US Patent No: 5,699,391

Number of patents in Portfolio can not be more than 2000

Digital desynchronizer

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Abstract

A digital desynchronizer device (10) includes an elastic store unit (12) that receives data in an asynchronous manner and synchronously transmits the data in response to a synchronization clock generated by a clock generator (14). The clock generator (14) operates off of a reference oscillator unit (16). The clock generator (14) generates the synchronization clock signal in response to pointer adjustments identified by a pointer movement unit (18). The clock generator (14) also generates the synchronization clock signal in response to mapping jitter identified by a mapping unit (20). The pointer movement unit (18) and the mapping unit (20) identify pointer adjustments and mapping jitter, respectively, independent of each other. The clock generator (14) adjusts a width of a specific pulse bit in response to pointer adjustments identified by the pointer movement unit (18). Clock generator (14) also adjusts a width of a specific bit position, separate from the pulse bit position used for pointer adjustments, in response to mapping jitter identified by the mapping unit (20).

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
ALCATEL USA, CORP.PLANO, TX183

International Classification(s)

  • [Classification Symbol]
  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Ennghillis, Pavlina Plano, TX 3 36
Hartjes, Harry W Plano, TX 5 45
Mazzurco, Anthony Plano, TX 18 125
Shankel, III Stewart W Plano, TX 2 20
Teodorescu, Ioan V Plano, TX 9 60
Witinski, Richard C Allen, TX 3 21

Cited Art

Patent Info (Count) # Cites Year
 
AT&T BELL LABORATORIES (4)
5,119,406 Digital signal synchronization employing single elastic store 29 1990
5,052,025 Synchronous digital signal to asynchronous digital signal desynchronizer 36 1990
5,268,936 Synchronous digital signal to asynchronous digital signal desynchronizer 38 1993
5,337,334 Synchronous digital signal to asynchronous digital signal desynchronizer 28 1993
 
ALCATEL NETWORK SYSTEMS, INC. (2)
5,200,982 In-line piece-wise linear desynchronizer 21 1991
5,404,380 Desynchronizer for adjusting the read data rate of payload data received over a digital communication network transmitting payload data within frames 22 1992
 
ALCATEL USA, CORP. (1)
5,457,717 Apparatus and method for eliminating mapping jitter 23 1993
 
FUJITSU LIMITED (1)
5,367,545 Asynchronous signal extracting circuit 33 1992
 
LUCENT TECHNOLOGIES INC. (1)
5,343,476 Transmission system for the synchronous digital hierarchy 22 1993
 
NEC CORPORATION (1)
5,357,514 Distributed bit-by-bit destuffing circuit for byte-stuffed multiframe data 11 1992
 
NEC CORPORATION OF AMERICA (1)
5,311,511 SONET DS-N desynchronizer 27 1993
 
NORTEL NETWORKS LIMITED (1)
4,811,340 Synchronization of asynchronous data signals 67 1986

Patent Citation Ranking

Forward Cites

Patent Info (Count) # Cites Year
 
APPLIED MICRO CIRCUITS CORPORATION (3)
6,681,272 Elastic store circuit with static phase offset 5 1999
6,629,251 Elastic store circuit with vernier clock delay 3 1999
6,888,826 Pointer generator design that provides multiple outputs that can be synchronized to different clocks 2 2001
 
CIENA CORPORATION (1)
5,781,596 Desynchronising video information from synchronous network to a plesiochronous tributary with constant rate of change in the leak rate 3 1997
 
MERCURY CORPORATION (1)
5,933,432 Mapping apparatus for use in a synchronous multiplexer 2 1997
 
MICROUNITY SYSTEMS ENGINEERING, INC. (1)
6,269,136 Digital differential analyzer data synchronizer 11 1998
 
NETWORK EQUIPMENT TECHNOLOGIES, INC. (1)
7,176,928 Recovery of a serial bitstream clock at a receiver in serial-over-packet transport 2 2004
 
SONY CORPORATION (1)
5,999,580 Data signal timing correction device, filter device, and wireless portable communication terminal 10 1997