Abstract: An overvoltage-tolerant self-biasing input/output buffer circuit having a p-channel field-effect transistor ("FET"), a first n-channel FET and a biasing circuit for biasing the body of the p-channel FET so as to prevent forward-biasing of the of the p-channel FET. The p-channel FET has a source connected to a first voltage, a gate connected to a first input, a drain connected to an output, and the body connected to a node. The first n-channel FET has a drain connected to the output, a gate connected to a second input, a body connected to a second voltage, and a source connected to the second voltage. The biasing circuit includes a second n-channel FET and a third n-channel FET. The second n-channel FET has a source and a gate connected to the first voltage, a drain connected to the node, and a body connected to the second voltage. The third n-channel FET has a drain connected to the node, a gate and a source connected to the output, and a body connected to the second voltage.

Abstract: A system for transmitting information over an OFDM channel using phase shift keying encoding employs a bit mapping encoder to reduce the crest factor (ratio of peak voltage to RMS voltage). For a 16 subchannel OFDM system using QPSK encoding, a first set of four symmetrically positioned pairs of subchannels is used to encode two bits of information on each subchannel. A second set of four symmetrically positioned pairs of subchannels is used to encode only one bit of information on each subchannel, with the resultant phasor for each pair of the second set of pairs of subchannels being orthogonal to the resultant phasor for one of the pairs of the first set of subchannels. With this arrangement, the crest factor is reduced.

Abstract: A method to be used in a Source Routed Bridged LAN by which access points maintain location information of mobile stations, and forward packets destined for mobile stations that have moved to another access point. This method resolves the problem that correspondent stations do not (timely) update the routing information to the mobile stations.

Abstract: Method and apparatus for the active cancellation of broad band noise and/or single frequency tones emanating from rotating machinery, such as an air moving device, by detecting related mechanical and acoustic signals therein and causing canceling vibrations to be applied directly to the rotating machinery by a transducer.

Abstract: A zone analysis system and method (211) optimize speed and minimize adverse effects resulting from noise in an inspection system (90) for measuring disparity between two surfaces. In particular, the zone analysis system and method (211) can be implemented in an inspection system (90) for contactlessly measuring undercut or protrusion of an optical fiber (26) relative to a surrounding support material (36) at the endface (79) of an optical fiber termination (37). In structure, the inspection system (90) has a measurement apparatus (91) with an interferometer (98) controlled by a machine vision system (92) for determining the degree of disparity. The inspection system (90) measures an offset of an interferometric fringe (113') produced by the interferometer (98) over the target (82) in the image in order to determine the disparity. Further, the machine vision system (92) employs the zone analysis system and method (211) for optimizing the performance thereof.

Abstract: A method for forming a grating in a photosensitive medium such as a photosensitive optical fiber. The method comprises impinging a pair of interfering, actinic beams onto the medium, and during the impinging step, advancing the illuminated portion of the interference pattern relative to the medium. The advancement is carried out without changing the phase, or registration, of the interference pattern. According to one embodiment of the invention, a grating having a spatially dependent period is produced by varying the wavelength or the intersection angle of the actinic beams during the advancement. According to a second embodiment of the invention, a grating having a spatially dependent refractive index perturbation is produced by varying the dose of actinic radiation received by the medium during the advancement.

Abstract: A direct-view display comprising an array of micro-mechanical modulators is disclosed, he modulator used to form the display comprises a suspended, vertically moving membrane and a substrate. The device functions based on optical interference effects between the membrane and the substrate which cause the modulator to either substantially reflect or absorb an optical signal. The interference effects are a function of the size of the air gap between the membrane and substrate, which varies as the membrane moves. The membrane moves in response to a data signal, representative of an image, delivered to the modulator. The display generates an image based on the pattern of light and dark sections of the display corresponding to the reflectivity of each modulator at a given point in time.

Abstract: A universal grounding clip for use with a cable having a frame assembly with a first end and a second end, a base member form at the first end of the frame, and a pair of leg members extending from the first end of the frame toward the second end of the frame where a crossmember is positioned and extends between each of the leg members, thus defining a central opening through the frame adapted to receive a cable. A pair of opposed grip members are supported in the opening, and are adapted to be moved toward each other for affixing a cable to the frame. Each grip member has a pair of bifurcated legs having, on either side of the bifurcation, an arcuate toothed leg portion adapted to grip the cable. At least one ground wire opening is defined in the base member and extends therethrough adapted to simultaneously fasten a ground wire to the frame as the grip members affix the cable to the frame.

Abstract: An inductive structure is provided which displays an increased self-inductance and improved Q at high frequencies. The improvement resides in the disposition proximate the inductive structure an amount of magnetic material to increase mutual inductance between adjacent portions of the inductor's conductive path with current flow.

Abstract: The invention is a test method for testing ISDN interfaces from a remote location. The test method of the invention applies predetermined energy signals to the tip and ring leads of the customer subscriber line in a prescribed sequence, delays 10 to 100 ms, and then makes measurements of the voltage across the tip and ring leads. The voltage measurements are compared to limit values identified from the NT1-U dc characteristic curve to determine pass/fail of the tested interface.

Abstract: A high performance isolated gate drive circuit for driving MOSFET is disclosed which uses a MOSFET pull-down device, provides unusually low gate discharge impedance, exceptionally fast turn-off of the controlled switch and reduced power dissipation in the overall gate drive circuit. It also provides superior off-time noise immunity.

Abstract: A noncontact fiber cleaning and tensioning device for cleaning optical fibers of dust and other particulate matter collected thereon. The noncontact fiber cleaning and tensioning device includes a housing formed from a cleaning and an exhaust section and includes a fiber passage formed therethrough and through which the optical fibers are passed. A series of spray nozzles are mounted to the cleaning section of the housing, and communication with the fiber passage and direct fluid sprays under pressure against the fiber as the fiber moves through the fiber passage to dislodge dust and particulate matter therefrom. A vacuum means is connected to the exhaust section and draws the dust and particulate matter dislodged from the fibers by the fluid sprays through the fiber passage and out through the exhaust housing to exhaust the dislodged particulate matter for collection and removal under controlled conditions.

Abstract: A method and a system are provided to determine the optimum non-congested path to connect two termination points on a distributing frame with a specific type of jumper cable. The length of the jumper cable to be routed through the path is calculated and subsequently a measurement of the same cable and associated slack is displayed on a screen along with the non-congested path with a representation of the cable and slack therein.

Abstract: A method and apparatus for managing a virtual circuit network is disclosed that enables hand-off management. An illustrative embodiment establishes a virtual ciruit by receiving, at a radio port, a virtual circuit identifier from a wireless terminal and attaching the virtual circuit identifier to an OA&M cell. The radio port then transmits, over a pre-established unidirectional virtual ciruit, the OA&M cell to a radio port manager.

Abstract: A tunable tandem Fabry-Perot etalon in used in optical systems as a filter between two amplifier stages. The etalon filters the signal going from the preamplifier to the amplifier and provides further filtering as the output of the amplifier also passes through the etalon.

Abstract: A plurality of telecommunication switches are coupled to agent communication terminals (ACTs) which are used by agents for handling incoming calls. An integrated control system is coupled to the ACTs and controls the distribution of incoming calls among the ACTs. An intelligent node in the system can access an agent queue that stores data indicating availability of ACTs to handle the call and a call queue which stores data concerning calls waiting for ACD service. A database stores processing instructions for the handling of incoming calls based on data contained in the agent and call queues, and subscriber specified instructions.

Abstract: Systems and methods for performing phonemic synthesis which operate to generate an output data set of acoustic B parameters from a received textual data set wherein the output data set represents patterns of transition from one speech excitation state to another. The textual data set is converted to a plurality of phonetic data sets, at least one phone descriptor is assigned to each of the phonemic data sets, and the output data set is generated by processing the phonetic data sets as a non-linear function of a speech excitation control variable whereby the collective contributions of the phonetic data sets are determined for each pattern of transition from one speech excitation state to another. The speech excitation control variable represents selected portions of a human vocal system.

Abstract: Disclosed is a combined RF/power tap unit. The power and RF portions are provided in separate compartments with a cover for the power compartment so that access to the internal RF circuitry is possible without disturbing the power compartment. The cover for the power portion extends beyond the sides of the compartment, and the compartment includes appropriate grooves and seals to protect the wire connections from the outside environment. Detents are provided in one side of the compartment to hold the drop wires, and ribs in the cover supply strain relief.

Abstract: An optical fiber support member is made by forming on a monocrystalline silicon substrate member (26) a first mask layer (27) of, e.g., silicon dioxide. The first mask layer is masked and etched to a first depth to define a pattern of first (29) and second (30) features, the first features defining the locations of optical fiber support grooves (15), and the second features defining the locations of support member reference surfaces (17, 19). Next, only the second features are etched to a second depth deeper than the first depth. Finally, the first and second features are simultaneously etched into the substrate such that the second features are etched to a greater depth than the first features. By defining the first and second features simultaneously in a single mask and etch step, one can assure the final precise alignment of etched V-grooves to etched reference surfaces.

Abstract: WDM optical fiber communications entails bidirectional transmission with at least two WDM channels in opposite transmission directions in a single fiber. As compared with unidirectional transmission, a number of capacity-limiting considerations are relaxed. Operation using in-ground dispersion-shifted fiber permits system capacities of conventional unidirectional WDM.