Independent clocking local area network and nodes used for the same

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 5241543
SERIAL NO

07672640

Stats

ATTORNEY / AGENT: (SPONSORED)

Importance

Loading Importance Indicators... loading....

Abstract

See full text

In a local area network composed of transmission lines for interconnecting a plurality of subordinate networks including synchronous apparatuses and a plurality of nodes which connect the subordinate networks to the transmission lines, information is transferred using a fixed length frame, a clock source which generates an independent clock signal and a circuit which generates a fixed length frame with the oscillation frequency of the clock source as a reference are provided in each node so as to adopt an independent clocking system, and distribution of a common synchronizing clock required for synchronous apparatuses is made by transmission while embedding transition point information of a synchronizing clock in a specific space in the fixed length frame. Further, each node generates a fixed length transmission frame with an independent clock signal, and on the other hand, there are provided in each node, from the requirement that information quantity applied to a network is made constant, a circuit for extracting a received clock, a storage device for storing received information temporarily, and an information outgoing quantity control circuit in which information quantity which is sent out in one frame is increased when the information quantity stored in the storage device becomes more than a predetermined first reference value and information quantity which is sent out in one frame is decreased when the information quantity stored in the storage device becomes less than a predetermined second reference value.

Loading the Abstract Image... loading....

First Claim

See full text

Family

Loading Family data... loading....

Patent Owner(s)

Patent OwnerAddressTotal Patents
HITACHI, LTD.TOKYO13769

International Classification(s)

  • [Classification Symbol]
  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Amada, Eiichi Tokyo, JP 40 1306
Hatekeyama, Yasuhiko Hadano, JP 1 56
Hiyama, Kunio Fujisawa, JP 22 384
Kobayashi, Naoya Hachioji, JP 100 1977
Nakayama, Haruyuki Ebina, JP 6 115
Takiyasu, Yoshihiro Higashimurayama, JP 24 1675

Cited Art Landscape

Patent Info (Count) # Cites Year
 
SHARP KABUSHIKI KAISHA (1)
6144426 Liquid crystal projector 37 1998
 
ALCATEL USA;INTELLECTUAL PROPERTY DEPARTMENT (1)
* 4858232 Distributed switching system 84 1988
 
NEC CORPORATION (1)
* 4569041 Integrated circuit/packet switching system 81 1984
 
NORTEL NETWORKS LIMITED (2)
* 4811340 Synchronization of asynchronous data signals 69 1986
* 4791652 Synchronization of asynchronous data signals 47 1987
* Cited By Examiner

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
MOTOROLA MOBILITY LLC (1)
* 5534937 Minimum-delay jitter smoothing device and method for packet video communications 94 1994
 
Telsima Inc. (4)
6920113 Transport of iscochronous and bursty data on a sonet ring 19 2000
* 7085293 Scaleable transport of TDM channels in a synchronous frame 5 2001
* 2002/0009,100 Scaleable transport of TDM channels in a synchronous frame 6 2001
* 2002/0059,408 Dynamic traffic management on a shared medium 48 2001
 
GATESAIR, INC. (2)
* 7301960 Apparatus for and method of control and communication of multiple stations in a TDM network 0 2000
* 2002/0075,890 Apparatus for and method of control and communication of multiple stations in a TDM network 1 2000
 
MEDIATEK INC. (2)
* 8879585 Frame timing controller and frame timing control method for triggering at least receiver in mobile station to start receiving transmitted information of base station by referring to at least frame pointer 0 2010
* 2011/0280,354 FRAME TIMING CONTROLLER AND FRAME TIMING CONTROL METHOD FOR TRIGGERING AT LEAST RECEIVER IN MOBILE STATION TO START RECEIVING TRANSMITTED INFORMATION OF BASE STATION BY REFERRING TO AT LEAST FRAME POINTER 1 2010
 
EXCEL SWITCHING CORPORATION (1)
6278718 Distributed network synchronization system 35 1996
 
ORACLE AMERICA, INC. (1)
6766464 Method and apparatus for deskewing multiple incoming signals 11 2001
 
NEC CORPORATION (2)
* 5357515 Non-interruption transmission line switching system in a duplex transmission network 1 1993
* 5481547 SDH radio communication system and transmitter/receiver equipment therefor 6 1993
 
WSOU INVESTMENTS, LLC (1)
* 6163549 Synchronizing a central timing unit to an external link via a switching network 6 1997
 
NXP B.V. (1)
* 2008/0198,877 Electronic Device, Method for Frame Synchronization, and Mobile Device 1 2006
 
MACOM CONNECTIVITY SOLUTIONS, LLC (1)
* 6888826 Pointer generator design that provides multiple outputs that can be synchronized to different clocks 4 2001
 
KONINKLIJKE PHILIPS ELECTRONICS N.V. (1)
* 2005/0141,611 Transmission of stuffing information for transmission of layered video streams 0 2004
 
KABUSHIKI KAISHA TOSHIBA (1)
* 6934296 Packet transfer device and packet transfer method adaptive to a large number of input ports 17 2002
 
TELLABS OPERATIONS, INC. (7)
6526139 Consolidated noise injection in a voice processing system 41 2000
6526140 Consolidated voice activity detection and noise estimation 63 2000
6522746 Synchronization of voice boundaries and their use by echo cancellers in a voice processing system 121 2000
7003097 Synchronization of echo cancellers in a voice processing system 8 2002
7039181 Consolidated voice activity detection and noise estimation 10 2002
* 2003/0091,182 Consolidated voice activity detection and noise estimation 15 2002
7236586 Synchronization of echo cancellers in a voice processing system 5 2005
 
ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE (1)
8311175 TDD communication apparatus and operation method thereof 0 2008
 
AVAGO TECHNOLOGIES GENERAL IP (SINGAPORE) PTE. LTD. (2)
* 6091705 Method and apparatus for a fault tolerant, software transparent and high data integrity extension to a backplane bus or interconnect 28 1996
6581126 Method, system and apparatus for a computer subsystem interconnection using a chain of bus repeaters 8 1999
 
INTERNATIONAL BUSINESS MACHINES CORPORATION (3)
* 5691660 Clock synchronization scheme for fractional multiplication systems 11 1995
* 5687356 Hub and interface for isochronous token ring 22 1995
6615281 Multi-node synchronization using global timing source and interrupts following anticipatory wait state 18 2000
 
SYNTEK CAPITAL GMBH (1)
* 2010/0150,146 DEVICE, SYSTEM AND METHOD OF COMMUNICATING BETWEEN CIRCUIT SWITCH INTERFACES OVER AN ANALOG MODULATION COMMUNICATION NETWORK 0 2010
 
EXTREME NETWORKS, INC. (1)
* 6122281 Method and apparatus for transmitting LAN data over a synchronous wide area network 77 1997
 
SIEMENS AKTIENGESELLSCHAFT (1)
* 5579513 Method for monitoring the synchronization of clocks in computer networks 44 1995
 
TELEFONAKTIEBOLAGET L M ERICSSON (PUBL) (2)
* 5517499 Method and an arrangement for synchronizing two or more communication networks of the time multiplex type 8 1994
* 5724360 Composite clock signal 4 1994
 
MICROSEMI FREQUENCY AND TIME CORPORATION (2)
* 5828670 Distribution of synchronization in a synchronous optical environment 31 1995
* 5638379 Encoding system for distribution of synchronization 23 1995
 
ADTRAN, INC. (1)
* 5680422 Method and apparatus for reducing waiting time jitter in pulse stuffing synchronized digital communications 11 1995
 
FUJITSU LIMITED (6)
* 5778188 System for controlling delays in a ring by assembling subframes with a variable-delay by a master node, and with a fixed-delay by other nodes 9 1995
* 5768282 Node provided with facility for checking establishment of synchronization 4 1996
* 6385213 Frame synchronous pattern processing apparatus and frame synchronous pattern detection apparatus and method for detecting frame synchronous pattern 13 1997
* 5991477 Optical transmission system, optical multiplexing transmission system, and related peripheral techniques 45 1998
* 6041066 Method of synchronization status message processing in transmission apparatus 28 1998
7151783 Frame synchronous pattern processing apparatus and frame synchronous pattern detection apparatus and method for detecting frame synchronous pattern 1 2001
 
TOYO MICROSYSTEMS CORPORATION OHSAKI NEW CITY (1)
* 6987776 Multiplex communication method, the device and the system thereof 0 2000
 
SARTRE SATIRE LLC (2)
* 7684442 Method and circuit for processing data in communication networks 3 2006
* 2007/0076,624 Method and circuit for processing data in communication networks 0 2006
 
The Force, Inc. (1)
* 5459607 Synchronous optical digital transmission system and method 23 1993
 
Alcatel Network Systems, Inc. (1)
* 5602880 Method and system for minimizing resynchronization delays in digital microwave radio systems 2 1993
 
CORIANT OY (1)
8081664 Method and arrangement for regenerating a timing signal in digital data communication 0 2006
 
RPX CLEARINGHOUSE LLC (1)
6584118 Payload mapping in synchronous networks 36 1998
 
NATIONAL SEMICONDUCTOR CORPORATION (3)
* 5619686 Source synchronized data transmission circuit 2 1993
* 5668811 Method of maintaining frame synchronization in a communication network 39 1995
* 5754835 Source synchronized data transmission circuit 2 1997
 
INTEL CORPORATION (1)
* 5903774 External network network interface device without interim storage connected to high-speed serial bus with low latency and high transmission rate 9 1996
 
TEXAS INSTRUMENTS INCORPORATED (1)
* 5517638 Dynamic clock switching circuitry and method 17 1993
 
ALCATEL (2)
6236660 Method for transmitting data packets and network element for carrying out the method 34 1998
7248588 Method for transmitting data packets and network element for carrying out the method 2 2001
 
PLX TECHNOLOGY, INC. (3)
6400682 Method and apparatus for a fault tolerant, software transparent and high data integrity extension to a backplane bus or interconnect 21 1999
6212161 Method and apparatus for a fault tolerant software transparent and high data integrity extension to a backplane bus or interconnect 10 1999
* 6885670 Method and apparatus for fault tolerant, software transparent and high data integrity extension to a backplane or bus interconnect 8 1999
 
UNISYS CORPORATION (3)
* 5537418 Data transmit resynchronization at a node 1 1993
* 5652758 Data resynchronization 2 1996
* 6081538 Resynchronization of data 1 1997
* Cited By Examiner