Information processing apparatus with security checking function
It is therefore a first object of the present invention to provide an information processing apparatus that easily and securely confirms whether or not software (a program) that is to be executed by t... Read More
Inventors: Owaki, Hidetaka; Nagashima, Takeshi; Kageyama, Yukitoshi;, Assignee: Sega Enterprises, Ltd. (JP) |
Digital processing system with self-test capability
What is claimed is: 1. A digital processing system comprising: a memory means for the storing of words containing data and instructions that define operations on said data, each word contains M binary... Read More
Inventors: Amin, Pravin T.;, Assignee: |
Bistable optical device comprising a lightly doped optical fibre
We claim: 1. A bistable optical device comprising: An optical cavity bounded by input and output reflecting means located respectively at an input end and an output end thereof, said optical cavity in... Read More
Inventors: Payne, David N.; Mears, Robert J.; Poole, Simon B.; Reekie, Laurence;, Assignee: Plessey Overseas Limited (Ilford, GB) |
Stabilization apparatus and method for an SFS
It is a first object of the invention to stabilize the output wavelength of a superfluorescent fiber source. It is a second object of the invention to operate the superfluorescent source with maximum ... Read More
Inventors: Fidric, Bernard G.; Libman, David F.;, Assignee: Litton Systems Inc. (Beverly Hills, CA) |
Accordion shift register and its application in the implementation of level sensitive logic system
Conventional shift registers (S.R.) use two latches (customarily designated as L1, L2 or LA, LB) for every S.R. stage. Shift-in and shift-out operations are accomplished by parallel application of a t... Read More
Inventors: Lee, Hua-Tung;, Assignee: International Business Machines Corporation (Armonk, NY) |
Pumped CW laser with low dopant level laser medium
It is an object of the present invention to provide a laser which does not require such high power pumping to maintain continuous wave lasing in an otherwise self-terminating lasing transition. Accord... Read More
Inventors: Brierley, Michael C.;, Assignee: British Telecommunications public limited company (GB3) |
Optical cross-connect system with space and wavelength division switching stages for minimizing fault recovery procedures
It is therefore an object of the present invention to provide an optical cross-connect system capable of reconfiguring network routes in a flexible manner so that recovery procedures are minimized in ... Read More
Inventors: Shiragaki, Tatsuya;, Assignee: NEC Corporation (JP) |
Method and apparatus for determining a routing table for each node in a distributed nodal system
A method enables each node in a multi-nodal network to construct a routing table to all other nodes in the network. Each "home" or originating node performs a method which includes the steps of: trans... Read More
Inventors: Brady, James T.;, Assignee: International Business Machines Corporation (Armonk, NY) |
System and method for reconfiguring a telecommunications network to its normal state after repair of fault
To provide an automatic reconfiguration or reversion of the network to the topology it had prior to the occurrence of a fault, during the restoration process each operation performed by each of the no... Read More
Inventors: Sees, Mark Wayne; Russ, Will; Bengston, Lee Dennis; Wagner, Clinton Allen;, Assignee: MCI Communications Corporation (Washington, DC) |
Method and system of managing unidirectional failures in a distributed restoration network
OF THE PRESENT INVENTION With reference to FIG. 1, a Digital Signal 3 (DS3) path that connects node 1 to node 6 of a distributed restoration network is shown. For the sake of simplicity, no other nod... Read More
Inventors: Shah, Jasvantrai C.; Bengston, Lee;, Assignee: MCI Communications Corporation (Jackson, MS) |
Method of coordinating the respective operations of different restoration processes
OF THE INVENTION As shown in FIG. 1, telecommunications network 2 has a number of nodes, or digital cross-connect switches or intelligent devices, 2-22 each connected to adjacent nodes by respective ... Read More
Inventors: Shah, Jasvantrai C.; Bengston, Lee D.; Sees, Mark W.; Alagar, Sridhar; McGlade, Bryan; Badt, Hal;, Assignee: WorldCom, Inc. (Clinton, MS) |
Dual transmission spread processing circuit system for CDMA communication apparatus
It is an object of the present invention to provide a dual transmission spread processing circuit system for a radio base station communications apparatus which is simplified in circuit configuration ... Read More
Inventors: Atsuta, Hirosada;, Assignee: NEC Corporation (Tokyo, JP) |
Automatic on-line monitoring and optimization of optical network switching nodes
FIG. 1 is a simplified block diagram showing an optical communication system incorporating a particular embodiment of this invention. As shown, three photonic modules (101, 102, and 103), an optical ... Read More
Inventors: Fatehi, Mohammad T.; Heismann, Fred L.;, Assignee: AT&T Bell Laboratories (Murray Hill, NJ) |
Hybrid architecture for an optical switching fabric implemented with 1.times.2 switching devices
FIG. 1 shows a block diagram of a basic switching-fabric array 100 constructed according to the invention. Array 100 is an 8.times.8 (eight-input 108-by-eight-output 109) array. Array 100 is intended... Read More
Inventors: Bergland, Glenn D.; Murphy, Edmond J.; Pitio, Walter M.;, Assignee: AT&T Corp. (Murray Hill, NJ) |
Re-configurable bus back-plane system
The present invention comprises a system for coupling one or more bus structures to one or more sub-assemblies, such as circuit card assemblies or modules, in an information system via the use of an a... Read More
Inventors: Kaspari, Daniel K.;, Assignee: Rockwell International Corporation (Costa Mesa, CA) |
Multiplex transmission system and abnormality processing controlling method and apparatus used therefor
An object of the present invention is to provide a multiplex transmission system which can perform easily, quickly, safely and surely the default processing attendant on the abnormality processing con... Read More
Inventors: Iwasawa, Yoshio; Imaizumi, Nobuhiro;, Assignee: Yazaki Corporation (Tokyo, JP) |
Method and device for reducing the crest factor in digital transmission procedures
What is claimed is: 1. A method for reducing the crest factor in digital signal transmission, said method comprising the steps of: obtaining digital information to be transmitted; generating a plurali... Read More
Inventors: Bauml, Robert; Fischer, Robert; Huber, Johannes; Muller, Stefan;, Assignee: Telefonaktiebolaget LM Ericsson (Stockholm, SE) |
Unidirectional amplification for bi-directional transmission using wavelength-division multiplexing
OF A SPECIFIC EMBODIMENT One illustrative embodiment of the invention is described below as it might be implemented using dichroic (wavelength-division multiplexer, WDM) and EDFA technology. In the i... Read More
Inventors: Baker, Phillip E.;, Assignee: Williams Telecommunications Group, Inc. (Tulsa, OK) |
Ring network communication structure on an optical carrier and reconfigurable node for said structure
We claim: 1. Ring network communication structure comprising a plurality of nodes connected to each other in pairs by means of respective connections susceptible to failure, in which each connection c... Read More
Inventors: Cadeddu, Roberto; Calvani, Riccardo; Ferraris, Giuseppe; Lano, Roberto; Vezzoni, Emilio;, Assignee: CSELT- Centro Studi e Laboratori Telecomunicazioni S.p.A. (Turin, IT) |
Optical communication network and method for optically detecting a fault
In view of the foregoing problems of the conventional systems, it is therefore an object of the present invention to provide an optical communication network wherein a fault can be detected in an opti... Read More
Inventors: Shiragaki, Tatsuya; Henmi, Naoya;, Assignee: NEC Corporation (Tokyo, JP) |
Method and system for detecting optical faults within the optical domain of a fiber communication network
The present invention provides a method and system for detecting optical signal degradation or loss within the optical domain of a fiber network. Dedicated optical signals for detecting fiber faults a... Read More
Inventors: Liu, Shoa-Kai;, Assignee: MCI WorldCom, Inc. (GA) |
Method and apparatus for dynamic packet batching with a high performance network interface
Introduction One Embodiment of a High Performance Network Interface Circuit An Illustrative Packet One Embodiment of a Header Parser Dynamic Header Parsing Instructions in One Embodiment of the Inven... Read More
Inventors: Muller, Shimon; Gentry, Jr., Denton E.;, Assignee: Sun Microsystems, Inc. (Santa Clara, CA) |
Data reading and/or writing apparatus for use with an optical card
The present invention has for its object to provide a novel and useful apparatus for reading accurately a data signal out of an optical card, while an image of the card is correctly focused on a photo... Read More
Inventors: Hashimoto, Akihiko; Kitahara, Toshihiro; Hashi, Hiroshi; Rokutan, Takao;, Assignee: Olympus Optical Co., Ltd. (JP) |
Magneto-optical recording method and apparatus capable of overwriting data using a radiation beam
It is an object of the present invention to provide a method of magneto-optical recording which has no shift in the write timing and which allows exact and high speed overwriting, and an apparatus the... Read More
Inventors: Maeda, Takeshi; Ohta, Norio; Suzuki, Yoshio; Takahashi, Masahiko;, Assignee: Hitachi, Ltd. (Tokyo, JP) |
Optical focus sensor
What is claimed is: 1. A focus control apparatus for use with a disc-shaped record medium having information stored in a spiral groove formed on a flat, reflective surface thereof, the apparatus compr... Read More
Inventors: Jebens, Robert W.;, Assignee: RCA Corporation (New York, NY) |
Optical disc read/write apparatus
The invention will now be described with reference to the embodiment illustrated schematically in the various views of FIGS. 1-3. For the sake of simplicity, elements not necessary for the understand... Read More
Inventors: Damen, Theodoor C.; Duguay, Michael A.; Howard, Richard E.; Jackel, Lawrence D.; Skocpol, William J.;, Assignee: AT&T Bell Laboratories (Murray Hill, NJ) |
Device for determining a centring error of an optical disc relative to the axis of rotation of a turntable supporting the disc
What is claimed is: 1. A device for determining the centering error of an information structure on an optical record carrier relative to the axis of rotation of a turntable supporting the record carri... Read More
Inventors: Opheij, Willem G.;, Assignee: U.S. Philips Corporation (New York, NY) |
Optical information recording medium and apparatus for recording/reproducing information using the same
OF THE PREFERRED EMBODIMENT An embodiment of the optical card according to the present invention is schematically shown in FIG. 3. The optical card 1 has alternate lines of clock track 2 and tracking... Read More
Inventors: Matsuoka, Hiroshi; Aoki, Akio; Hosoya, Hideki; Matsuoka, Kazuhiko; Usui, Masayuki; Minoura, Kazuo; Kawaguchi, Fumiaki; Enari, Masahiko; Suzuki, Kenichi; Shikichi, Satoshi;, Assignee: Canon Kabushiki Kaisha (Tokyo, JP) |
Data record formatting system and reading/writing system for optical recording medium
The present invention has been made to obviate the problems as described above, and it is an object of the present invention to provide a data record formatting system for an optical recording medium ... Read More
Inventors: Izawa, Shigeru; Hasemi, Takashi;, Assignee: CSK Corporation (Tokyo, JP) |
Alignment system for exposure apparatus
The invention has an object of providing an alignment system, which permits high accuracy mark position detection while minimizing thoroughput reduction. According to the invention, first and second m... Read More
Inventors: Nishi, Kenji;, Assignee: Nikon Corporation (Tokyo, JP) |
Fault Detection 
