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| Number | Title | Issue Date |
| 4645874 | Message routing through data communication networks A mechanized system distributing the access, test and communication functions to the point of testing, typically the centralized switching facility serving the telephone loops and equipment to be tested. Computer (200) stores information about each subscr... | 02/24/1987 |
| 4479196 | Hyperedge entity-relationship data base systems A data base management system is disclosed in which data entities are records representing nodes in an entity-relationship directed graph. The body of each node represents one of the physical entities to be utilized while the edges of each node represent ... | 10/23/1984 |
| 4403320 | Line status detection in a digital concentrator system A digital concentrator system for use with a plurality of digital carrier systems in the telephone subscriber loop plant is disclosed. The concentrator system comprises a central office terminal (100), a remote terminal (102), and an interconnecting digit... | 09/06/1983 |
| 4400663 | Shunt fault tester for multiconductor cable Apparatus, and associated methodology, for locating a resistive shunt fault between wires of a cable utilizes the virtual interconnection property of operational amplifier means (112) to cause the coalescing of geographically separated nodes within the ca... | 08/23/1983 |
| 4399402 | Resistive fault sectionalization A methodology, and associated circuitry, for locating a resistive shunt fault coupling the cable shield and the conductors of the cable pair under test comprises the steps of: (i) measuring the open-circuited DC resistance (A1 and A2... | 08/16/1983 |
| 4398284 | Concentrator in a subscriber loop digital carrier system A digital concentrator system for use with a plurality of digital carrier systems in the telephone subscriber loop plant is disclosed. The concentrator system comprises a central office terminal (100), a remote terminal (102), and an interconnecting digit... | 08/09/1983 |
| 4394756 | Generation of busy signals in a digital concentrator A digital concentrator system for use with a plurality of digital carrier systems in the telephone subscriber loop plant is disclosed. The concentrator system comprises a central office terminal (110), a remote terminal (102), and an interconnecting digit... | 07/19/1983 |
| 4390871 | Circuit for detecting reduction in power When the input power from a resistive source to a DC-DC converter decreases, the pulse width of the switching transistor increases for a given load. When the pulse width increases above a threshold (14), a Schmidt Trigger (36) will operate to generate a p... | 06/28/1983 |
| 4383316 | Apparatus for and method of collating partitioned time disordered synchronous data streams Digital carrier channels and switching systems in a telecommunications facility may be used to transmit a high-speed data signal between an originating end and a terminating end. At the originating end, the high-speed data signal is distributed either bit... | 05/10/1983 |
| 4380810 | Loopback test A digital concentrator system for use with a plurality of digital carrier systems in the telephone subscriber loop plant is disclosed. The concentrator system comprises a central office terminal (100), a remote terminal (102), and an interconnecting digit... | 04/19/1983 |
| 4373121 | Maintenance termination device Substantially identical, unique valued impedance termination networks (26,28) each comprising a resistor (32,38) and a capacitor (34,36) are connected between each telephone subscriber loop conductor (11,13) and ground at the entrance of the loop to the c... | 02/08/1983 |
| 4371919 | Load distribution among parallel DC-DC converters A control circuit (36) on the primary side of a converter senses the output voltage and is useful for modulating the drive pulse width of a switching transistor (30). An averaging circuit (78) averages the drive pulse and compares this average with an ave... | 02/01/1983 |
| 4371755 | Bridge lifter circuit The tip and ring leads (15,17) of a tip party transmission facility are reversed before connecting the separate channel units for the tip and ring party channels to bridge lifters (16,18) at the central office, thus permitting selective ringing. Tip party... | 02/01/1983 |
| 4370525 | Variable rate timing circuit A digital subscriber loop carrier system (FIG. 1) is disclosed in which voice information and supervisory signal information are encoded in pulse code form and multiplexed together into a single digital pulse stream for transmission between a central offi... | 01/25/1983 |
| 4361731 | Coin telephone control circuit Coins deposited in a coin telephone are collected or refunded by selectively discharging one of a plurality of capacitors (10,12) through a current limiter (46) for a period just long enough to operate the coin control relay (38) in the telephone. Use of ... | 11/30/1982 |
| 4361875 | Multiple tone detector and locator A system (1000) for estimating the frequency of a tone input utilizes sample rate reduction in successive stages and processing by digital cyclotomic filters at each stage. The tone input (2001) is first transformed in network (1100) to yield two quadratu... | 11/30/1982 |
| 4357701 | Digital concentrator terminal synchronization A digital concentrator system for use with a plurality of digital carrier systems in the telephone subscriber loop plant is disclosed. The concentrator system comprises a central office terminal (100), a remote terminal (102), and an interconnecting digit... | 11/02/1982 |
| 4348735 | Cyclotomic tone detector and locator A system (1000) for estimating the frequency of a tone input utilizes sample rate reduction in successive stages and processing by digital cyclotomic filters at each stage. The tone input (2001) is first transformed in network (1100) to yield two quadratu... | 09/07/1982 |
| 4340996 | Adjustable cable clamp An adjustable clamp (10) comprising a pair of substantially identical clips (15) is employed to align and retain a plurality of members, typically cables, in a stiff, planar arrangement to facilitate manipulation. Each clip comprises a ratcheting detail (... | 07/27/1982 |
| 4336467 | Voltage detector A direct current voltage detector is disclosed including a low-pass filter, an isolating diode and a threshold detector. The circuit is designed to be simple and inexpensive and causes no interference with foreign potential and leakage tests on a telephon... | 06/22/1982 |
| 4335348 | Cable conductor continuity tester with magnetically coupled drive means and sensor Apparatus, and associated methodology, for testing shielded, multipair cables to verify conductor and splice continuity comprises: means (120,122) for magnetically coupling excitation source (110) to the conductor (106) under test; and means (121,123) for... | 06/15/1982 |
| 4333156 | Broadband cyclotomic tone detector A system (1000) for estimating the frequency of a tone input utilizes sample rate restriction in successive stages and processing by digital cyclotomic filters at each stage. The tone input (2001) is first transformed in network (1100) to yield two quadra... | 06/01/1982 |
| 4327530 | Enclosure for electronic equipment A weatherproof enclosure for electronic equipment includes a base portion and a mushroom-shaped hood portion. When unlatched, the hood portion rises by spring action to permit full access to the electronic equipment mounted on the base portion. A moderate... | 05/04/1982 |
| 4326261 | Single tone detector Circuitry for detecting and estimating the frequency of a tone signal comprises: sampler (20) to discretize the tone signal into samples; discrete-time filter means (21) for processing the samples; control means (30) including oscillator (31) for driving ... | 04/20/1982 |
| 4325022 | Cable shield fault location using a capacitive-inductive coupler Apparatus, and associated methodology, for testing shielded, multipair cables to detect shield and bonding faults comprises: means (20) for inductively coupling excitation source (10) to pair grouping (16); and means (50) for capacitively coupling groupin... | 04/13/1982 |
| 4323733 | Range extender with variable gain for coin telephone loops A range extender with gain unit for coin telephone loops is disclosed. When coin control signals to be applied from a central office to the coin loop are detected, an amplifier circuit and a line feed circuit connected to the loop are disconnected thereby... | 04/06/1982 |
| 4320261 | Cable routing methods and apparatus A modularized main distributing frame system (100) for interconnecting outside plant cables (140-143) with central office equipment leads (230,231) includes an overhead racking arrangement to route tie cables (130,131) and the equipment leads to framework... | 03/16/1982 |
| 4312069 | Serial encoding-decoding for cyclic block codes Means for serially encoding and decoding cyclic block codes having minimal parity check bits and single error correcting capability are disclosed. Encoder (12) comprises: serial shift and divide means (4100, 4150, 4200, SA, S3, S4 and S5) for generating parity... | 01/19/1982 |
| 3986097 | Bilateral direct current converters Bilateral converters are disclosed which translate direct current voltages at one level to direct current voltages at another level. The same converter can also be used to translate direct current voltages at the second level back to direct current voltag... | 10/12/1976 |
| 3982070 | Phase vocoder speech synthesis system Disclosed is a system for synthesizing speech from stored signals representative of words precoded in accordance with phase vocoder techniques. The stored signals comprise short-time Fourier transform parameters which describe the magnitude and phase deri... | 09/21/1976 |
| 3980967 | Differential feedback amplifier with frequency-shaped reference signal The reference signal applied to the differencing network of a differential feedback amplifier is shaped to conform to the natural gain-vs-frequency characteristic of the principal amplifier. This serves to minimize the amplitude of the error signal that t... | 09/14/1976 |
| 3978291 | Automated main distributing frame system An automated main distributing frame system comprises a multistage network with each stage including passive switches on which cross connections are made by shared, automated actuators under computer control to thereby provide paths through the network. T... | 08/31/1976 |
| 3976958 | R-C signal dividers and signal filters A class of signal dividers and signal filters is disclosed comprising first and second wavepaths coupled at one end to a common input port and at their other ends to a summing network to form a sum signal, and to a differencing network to form a differenc... | 08/24/1976 |
| 3970954 | Digital frequency multiplier A circuit arrangement for multiplying the repetition rate of an input signal by digital techniques is disclosed. A digital counter driven by a high speed clock generates a count proportional to the input period. This count or a different count generated b... | 07/20/1976 |
| 3967273 | Method and apparatus for using pushbutton telephone keys for generation of alpha-numeric information The disclosure comprises a method and apparatus for using a pushbutton telephone keyboard in which a signal sequence representing a unique symbol is generated by pushing a first button on which the desired symbol is located, each button being labeled with... | 06/29/1976 |
| 3963905 | Periodic sequence generators using ordinary arithmetic Disclosed are signal generators for developing multilevel output signal sequences of a preselected period of repetition. In their general form, the generators comprise a shift register capable of storing multilevel signals, and feedback means. The feedbac... | 06/15/1976 |
| 3964059 | Method and apparatus for statistical counting A method and apparatus for counting a large number of events by storing in a register a smaller number statistically related to the large number. An estimate v is stored representing the actual number of events n according to a logarithmic relationship. The re... | 06/15/1976 |
| 3963869 | Parity framing of pulse systems A carrier system is described in which a number of pulse encoded signals are multiplexed on a single transmission and demultiplexed and decoded at a remote terminal for distribution to a number of receivers at that location. A similar multiplex system use... | 06/15/1976 |
