US Patent No: 5,412,498

Number of patents in Portfolio can not be more than 2000

Multi-RC time constant receiver

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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A protocol for fiber-optic communication systems, or other communication systems based on transmission of unipolar pulses having wide dynamic range provides for information to be transmitted in packets having a predictable time slot for each transmitter. The receiver for such protocol has a first relatively long RC time constant mode conditioned for reception of data packets whose time of arrival is well predictable and a second relatively short RC time constant mode conditioned for reception of asynchronous randomly received packets. In the relatively long RC time constant mode, each packet includes a preamble having a first clamp interval in which no pulse is transmitted, and a second clamp interval in which a continual pulse is transmitted. A transducer on the receiver translates the packets of pulses into differential electronic signals on first and second outputs. First and second coupling capacitors, receive respective outputs of the transducer and AC couples the signals to respective second terminals of the capacitors. First and second switches connect the second terminals of the respective coupling capacitors to ground during the first and second clamping intervals, respectively, of the preamble. By clamping the outputs of the transducer to ground during the first and second clamping intervals, a DC level for each incoming packet is instantly established independent of the magnitude of the incoming packet. In the asynchronous mode, relatively low impedance discharge paths are established to reduce the time constant of the receiver. An output circuit, connected to the second terminal of each of the first and second coupling capacitors, supplies sequences of digital output signals in response to the differential signals.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
ERICSSON RAYNET, A DE GENERAL PARTNERSHIPMENLO PARK, CA29
RAYNET CORPORATIONMENLO PARK, CA41

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Arstein, David M Scotts Valley, CA 5 106
Geller, William L Foster City, CA 17 217
Gles, Thomas E Union, CA 1 32
Thomas, Mark S Williamson, NY 40 271

Cited Art Landscape

Patent Info (Count) # Cites Year
 
Bell Telephone Laboratories, Incorporated (2)
4,241,236 Noise range indicating system 15 1978
4,236,256 Asynchronous data receiver 16 1979
 
HEWLETT-PACKARD COMPANY (1)
4,908,530 Non-linear squelch circuit for IEEE-802. 3 protocol 10 1987
 
ITT Electro Optical Products, A Division of ITT Corporation (1)
4,694,504 Synchronous, asynchronous, and data rate transparent fiber optic communications link 20 1985
 
Optelecom, Inc. (1)
4,679,252 Fiber optic receiver having a method and an apparatus for data clock extraction 10 1984
 
Raynet Corporation (1)
5,208,693 Transmission protocol for clamping receiver 10 1991
 
Sperry Corporation (1)
4,241,455 Data receiving and processing circuit 45 1977

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
AURORA NETWORKS, INC. (27)
6,973,271 System and method for communicating optical signals between a data service provider and subscribers 16 2001
7,130,541 System and method for communicating optical signals upstream and downstream between a data service provider and subscriber 2 2001
7,197,244 Method and system for processing downstream packets of an optical network 21 2001
7,085,281 Method and system for processing upstream packets of an optical network 33 2001
7,184,664 Method and system for providing a return path for signals generated by legacy terminals in an optical network 5 2002
7,218,855 System and method for communicating optical signals to multiple subscribers having various bandwidth demands connected to the same optical waveguide 17 2002
6,654,565 System and method for increasing upstream communication efficiency in an optical network 30 2002
7,190,901 Method and system for providing a return path for signals generated by legacy terminals in an optical network 33 2003
7,146,104 Method and system for providing a return data path for legacy terminals by using existing electrical waveguides of a structure 7 2003
7,039,329 System and method for increasing upstream communication efficiency in an optical network 3 2003
7,058,260 Reflection suppression for an optical fiber 3 2003
7,333,726 Method and system for supporting multiple service providers within a single optical network 2 2003
7,529,485 Method and system for supporting multiple services with a subscriber optical interface located outside a subscriber's premises 0 2003
7,269,350 System and method for communicating optical signals between a data service provider and subscribers 0 2004
7,355,848 System and method for removing heat from a subscriber optical interface 14 2005
7,340,180 Countermeasures for idle pattern SRS interference in ethernet optical network systems 2 2005
7,583,897 Optical network system and method for supporting upstream signals propagated according to a cable modem protocol 3 2006
7,389,031 Reflection suppression for an optical fiber 0 2006
7,606,492 System and method for communicating optical signals upstream and downstream between a data service provider and subscribers 1 2006
7,593,639 Method and system for providing a return path for signals generated by legacy terminals in an optical network 1 2007
7,454,141 Method and system for providing a return path for signals generated by legacy terminals in an optical network 2 2007
7,623,786 System and method for communicating optical signals to multiple subscribers having various bandwidth demands connected to the same optical waveguide 0 2007
7,599,622 System and method for communicating optical signals between a data service provider and subscribers 0 2007
7,616,901 Countermeasures for idle pattern SRS interference in ethernet optical network systems 0 2007
7,986,880 Method and system for providing a return path for signals generated by legacy terminals in an optical network 1 2008
7,953,325 System and method for communicating optical signals between a data service provider and subscribers 0 2009
8,682,162 Method and system for providing a return path for signals generated by legacy terminals in an optical network 0 2011
 
BROADCOM CORPORATION (1)
6,686,799 Burst mode limiter-amplifier 3 2002
 
Enablence Technologies Inc. (1)
7,877,014 Method and system for providing a return path for signals generated by legacy video service terminals in an optical network 2 2004
 
ERICSSON INC. (1)
6,038,226 Combined signalling and PCM cross-connect and packet engine 26 1997
 
INTUNE NETWORKS LIMITED (1)
8,494,365 Random gap insertion in an optical ring network 0 2011
 
NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY (1)
8,093,518 Switching element relying on nanogap electrodes 1 2006