ATM switching system

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 4956839
SERIAL NO

07382419

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Abstract

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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.

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Patent Owner(s)

Patent OwnerAddress
HITACHI LTD 6 KANDA SURUGADAI 4-CHOME CHIYODA-KU TOKYO JAPAN A CORP OF JAPANNot Provided

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Gohara, Shinobu Yokohama, JP 52 1268
Mori, Makoto Yokohama, JP 87 912
Ohtsuki, Kenichi Kanagawa, JP 28 477
Sakurai, Yoshito Yokohama, JP 42 1234
Torii, Yutaka Yokohama, JP 5 383

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