| Patent Number |
Title Of Patent |
Date Issued |
| 6526021 |
Clear channel 1:N SONET transport system and method |
February 25, 2003 |
| A SONET format signal transport system and method providing an increased transport capacity. The transport system includes multiple low speed transport systems wherein each low speed transport system can have a pair of low speed terminals connected by N working channels and one protectio |
| 6498322 |
Portable heating tent and method for testing telecommunications equipment |
December 24, 2002 |
| A portable heating tent (10) and method are disclosed for testing telecommunications equipment (16). The portable heating tent (100 includes a tent assembly (12) that provides a housing sized to contain telecommunications equipment (16) for testing. The housing has an inlet to receiv |
| 6313442 |
Portable heating tent and method for testing telecommunications equipment |
November 6, 2001 |
| A portable heating tent (10) and method are disclosed for testing telecommunications equipment (16). The portable heating tent (100 includes a tent assembly (12) that provides a housing sized to contain telecommunications equipment (16) for testing. The housing has an inlet to receiv |
| 5924018 |
Analog microwave communication system having a microwave hop converted to a new operating freque |
July 13, 1999 |
| A converted analog radio (71) is disclosed for converting an analog microwave hop (70) to a new operating frequency. The converted analog radio (71) comprises an analog radio (72) operable to communicate microwave signals at a first frequency, a digital radio (74) operable to communi |
| 5913066 |
Electronic work environment for a data processing system |
June 15, 1999 |
| An electronic work environment for a data processing system includes documentation modules which execute on the hardware elements of the system. The documentation modules exchange data between the software elements and hardware elements of the data processing system to produce intera |
| 5907579 |
Repeater bipolar violation in-service detection system |
May 25, 1999 |
| A repeater bipolar violation in-service detection system is provided for in-service detection of a bipolar violation in a smart repeater, and includes a repeater bipolar violation in-service detection controller and a repeater bipolar violation in-service detection reporting unit. The |
| 5903372 |
Means for remote addition of video services to subscribers |
May 11, 1999 |
| The present invention details an apparatus for distribution of video and telephony services on a single twisted wire pair to each of a plurality of subscribers, comprising an optical network unit (ONU) connected by means of an optical fiber to a remote terminal, the ONU for installation |
| 5872780 |
Sonet data transfer protocol between facility interfaces and cross-connect |
February 16, 1999 |
| An internal signal within a SONET element has a transport format having overhead and payload mapped in a manner similar to the Synchronous Optical Network standard mapping, except having selected overhead bytes defined differently, including a byte used for communicating odd parity calcu |
| 5844908 |
Digital delay system and method for digital cross connect telecommunication systems |
December 1, 1998 |
| A system and method for provides a generating a plurality of clock phases from a clock signal in a telecommunications cross connect system. The digital delay circuit includes a plurality of delay elements connected in series, each delay element connected to a sampling element, the output |
| 5809032 |
Time division multiplexed synchronous state machine having state memory |
September 15, 1998 |
| A receive SONET line interface includes an elastic store which receives and stores incoming signals from a pointer tracking circuit and retrieves stored signals for providing to a pointer generating circuit wherein, for both the pointer tracking and pointer generating circuits, separate |
| 5790614 |
Synchronized clock using a non-pullable reference oscillator |
August 4, 1998 |
| Digital signal processing techniques are used to synthesize a range of output frequencies locked to a non-pullable reference oscillator, and the synthesized output frequency is used in a slave low bandwidth phase-locked loop; by increasing digital resolution in a phase accumulation regis |
| 5778447 |
System and method for fast memory access using speculative access in a bus architecture system |
July 7, 1998 |
| A data processing system including dynamic random access memory (DRAM) in a bus architecture is disclosed. A controller is included in the system which unconditionally generates the row address strobe (RAS.sub.--) and column address strobe (CAS.sub.--) signals to the DRAM responsive to t |
| 5754607 |
Method and apparatus for achieving fast phase settling in a phase locked loop |
May 19, 1998 |
| A method and an apparatus are provided to achieve fast phase settling when a reference signal for a phase locked loop changes from a first frequency to a second frequency, such as during holdover recovery in a synchronous optical network. The present method acquires the second frequency |
| 5751943 |
Electronic work environment for a data processing system |
May 12, 1998 |
| An electronic work environment for a data processing system includes documentation modules which execute on the hardware elements of the system. The documentation modules exchange data between the software elements and hardware elements of the data processing system to produce intera |
| 5740157 |
Distributed control methodology and mechanism for implementing automatic protection switching |
April 14, 1998 |
| Redundant facility payload signals (12, 14) received by redundant interface modules (16, 18) are redundantly provided (28, 30; 32, 34) to redundant downstream modules (24, 26) in an equipment (10). A non-symmetrical facility protection algorithm is resident in the B interface module (18) |
| 5726355 |
Apparatus for detecting a change in volumetric integrity of an enclosure |
March 10, 1998 |
| An apparatus for detecting a change in the volumetric integrity of the interior of an enclosure. The enclosure has an electrical interface for coupling to a circuit board and an access device for accessing said interior of said enclosure. The apparatus includes a circuit board for co |
| 5721424 |
Avalanche photodiode apparatus biased with a modulating power signal |
February 24, 1998 |
| An photodetector circuit comprising an avalanche photodiode having a signal input for receiving an input optical signal to be converted to an electrical signal. The photodetector circuit further includes biasing circuitry, coupled to the avalanche photodiode, for applying a bias volt |
| 5717907 |
Method and apparatus for generating a reset pulse responsive to a threshold voltage and to a sys |
February 10, 1998 |
| A reset pulse generating circuit is disclosed for generating reset pulses that are used for placing digital systems such as microprocessors into a known state upon power-up and when power fluctuations occur. The reset pulse generating circuit includes a memory circuitry and a counter |
| 5717693 |
Sonet payload pointer processing and architecture |
February 10, 1998 |
| A SONET network element receives incoming SONET signals with a receive line interface (2) which stores the incoming data in an elastic store at the recovered line rate while a local interface reads the stored data at the local network element rate, which may vary slightly from the recove |
| 5715248 |
Derivation of VT group clock from SONET STS-1 payload clock and VT group bus definition |
February 3, 1998 |
| A SONET formatter circuit (10) receives a parallel STS-1** TX signal (19) from a highspeed interface module. The STS-1** TX signal (19), which contains a floating VT group payload, is demultiplexed into seven parallel VT groups (33). These seven parallel VT groups (33) are converted to |
| 5710650 |
Dispersion-reducing multiple wavelength division multiplexing optical fiber transceiver and meth |
January 20, 1998 |
| A dispersion tolerant OC-192 optical transceiver includes the circuitry for implementing the method of reducing optical signal dispersion in a high data rate data stream that travels on an optical fiber communications system. The circuitry includes circuitry for partitioning the high dat |
| 5708687 |
Synchronized clock using a non-pullable reference oscillator |
January 13, 1998 |
| Digital signal processing techniques are used to synthesize a range of output frequencies locked to a non-pullable reference oscillator, and the synthesized output frequency is used in a slave low bandwidth phase-locked loop; by increasing digital resolution in a phase accumulation regis |
| 5706299 |
Sonet tributary ambiguity resolution for elastic store control |
January 6, 1998 |
| Read and write addresses on the local and line sides of a SONET elastic store are compared at least twice in order to determine any ambiguity in the comparison and, if so determined, foregoing any pointer adjustments that would otherwise have been made. |
| 5689608 |
Fiber optic assembly |
November 18, 1997 |
| A method of increasing the attachment bond strength between a first and second object comprising respective first and second materials is disclosed. Each of the first and second materials has a respective first coefficient of thermal expansion at an assembly temperature, and a second |
| 5689530 |
Data recovery circuit with large retime margin |
November 18, 1997 |
| A circuit for recovering a clock signal from incoming data and for retiming the incoming data comprises circuitry for generating a plurality of phased clock signals responsive to a selected frequency and clock recovery circuitry for generating a recovered clock from the plurality of phas |
| 5687014 |
Optical distribution shelf for a remote terminal of an optical fiber telecommunications network |
November 11, 1997 |
| In an optical fiber telecommunications network for providing both narrowband telephony signals and broadband video services over a single optical fiber using a single optical carrier, an optical distribution shelf includes a plurality of optical distribution units and interface units |
| 5666547 |
Method and apparatus for framing a serial data stream |
September 9, 1997 |
| A method and apparatus for identifying at least a portion of a framing pattern in a data stream comprising a plurality of sequential bits. In the method embodiment, the method includes the step of identifying a set of successive candidate bits wherein the identified candidate bits are sp |
| 5640512 |
Maintenance method and apparatus for providing a high-integrity, unidirectional, standardized AT |
June 17, 1997 |
| A high-integrity video distribution signal is provided unidirectionally from one network node to another network node according to a standard digital communications format (ATM; SONET; DS3) that defines digital signal communications in a bidirectional manner with equal bandwidth in e |
| 5638410 |
Method and system for aligning the phase of high speed clocks in telecommunications systems |
June 10, 1997 |
| A method and system are provided for detecting and measuring a phase difference, linearly over a range of 360.degree., between the output signals from a primary stratum clock module (100) and a standby stratum clock module (120) in a telecommunications system, calculating the amount |
| 5633892 |
Hybrid line coding method and apparatus using 4B/3T encoding for payload bits and 1B/1T encoding |
May 27, 1997 |
| Existing infrastructures such as DS1 or E1 are used at currently accepted rates to carry a third more information by using a hybrid encoding technique wherein a 4B3T encoding is done for the payload bits, while a 1B1T encoding technique is used for framing information. In this way, for |
| 5630270 |
Circuit board identification method |
May 20, 1997 |
| A circuit board having at least one operational characteristic. The circuit board includes a surface and a plurality of conductive pads accessible from the surface and for electrically coupling electrical components to one another. Further, the circuit board includes a plurality of attac |
| 5627837 |
Apparatus and method for suppressing protection switching in a digital communication system in t |
May 6, 1997 |
| A method and system for performing protection switching in a communications system is disclosed. The disclosed system and method include the ability to detect bit error burst conditions, in which data is highly errored over a brief time and responsive to which the protection switching pr |
| 5612980 |
Method and apparatus for fast lock time |
March 18, 1997 |
| A system and method for fast frequency locking are provided in which the phase difference between first and second synchronization signals is measured (22). The frequency difference between the two signals is then determined (24). The frequency of the second synchronization signal is |
| 5612862 |
Method and circuitry for controlling current reset characteristics of a magnetic amplifier contr |
March 18, 1997 |
| Magnetic amplifier post regulator (54) includes magnetic amplifier (42) that has a main magnetic amplifier winding, reset transistor (76), error amplifier (58), and auxiliary magnetic amplifier winding (220). Magnetic amplifier (42) controllably blocks a portion of the input voltage N.su |
| 5598493 |
Method and system for forming an optical fiber microlens |
January 28, 1997 |
| A method and system for forming microlens (78) on an optical fiber (60) include optical fiber lensing device (10) having lowering mechanism (18) for inserting optical fiber (60) at a predetermined and controlled speed to a predetermined depth in oil-acid bath having oil layer (62), acid |
| 5596804 |
Method of constructing an electromagnetically shielded microstrip circuit |
January 28, 1997 |
| A method of constructing a circuit for communicating electrical signals and assembled at least in part by an automated assembly machine is disclosed. The automated assembly machine is operable to select from a plurality of components. The circuit includes a material having a first and se |
| 5596614 |
Method and circuitry for aligning the phase of high-speed clocks in telecommunications systems |
January 21, 1997 |
| A method and circuitry are provided for detecting and measuring a phase difference between the output signals from a primary stratum clock and a standby stratum clock in a telecommunications system, computing a period of time needed for a numerically-controlled oscillator to shift the |
| 5594576 |
Optical serial bus interface |
January 14, 1997 |
| In an optical fiber transmission network, a remote terminal fed by a high-rate optical signal includes an internal electrical link called a serial interface bus carrying 24 DS0 channels. The optical transmission network is extended by converting the SBI baseband signal from electrical |
| 5592519 |
Dual frequency clock recovery using common multitap line |
January 7, 1997 |
| A circuit for recovering a clock signal from incoming data and for retiming the incoming data comprises circuitry for generating a plurality of phased clock signals responsive to a selected frequency and clock recovery circuitry for generating a recovered clock from the plurality of phas |
| 5579323 |
Virtual tributary/tributary unit transport method and apparatus |
November 26, 1996 |
| A virtual tributary (VT) or tributary unit (TU) of a selected size is multiplexed with transport overhead and further multiplexed with framing bandwidth of an underlying transport technology for providing a virtual tributary/tributary unit plus transport link overhead plus transport |
| 5576874 |
Optical distribution shelf for a remote terminal of an optical fiber telecommunications network |
November 19, 1996 |
| In an optical fiber telecommunications network for providing both narrowband telephony signals and broadband video services over a single optical fiber using a single optical carrier, an optical distribution shelf includes a plurality of optical distribution units and interface units |
| 5572614 |
Method and apparatus for aligning a separately supported fiber tip and fiber communications circ |
November 5, 1996 |
| A method and apparatus for aligning a fiber tip of an optic fiber in position with respect to a fiber communications circuit disposed on a carrier having a planar surface. In the method, the steps include supporting the optic fiber with a block having a planar surface such that a mov |
| 5572347 |
Switched video architecture for an optical fiber-to-the-curb telecommunications system |
November 5, 1996 |
| Switched video broadband service and narrowband telecommunications service are integrated and provided directly to subscribers. A plurality of video channels are provided to a central office by a video service provider, and said video channels are transmitted to a remote terminal using s |
| 5557265 |
Method and system for indicating an optical transmit amplifier fault |
September 17, 1996 |
| Optical transmit amplifier (24) fault indicator system (46), (78), and (80) indicates the failure of optical transmit amplifier (24) and includes an input loss circuit (46), an output failure circuit (80), and a modulation detector circuit (78). The modulation detector circuit (78) recei |
| 5553308 |
Serial communication format and methodology |
September 3, 1996 |
| A method of communicating serial information from a source to a destination is disclosed. In one embodiment, the method involves numerous steps for communicating serial information from a source to a destination. First, transmission is commenced of a serial stream of status information f |
| 5528530 |
Calculation apparatus for performing algebraic and logic computations using iterative calculatio |
June 18, 1996 |
| A desynchronizer (20) for desynchronizing data stored within synchronous payload envelopes of a synchronous communication protocol such as SONET (Synchronous Optical Network), provides for smoothing the periodically discontinuous clock signal associated with that data after the synchrono |
| 5528283 |
Switched video distribution apparatus |
June 18, 1996 |
| A communication system is provided for the distribution of switched video, along with telephony and control information, over fiber from a central office to a subscriber premises. The system can dynamically allocate video channels to subscribers using a pool of switched channel selector |
| 5521808 |
Method and circuitry for controlling start-up characteristics of a magnetic amplifier control ci |
May 28, 1996 |
| Start-up control circuit (152) regulates the output voltage (V.sub.OS) of a power supply circuit (150). Magnetic amplifier control circuit (54) includes magnetic amplifier (42) and error detection circuitry (58, 68, and 70). Start-up control circuit (152) includes sensing circuitry (76 a |
| 5512936 |
Video line card switch for use in a video line card shelf in a switched video system |
April 30, 1996 |
| In a telecommunications system providing switched video services, a video line card includes a switch arrangement for selecting a plurality of channels from a greater plurality of available channels and for providing said selected channels in a fixed bandwidth that may be received by a |
| 5509952 |
Method for bonding a fiber to a sleeve for fiber optic packaging applications |
April 23, 1996 |
| In one embodiment, the present invention includes a method of increasing the attachment bond strength between a first and second object comprising respective first and second materials. Each of the first and second materials has a respective first coefficient of thermal expansion at an |
