US Patent No: 5,177,736

Number of patents in Portfolio can not be more than 2000

Packet switch

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Abstract

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A packet switch comprises a switch having a plurality of input lines and a plurality of output lines for sending a packet supplied from each of the input lines to one of the output lines selected in accordance with routing information attached to each packet, a plurality of pairs of input/output lines connected to terminals or other switches, a plurality of line interface provided one for each of the input/output lines and each connected to one of the input lines and one of the output lines of the switch, and a controller connected to one of the input lines and one of the output lines of the switch. Control information is communicated between the controller and the line interfaces or the switch via a control packet through the switch. The switch may be a plurality of multi-stage connected unit switches and input lines and output lines thereof are divided into a plurality of groups. The controller is connected to an input line of one of first stage unit switches and an output line of one of final stage unit switches of one of the switch groups.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
HITACHI, LTD.TOKYO31396
HITACHI SOFTWARE ENGINEERING CO., LTD.TOKYO255

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Kihara, Yoshiaki Yokohama, JP 1 21
Kubo, Akinori Yokohama, JP 2 68
Tanabe, Shiro Hidaka, JP 32 1042

Cited Art Landscape

Patent Info (Count) # Cites Year
 
Bell Telephone Laboratories, Incorporated (4)
4,486,877 Packet switching loop-around network and facilities testing 52 1982
4,561,090 Integrated self-checking packet switch node 44 1983
4,550,397 Alternate paths in a self-routing packet switching network 71 1983
4,670,871 Reliable synchronous inter-node communication in a self-routing network 58 1985
 
BELL COMMUNICATIONS RESEARCH, INC. (1)
4,782,478 Time division circuit switch 40 1987

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
CONSTELLATION TECHNOLOGIES LLC (6)
5,519,707 Multiplexing of communications services on a virtual service path in an ATM network or the like 119 1992
5,715,396 Method for providing for automatic topology discovery in an ATM network or the like 20 1995
5,664,107 Method for providing for automatic topology discovery in an ATM network or the like 46 1995
5,586,267 Apparatus for providing for automatic topology discovery in an ATM network or the like 29 1995
5,583,991 Method for providing for automatic topology discovery in an ATM network or the like 15 1995
5,729,685 Apparatus for determining the topology of an ATM network or the like Via communication of topology information between a central manager and switches in the network over a virtual service path 42 1996
 
HITACHI, LTD. (3)
5,903,544 Packet handler 16 1997
6,850,485 Packet handler 2 2001
7,502,380 Packet handler 0 2004
 
BROADCOM CORPORATION (1)
7,609,718 Packet data service over hyper transport link(s) 2 2003
 
ENTERASYS NETWORKS, INC. (1)
5,905,723 System for achieving scalable router performance 31 1995
 
FUJITSU LIMITED (1)
5,550,821 ATM remote maintenance connection establishing system 45 1994
 
HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P. (1)
6,125,112 Non-buffered, non-blocking multistage ATM switch 28 1998
 
NEC CORPORATION (1)
6,982,975 Packet switch realizing transmission with no packet delay 8 2000
 
Newton Communications, Inc. (1)
5,313,459 Private branch exchange system and methods for operating same 11 1992
 
NIPPON TELEGRAPH AND TELEPHONE CORPORATION (1)
5,265,088 Cross-connection apparatus for B-ISDN 55 1992
 
ROCKSTAR BIDCO, LP (1)
5,694,547 System for registration of clients in an ATM network providing for communication of client registration messages to a central manager 26 1996
 
SPHERIX PORTFOLIO ACQUISITION II, INC. (1)
6,578,086 Dynamically managing the topology of a data network 69 1999
 
TELCORDIA TECHNOLOGIES, INC. (1)
5,432,783 System and method for providing egress policing for broadband virtual private networks 24 1994
 
TTI INVENTIONS A LLC (1)
5,432,785 Broadband private virtual network service and system 53 1994
 
Other [Check patent profile for assignment information] (1)
6,327,244 Packet handler 5 1998