104
Patent
active
049568396
ABSTRACT:
In the ATM switching system, an ATM speech path is divided into a plurality of functional blocks. A routing function for distributing cells (packets) each of a fixed length to addresses outgoing lines and a logical multiplexing function are imparted to a switch, while other functions associated with a line typified by a phase synchronizing function and a flow control function are incorporated en bloc in ATM line terminating units and functions capable of being processed by hardware in common to the lines are assembled in a line common unit. The ATM line terminating unit physically terminates transmission lines and performs the processing relevant to header information of the cells each of a fixed length (ATM terminating processing) and includes a cell phase synchronizing circuit for matching the temporal positions of the cells among the lines and a flow control circuit for avoiding overload exceeding the load declared by subscriber terminal. The line common unit serves for processings of call control signals and the calls and includes a signal processing circuit and a control circuit. The switch performs cell multiplexing and switching and is constituted by a self-routing switch.
REFERENCES:
patent: 4339815 (1982-07-01), Herledan et al.
patent: 4466095 (1984-08-01), Kawano et al.
patent: 4670871 (1987-06-01), Vaidya
patent: 4782478 (1988-11-01), Day, Jr. et al.
patent: 4799215 (1989-01-01), Suzuki
patent: 4813037 (1989-03-01), Debuysscher et al.
Gohara Shinobu
Mori Makoto
Ohtsuki Kenichi
Sakurai Yoshito
Torii Yutaka
Hitachi , Ltd.
Hsu Alpus H.
Olms Douglas W.
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