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| Number | Title | Issue Date |
| 7190769 | Apparatus for controlling operation of a recording device with a telephone instrument An apparatus for controlling operation of a recording device with a telephone configured for orientation in a first state and a second state includes: (a) an information conveying section for conveying information from the telephone to a recording locus in the recor... | 03/13/2007 |
| 7095824 | Instructive out-of-service telephone lines A method (10, 20) and apparatus (30) enables a customer (47) to distinguish between a dead or broken Internet Protocol telephone line and an out-of-service Internet Protocol telephone line. The method detects (11) a hook status of a devic... | 08/22/2006 |
| 7013007 | Computer telephony power supply method and apparatus A method for generating power signals within a telephone server coupled to a computer system via an interface bus or in-house power connector, to a maximum number of telephones, and to a telephone trunk, the computer system providing a primary voltage signal and a s... | 03/14/2006 |
| 6920220 | Pre-zero crossing signal generator for sinusoidal voltages with DC offsets such as telephone ring voltages A circuit for closing a relay when an active AC voltage connected to one of the contacts of the relay is approximately zero volts includes a monitoring circuit that monitors the active AC voltage and outputs a phase-shifted voltage that crosses zero volts at predete... | 07/19/2005 |
| 6137420 | Selective call radio receiver and a data transmission method In a selective call radio receiver, having a tone dialer function that can transmit as a tone signal a call number of a recipient accompanied by a message, during the transmission of the tone signal by a tone dialer, a pause signal is automatically insert... | 10/24/2000 |
| 5796817 | Hybrid circuit for an electric operating and scanning interface, applicable to electronic recorders of electromechanical telephone stations A hybrid circuit for an electric operating and scanning interface is especially applicable to electronic recorders of electromechanical telephone stations. The hybrid circuit controls voltage and current parameters on different elements of the station in ... | 08/18/1998 |
| 5675643 | Line card that provides remote line activation and soft dialtone A line card apparatus which provides soft dialtone and automated remote cross-connect capability, comprising one or more line interfaces and a switching matrix which can connect a plurality of lines to the one or more line interfaces. This switching matri... | 10/07/1997 |
| 5636262 | Interface scanning circuit An interface scanning circuit includes a current source at the input to a multiplexer. The current source includes a transistor disposed between two resistors, the second one of which limits reverse current. Also provided are an attenuating network includ... | 06/03/1997 |
| 5608791 | Group exchange port (GXP) A Group Exchange Port (GXP) is disclosed which provides an organized technique for passing control of live objects (e.g.; a telephone call, a robotic arm, flying aircraft, etc.) from a first application operating on and processing the object to a second s... | 03/04/1997 |
| 5577114 | Subscriber line control apparatus to concurrently detect change in line state for subscriber lines and determine validity of timer device A subscriber line control device utilizes a scan input table and a last look table. The scan input table stores respective current line states of a plurality of analog subscriber lines. The last look table stores respective preceding line states of the pl... | 11/19/1996 |
| 5471525 | Line status display system for telephone exchange system In a telephone exchange system accommodating a large number of communication lines, a line status display system is provided, which permits display of the status of a large number of lines in a limited display space of the terminal for scale reduction, is... | 11/28/1995 |
| 5200996 | Station controller for multi-line pick-up and automatic monitoring of telephone station moves A station controller for use with a centrex exchange in which the controller provides lamping signal control for the lamps of telephone stations forming multi-station pick-up groups and wherein the controller further provides cable pair information for us... | 04/06/1993 |
| 5083308 | Arrangement for determining switch port status at an adjunct processor An arrangement that enables an adjunct processor to determine the service status of switching system communication ports to which the adjunct processor is connected, without reliance on switch-to-adjunct status-conveying messages. In-service and idle ones... | 01/21/1992 |
| 4849962 | Communications control unit In communications control unit for sequentially scanning a plurality of line sets to which full-duplex lines are connected, for reading out line control word provided in correspondence to the line from a memory when a data transmission/reception request e... | 07/18/1989 |
| 4811014 | Circuit arrangement for telecommunications systems, particularly telephone switching systems, comprising information interrogating devices cyclically driving inquiry locations An interrogating device cyclically calling in information from various inquiry locations selects the various inquiry locations a different number of times, for which purpose addresses of the inquiry location are stored a different number of times in an in... | 03/07/1989 |
| 4785298 | Circuit arrangement for telecommunications systems, particularly telephone switching systems, comprising an information interrogating device which cyclically drives inquiry locations An interrogating device cyclically calling in an information from various inquiry locations controls the various inquiry locations differing in frequency to which end addresses of the inquiry locations are stored a different number of times in an interrog... | 11/15/1988 |
| 4744103 | Computer controlled multi-link communication system A multi-link communication system includes a number of stations and interconnecting audio links under the control of a central computer. Each station is addressable by the computer for connecting selected stations to a selected audio link for establishing... | 05/10/1988 |
| 4734933 | Telephone line status circuit A circuit for detecting a first plurality of status signals on a multiplicity of telephone lines and generating a second lesser plurality of control signals, less than the first plurality, in response thereto. Predetermined ones of the control signals are... | 03/29/1988 |
| 4631362 | Low resistance origination scan circuit An origination scan circuit for detecting circuit closure state in a loop circuit has a much lower impedance than does the typical loop circuit. Its source impedance is split into separate resistive parts for connecting opposite terminals of an office bat... | 12/23/1986 |
| 4600813 | Line concentrator A concentrator for telecommunication lines uses a crosspoint matrix (100) incorporating semiconductor switches. A number of subscriber lines (1-14) are inputs to the matrix, and a smaller number of trunk lines are outputs. A subscriber loop detector is co... | 07/15/1986 |
| 4593156 | Grounded tip detector A grounded tip detector for use in a subscriber line circuit detects and indicates a tip-to-ground condition in the SLIC. Hysteresis and RC filtering are provided to assure a sharp switch-over of the tip-to-ground detection output and a reduction in the e... | 06/03/1986 |
| 4539437 | Stored program power control system for improving energy efficiency for telephone sets connected into a local telephone communications system A stored program energy control system operates with the control of a telephone communications system to improve its energy efficiency by removing power from station sets and their associated visual indicators when they are inactive. Inactive station sets... | 09/03/1985 |
| 4383137 | Key telephone system with multiple processor control A key telephone exchange system comprises office line units connected to office lines, terminal units respectively connected to key telephone sets and a main control unit for changing connections between respective office line units and respective termina... | 05/10/1983 |
| 4336424 | Circuit arrangement for monitoring operating conditions of direct current devices The circuit arrangement monitors operating conditions of a group of direct current devices. The operating conditions are represented by different potentials occurring at a sampling connector of each direct current device. A first and a second selector uni... | 06/22/1982 |
| 4331956 | Control means for a solid state crossbar switch A control system for a solid state crossbar switch (10) which allows a plurality of switch control and interrogation functions to be implemented by time sharing related circuitry. The crossbar switch (10) includes a plurality of X ports (X1 -X | 05/25/1982 |
| 4327253 | Circuit arrangement for consecutively monitoring operating conditions of direct current devices The circuit arrangement monitors operating conditions of consecutively sampled direct current devices. The operating conditions are represented by different potentials occurring at a sampling connector of each different direct current device. A selector u... | 04/27/1982 |
| 4320259 | Electronic selector for telecommunications switching An improved telephone system selector unit employing an electronic control arrangement is capable of directly replacing or being added on to existing electro-mechanical switching arrangements of the Strowger or other types which position themselves direct... | 03/16/1982 |
| 4282408 | On-hook/off-hook detector circuit An on-hook/off-hook detection circuit comprises a light-emitting device 54 connected across the tip T and ring R leads of a subscriber's telephone set 50 and between current source 56 and ground 57. A photo-transistor 60 is optically coupled to the light-... | 08/04/1981 |
| 4220824 | Interface linking synchronous sense and drive matrices of telephone system with a processor of signalization data Sensors SE and drivers AT electrically linked to various points of communication equipment, e.g. in a telephone system, are periodically explored by an interface linking them with a processor, under the control of a time base successively reading out thei... | 09/02/1980 |
| 4216355 | Telephone line monitoring apparatus An apparatus is disclosed for monitoring the busy or free condition of telephone subscribers' lines, comprising a number of bridge circuits, each connected to one of the subscribers' lines. Each bridge circuit includes a discriminator which generates a si... | 08/05/1980 |
| 4211895 | Electronic telephone system with time division multiplexed signalling An electronic telephone system has a plurality of extensions connected radially to a central equipment by respective cables each providing separate speech and signalling paths. Each of the signalling paths is provided by a balanced conductor pair terminat... | 07/08/1980 |
| 4196316 | Program controlled communication system having individually rearrangeable line selection A small program controlled communication system is disclosed having user changeable feature and line selection control. Associated with each station is a set of switches which are used to associate the various central office lines with the available nonlo... | 04/01/1980 |
| 4176256 | Circuit arrangement for time-dependent monitoring of the state of lines Circuit arrangement for time-dependent monitoring of the condition of lines with a scanning device operating with the so-called "last-look" method, which recognizes condition alterations on the line and which produces a message supplemented by the address... | 11/27/1979 |
| 4174466 | Multi-party telephone system allowing speech connection between extensions as between extensions and an outer line A multy-party telephone system for the connection of telephone sets by a small number of wires has arrangements for achieving the exchange of information by digital signalling between the telephone sets and a control unit included in a exchange unit of th... | 11/13/1979 |
| 4150258 | Electronic switching system In a telephone exchange system comprising a time division exchange system and space division concentrators connected to said exchange system with a PCM lines, said concentrators are controlled by said exchange system, thus those volume of hardware in the ... | 04/17/1979 |
| 4140880 | Hold tone scanner The lines or stations of a multi-line office telephone system are sequentially examined to detect a hold tone signal of a specified frequency or frequencies on one or more of the lines. The lines are examined for increasingly longer time periods in accord... | 02/20/1979 |
| 4139739 | Telecommunications call back system A centrally located processing unit controls the use of long-distance communication circuits and records the use of the circuits. The centrally located processing unit selects the least expensive telephone line available and instructs the remote satellite... | 02/13/1979 |
| 4117278 | Service observing terminal A terminal for use in a service observing system which collects service observing data at a plurality of geographically dispersed locations and forwards the collected information to a central unit for evaluation. Terminal apparatus at each location scans ... | 09/26/1978 |
| 4113989 | Electronic telephone system featuring switching networks having thyristors for single-wire switching An electronic telephone switching system is described having peripheral units including a plurality of subscriber and line circuits, a plurality of trunk and tie line circuits, at least one attendant line circuit, a plurality of signaling tone receivers, ... | 09/12/1978 |
| 4105873 | Electronic telephone switching system comprising a speech path switching matrix and tone-connecting switching matrix and employing electronic crosspoint switches An electronic telephone switching system is described having peripheral units including a plurality of subscriber and line circuits, a plurality of trunk and tie line circuits, at least one attendant line circuit, a plurality of signaling tone receivers, ... | 08/08/1978 |
