Lucent Technologies Inc.

Western Electric Company, Inc.

At&t Technologies, Inc.

American Telephone and Telegraph Company, At&t Technologies, Inc.

John Tardy

Charles Calvin Byers

James Philip Runyon

John Donald Unruh

Mary D Miller

Shella A Paskel

A method and system for asynchronously transporting narrowband and broadband transmissions over a link includes providing at least one host terminal or at least one network unit for receiving and transmitting communications over a transmission line. Narrowband transmissions are converted to and from composite asynchronous transfer mode (ATM) cells by separating data and signaling of each channel into separate byte positions in the composite ATM cells. The composite asynchronous transfer mode (ATM) cells are transferred over the transmission link. The composite asynchronous transfer mode (ATM) cells include both narrowband and broadband composite cells such that an entire bandwith of the transmission line is available for both narrowband and broadband transmissions.

Transporting voice telephony and data via a single ATM transport link

In the network of the invention, telephony and other narrow band services are provided using twisted pairs via existing fiber-in-the-loop (FITL) technology while the analog video and digital broadcast video are carried over a single coaxial cable to the customer premise. All customer subscriber lines are moved out of the central office and are distributed in the outside distribution plant via FITL technology. Data and digital video from the central office are distributed to a large number of field located optical network units (ONU) as ATM signals over optical fibers. The narrowband signals are converted to a SONET virtual tributary group and are combined with the digital video signals for delivery to the home.

Method and apparatus for converting synchronous narrowband signals into

An off-line regulating power supply utilizes a regulating transistor which perates in a dissipative mode for only a portion of each half cycle of an input AC voltage in order to regulate an output voltage by truncating the input AC sinewave. This AC input signal is full wave rectified and coupled to a primary winding of a power transformer through the regulating transistor. One of a plurality of secondary windings is coupled to a voltage threshold detector which responds instantaneously to attainment of the threshold in each half cycle of operation to bias the regulating transistor from a saturated condition to an active dissipative impedance state which limits the output voltage to the threshold level. As the input AC sinewave peaks and declines in value, the regulating transistor is again biased into saturation when the voltage applied to the threshold detector drops below the threshold level.

Off-line series type regulating power supply

In the manufacture of electrical coils (10), particularly large transformer coils, an insulated wire (11) is wound on a rotatable winding arbor (12) so as to form a succession of turns of the insulated wire. Particularly when large gauge enamelled copper wire is wound, the insulation (14) has a tendency to crack or chip during the winding process, causing shorted turns and producing a defective coil. This disclosure relates to systems for testing such a coil to detect a short as it is wound so as to permit interruption of the winding process and repair of the insulation fault on the spot. The test equipment includes a pair of test windings (41, 42) positioned at opposite ends of the winding arbor (12) and magnetically coupled by flux paths (50, 51) to each other and to the coil being wound so that an A.C. input signal (V.sub.1) applied to the first winding (41) induces an A.C. output signal (V.sub.2) in the second winding (42) that undergoes a characteristic change, such as a voltage drop, when a short occurs. A detecting circuit (60) senses such a change in the output signal and provides an output (63) when a shorted turn is detected. Preferably, a parallel shunt return path (70) is provided between the arbor and the machine frame so as to increase the sensitivity of the detector circuit.

Apparatus for testing the integrity of an electrical coil as it is wound

In the manufacture of electrical coils (10), particularly large transformer coils, an insulated wire (11) is wound on a rotatable winding arbor (12) so as to form a succession of turns of the insulated wire. Particularly when large gauge enamelled copper wire is wound, the insulation (14) has a tendency to crack or chip during the winding process, causing shorted turns and producing a defective coil. This application relates to systems for testing such a coil to detect a short as it is wound so as to permit interruption of the winding process and repair of the insulation fault on the spot. The test equipment includes a pair of test windings (41, 42) positioned at opposite ends of the winding arbor (12) and magnetically coupled by flux paths (50, 51) to each other and to the coil being wound so that an A.C. input signal (V.sub.1) applied to the first winding (41) induces an A.C. output signal (V.sub.2) in the second winding (42) that undergoes a characteristic change, such as a voltage drop, when a short occurs. A detecting circuit (60) senses such a change in the output signal and provides an output (63) when a shorted turn is detected. Preferably, a parallel shunt return path (70) is provided between the arbor and the machine frame so as to increase the sensitivity of the detector circuit.

Growing community of inventors

Somerville, NJ, United States of America

John Tardy