Assignee: Symmetricom, Inc.

Location: San Jose, CA
No. of patents: 29

Number	Title	Issue Date
8107502	Method and apparatus for monitoring packet networks A packet probe for a packet network accurately generates and monitors packets within the network. The packet probe supports packet generation and packet transmission. When a packet is ready for transmission, a hardware-based time stamp unit affixes a time stamp to t...	01/31/2012
8064484	Enhanced clock control in packet networks One embodiment of the present invention sets forth a method for autonomously validating the time and frequency data obtained from multiple sources, and generating a suitable estimate of the frequency difference between the client clock and the source. The method inc...	11/22/2011
7894489	Adaptive play-out buffers and adaptive clock operation in packet networks Methods and apparatus for a play-out buffer that may adjust offsets between clocks of two ends of a network link with an adaptive play-out buffer and adaptive clock control. The play-out buffer is a circular jitter buffer that permits the absorption of a frequency o...	02/22/2011
7876788	Network time transfer The invention comprises a method and apparatus for reducing uncertainty in timing on the network. The uncertainty in receive buffers is removed by time stamping the arriving packets before sending the packets to the receive buffer. The uncertainty in the transmissio...	01/25/2011
7660332	Supporting synchronization status messages on building integrated timing supply synchronization supply unit remote shelves Systems and methods are described for supporting synchronization status messages (SSM) on building integrated timing system synchronization supply unit (BITS-SSU) remote shelves. A method includes providing a composite clock reference to a remote synchronization sup...	02/09/2010
7636022	Adaptive play-out buffers and clock operation in packet networks Methods and apparatus are described for a play-out buffer. A method includes writing a data packet into a jitter buffer at a write address specified by a write address generator; incrementing the write address generator; generating the difference between the write a...	12/22/2009
7633870	Network forwarding device and method that forward timing packets through the device with a constant delay The variable latency associated with standard network forwarding devices is eliminated by forwarding timing packets through a network forwarding device with a constant delay. The network forwarding device of the invention time stamps timing packets that are received...	12/15/2009
7609769	Image complexity computation in packet based video broadcast systems A method to determine real time image complexity in video streaming, IPTV and broadcast applications using a statistical model representing channel bandwidth variation and image complexity that considers scene content changes. Available channel bandwidth is distribu...	10/27/2009
7535931	Two-way timing protocol A two-way time transfer protocol includes: sending a signal from a first node including a first clock and a first time interval counter coupled to the first clock over a transport physical layer coupled to the first node to a second node coupled to the transport phy...	05/19/2009
7535900	Multiple transmission bandwidth streams with defferentiated quality of service Methods and apparatus are described for providing multiple transmission bandwidth streams with differentiated quality of service on a inter-machine trunk. One approach includes time-division multiplexing. Another approach includes statistical multiplexing. Another a...	05/19/2009
7382845	Distribution of synchronization in an ethernet local area network environment Systems and methods are described for distribution of synchronization in a packet switched local area network environment. A method for extracting network synchronization timing from a data transmission burst includes: recovering a clock during the data transmission...	06/03/2008
7366286	Modified asymmetric digital subscriber line for use with long loops Systems and methods are described for modified asymmetric digital subscriber line for use with long loops. A method includes modifying a digital signal processor including reallocating a portion of an original guard band to a modified downstream band and reallocatin...	04/29/2008
7349401	Bonded G.shdsl links for ATM backhaul applications Systems and methods are described for deploying bonded G.shdsl links for ATM backhaul applications. A method includes transporting digital data including: coupling a first end of a plurality of unbundled network elements to a first modem; coupling a second end of th...	03/25/2008
7310310	Multi-link SAR for bonding ATM cell-streams Systems and methods are described for bonding asynchronous transfer mode permanent virtual circuits using a multi-link segmentation and reassembly sublayer. A method includes: transforming a plurality of streams of asynchronous transfer mode cells into a stream of b...	12/18/2007
7161953	Bonding multiple G.shdsl links Systems and methods are described for bonding multiple G.shdsl links. A method includes transporting digital data including: coupling a first end of a plurality of unbundled network elements to a first modem; coupling a second end of the plurality of unbundled netwo...	01/09/2007
7158523	Multi-link segmentation and reassembly sublayer for bonding asynchronous transfer mode permanent virtual circuits Systems and methods are described for bonding asynchronous transfer mode permanent virtual circuits using a multi-link segmentation and reassembly sublayer. A method includes: transforming a stream of asynchronous transfer mode cells into a stream of bonded asynchro...	01/02/2007
7149740	Using a common link field key Systems and methods are provided for interfacing between an element management system and a network management system in a network. A method includes associating a plurality of physical elements of a network with at least one element management system; providing a n...	12/12/2006
7142619	Long subscriber loops using automatic gain control mid-span extender unit Systems and methods are described for long subscriber loops using automatic gain control. A method includes extending a digital subscriber loop including: producing an output signal in a first direction from a variable gain amplifier at a mid-span extender unit resp...	11/28/2006
7130332	Pilot tracking for synchronization using correlation between digital signal and locally generated version of PN signal A method of tracking a pilot channel to discipline an oscillator includes: downconverting the RF signal to a low frequency that is of the order of, but greater than the chip rate; converting the signal into digital format; computing complex correlations between the ...	10/31/2006
7039103	Asymmetric digital subscriber line methods suitable for long subscriber loops Systems and methods are described for asymmetric digital subscriber loops. A method includes utilizing a circuit having a first end and a second end, the circuit having a first amplification interface connecting the first end to the second end in a first direction, ...	05/02/2006
7006610	Download booster for ADSL transmission Systems and methods are described for a download booster for ADSL transmission. A method includes extending a digital subscriber loop including: coupling a telephone company central office to a customer premises via the digital subscriber loop; filtering a downstrea...	02/28/2006
6985499	Precise network time transfer The invention comprises a method and apparatus for reducing uncertainty in timing on the network. The uncertainty in receive buffers is removed by time stamping the arriving packets before sending the packets to the receive buffer. The uncertainty in the transmissio...	01/10/2006
6943609	Stratum clock state machine multiplexing switching A method includes receiving a pair of input clock signals; utilizing a stratum clock state machine to control a multiplexer; utilizing the multiplexer to switch an input of a main clock between each of the pair of input clock signals; inducing a phase build-out acti...	09/13/2005
6876242	Synchronization module Systems and methods are described for a core sync module. A method includes receiving a pair of input clock signals; utilizing a stratum clock state machine to control a multiplexer; utilizing the multiplexer to switch an input of a main clock between each of the pa...	04/05/2005
6842426	Fault detection for subscriber loop repeaters Systems and methods are described for fault detection for subscriber loop repeaters. A method includes monitoring an upstream signal on a digital subscriber loop for a fault detection signal that is added to said upstream signal at a repeater; and determining if a f...	01/11/2005
6842498	Global positioning system interference detection Systems and methods are described for a GPS receiver capable of functioning in the presence of interference. A method includes detecting an interfering signal including: tuning a band pass filter over a frequency range; and at each of a plurality of incremental freq...	01/11/2005
6829292	Increasing gain with isolating upstream and downstream filters and amplifiers Systems and methods are described for digital subscriber loop repeaters. A method of transforming a digital subscriber loop signals includes increasing a gain with a digital subscriber loop repeater including: isolating an upstream signal band by passing an upstream...	12/07/2004
6765424	Stratum clock state machine multiplexer switching Methods include receiving a pair of input clock signals; utilizing a stratum clock state machine to control a multiplexer; utilizing the multiplexer to switch an input of a main clock between each of the pair of input clock signals; inducing a phase build-out activi...	07/20/2004
6707329	Clock recovery or detection of rapid phase transients Systems and method are described for clock recovery or detection of rapid phase transients. An apparatus includes: a numerically controlled oscillator; a phase detector coupled to the numerically controlled oscillator; and a multiplexer coupled to the phase detector...	03/16/2004

PatentStorm

Did You Know...

PatentStorm News

Assignee: Symmetricom, Inc.