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| Number | Title | Issue Date |
| 7315162 | Reducing power consumption of electrical meters The invention contemplates an electrical power meter and method of operating the electrical power meter. The inventive power meter includes a power supply for converting alternating current (AC) voltage to a direct current (DC) voltage for powering the electronic co... | 01/01/2008 |
| 7231211 | Apparatus and method for monitoring a trunked radio communications system The present invention provides a method and apparatus for monitoring a trunked radio communications system by using some type of radio scanning receiver that is not designed for that purpose. In addition, the invention provides a method for automatically determining... | 06/12/2007 |
| 6337906 | Apparatus and method for coupling an automated attendant to a telecommunications system An apparatus and method for coupling an automated attendant to a telecommunications system. The apparatus includes a switching device which establishes connection between a plurality of trunk lines of an existing telecommunications system and a plurality ... | 01/08/2002 |
| 6275578 | Method and apparatus for providing back-up, in-band signaling in a communications network A method of detecting and recovering from an out-of-band signaling failure in a telecommunications network involves the reprogramming of switching centers to utilize existent inband signaling capabilities to temporarily replace the failed out-of-band capa... | 08/14/2001 |
| 5263081 | Method and apparatus for providing on-hook transmission for digital loop carrier channel units On-hook VF transmission through a channel unit to a subscriber telephone instrument is provided by a control unit which generates control signals for the channel unit. The control unit responds to receipt of an "idle" code by creating commands which estab... | 11/16/1993 |
| 5247574 | Adaptive no balance DX signalling circuit The no balance duplex signalling circuit eliminates the need for setting balance resistors and capacitors to match or be proportional to cable resistance and capacitance as was required of previous duplex signalling circuit designs. A microcomputer is als... | 09/21/1993 |
| 5222129 | Telephone charging signalling detector suitable for central office line interface circuits Detector for telephone charging signalling in the form of periodic pulses derived from alternating current signals at specific frequencies transmitted in analog form by means of a line (2) comprising two wires (A, B), for example to a central office line ... | 06/22/1993 |
| 4907261 | Universal DC signalling detector A DC signalling Detector (DCSD) circuit 10 for processing DC signalling information from a telephony loop. In accordance with the invention the DC signals are processed to indicate, during a first time interval, a tip lead at ground potential, a tip lead ... | 03/06/1990 |
| 4852157 | Multi-task state machine signalling translator Real-time conversion between two different A/B signal coding schemes based on the DS1 time division multiplex format is achieved by time sharing a programmable state machine. The time sharing is accomplished synchronously with the DS1 superframe such that... | 07/25/1989 |
| 4815124 | DX circuit An improved DX circuit may be connected to signaling and reference leads of a DX signaling link, without need to balance the internal impedance of the DX circuit against that of the external DX signaling link. The DX circuit senses the magnitude and direc... | 03/21/1989 |
| 4734935 | Communication system with remotely controllable signal receiving means A communication system having remotely controllable signal receiving means for automatically setting the receive function for a start-signal transmitted from a terminal device and for changing the receive function when the terminal device is changed. At s... | 03/29/1988 |
| 4563547 | Loop-start/ground-start line interface circuit A switchable common mode reference circuit for tip conductor and ring conductor line feed amplifiers provides a tip-ring common mode feedback reference for loop-start operations and a common mode fixed bias for ground-start operations. The functioning of ... | 01/07/1986 |
| 4126765 | Detector circuit for sensing battery polarity and loop closure A detector circuit for use in conjunction with a trunk circuit of a PABX telephone system interfacing with a central office providing for constant monitoring of normal or reverse battery application by the central office during the high impedance idle sta... | 11/21/1978 |
| 4110565 | Duplex telephone signalling system Disclosed is circuitry interfacing telephone branch or trunk lines to provide D.C. driving voltages in response to, for example, on-hook and off-hook signals from a telephone set. The disclosed circuitry employs both lines to transmit useful signalling in... | 08/29/1978 |
| 4065643 | Communication facility integrity checking arrangement Circuitry for integrity verification is provided to prevent a calling party from unknowingly remaining connected to a faulty trunk connection between an automatic switching office and an operator-assisted office. New circuit arrangements are added to the ... | 12/27/1977 |
| 4058685 | Interoffice loop supervision arrangement An arrangement for preventing false reseizures of loop-signaling, repeat coil-coupled interoffice trunk circuits for telephone switching systems is disclosed. In the prior art, false reseizures of an incoming trunk circuit can be caused by discharge of th... | 11/15/1977 |
| 4037120 | Electronic dipole for looping a telephone line An electronic dipole circuit operating at constant current, designed to be used for looping a telephone line from a private branch exchange is disclosed. The circuit comprises a first transistor with the current which is constant in the emitter circuit ow... | 07/19/1977 |
| 4002850 | Trunk adapter A trunk adapter is associated with a common control private automatic branch exchange telephone system for interfacing the system with a central office. Four different types of adapters are associated with the system to effect a ring-down incoming, loop s... | 01/11/1977 |
| 3940570 | Apparatus for combining a central telephone trunk line with a customer telephone trunk line A system for combining a central telephone trunk line with the trunk line of a customer exchange wherein said central telephone exchange is provided with means for separating the dial, talk, and ring functions into a first partial circuit for providing a ... | 02/24/1976 |
