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| Number | Title | Issue Date |
| 7161377 | Bus type connection system in particular for backplanes The invention relates to bus type connection systems, in particular those for wiring backplanes of electronic systems, when the bus comprises connectors distributed in an irregular manner. It consists in selecting segments (D1, D2) over which t... | 01/09/2007 |
| 6937717 | Low power signal detection The present invention provides a low power method and apparatus for detecting a signaling tone. The apparatus comprises a resonator which can be configured to resonate at a specified frequency, a controller for configuring the resonator, and a comparator for compari... | 08/30/2005 |
| 6791977 | Reclocker circuit and router cell An improved reclocker circuit and router cell are provided that are particularly useful when configured into a router matrix comprising a plurality of interconnected router cells. The improved reclocker circuit includes an integral N-to-1 multiplexer (MUX), wherein ... | 09/14/2004 |
| 6631187 | Method for controlling diversion in telecommunication The present invention relates to a control method for a call-forward procedure in telecommunications, in which method calls placed on a user's home address are forwarded to a new target address. According to the invention, the final activation step of the... | 10/07/2003 |
| 5995616 | Apparatus for communication between a telephone exchange and connected telephone sets In the connection of a number of telephone sets to a private branch exchange, control information is communicated between the telephone sets and the exchange set in such a way that a bidirected conversion unit is required. In order to provide a high degre... | 11/30/1999 |
| 5426696 | Method of improving receiver sensitivity and speech immunity with DTMF-reception A method of improving the sensitivity and speech immunity of a receiver in conjunction with DTMF-reception is disclosed. The number of zero-crossings of the input signal are counted during one of a number of measuring intervals in real time at frequencies... | 06/20/1995 |
| 5402479 | Method and apparatus for translating signaling information An office interface unit (OIU) transfers data and signaling between a telephone local exchange and distribution lines. Information from the telephone local exchange is contained in repetitive frames containing signaling time slots which each contain two d... | 03/28/1995 |
| 5331667 | Telephone exchange apparatus with communication line clocking In a telephone exchange apparatus which accommodates digital communication liens and employs a slave synchronization system in which a clock is extracted from a signal received from the network, an exchange switch is operated in synchronism with the extra... | 07/19/1994 |
| 5185738 | Fiberoptic telephone systems A telephone network with distributed processing capabilities. A local controller is provided for monitoring status of a plurality of users. A primary controller performs circular polls of the local controllers to determine status changes. The system opera... | 02/09/1993 |
| 4987591 | Electronic telephone apparatus able to supply sync clock signals reliably, and method of controlling the supply of sync clock signals An electronic telephone apparatus comprising a trunk circuit, a sync signal generating circuit, an oscillator circuit, a selector, and a time-division switch. The trunk circuit is connected between a digital line and a highway, for transmitting signals th... | 01/22/1991 |
| 4858231 | Bus interface loading assembly A bus interface loading assembly used to equalize electrical loads of termination slots on a backplane assembly is disclosed. It is comprised of loading means adapted to be converted on said backplane at unused slots thereof. The loading means is also adp... | 08/15/1989 |
| 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 |
| 4811333 | Substantially non-blocking space switching arrangement A telephone exchange, now often called a switch, includes a switching network of the space division type which switches PCM highways, and includes a number of sub-networks (SEG1, SEG2 . . . SEGN) each of which is a plural (e.g. three) stage array. When a ... | 03/07/1989 |
| 4792970 | Expansion port for use in a communication system A system for expanding the number of signal ports accommodated by a base communication system having one or more switching circuits for interconnecting a plurality of local signal ports via a multiple line signal bus under control of a central controller.... | 12/20/1988 |
| 4710952 | Distributed control type electronic switching system The invention relates to a distributed control-type electronic switching system which includes a first group of processors paired for act/standby redundancy, and a second group of master processors which are provided as single units. The first group of pr... | 12/01/1987 |
| 4638123 | Circuit arrangement for a small PABX with a switching matrix that has electronic crosspoints In a small PABX with a switching matrix that has electronic crosspoints, integrated selector components comprising multiplexers or demultiplexers in C-MOS technology are used for the switching matrix. By means of individual dialing connection points, whic... | 01/20/1987 |
| 4626628 | Telephone line circuit having time-shared DTMF receivers The invention provides a circuit and method for the time-sharing of a DTMF tone receiver. A DTMF receiver has its input terminal connected to a common output terminal of a pair of transmission gates, each gate having an input terminal connected to a respe... | 12/02/1986 |
| 4603235 | Dynamic event selection network This invention describes a method for mapping one or more of a number of input events to one or more of a number of output functions. This method involves the use of a memory device to perform the mapping between the input events and the output functions.... | 07/29/1986 |
| 4535444 | Digital switching exchange for telephone systems A digitally operating telephone exchange or central office comprises at least one elemental switching assembly AC including a multiplicity of routing modules MII interconnected by PCM lines FII, each module communicating directly with one or more interfac... | 08/13/1985 |
| 4513415 | Broadcast synchronization and supervision system A system is disclosed which employs existing broadcast stations to transmit synchronizing and supervisory signals for use by telephone communication devices at remote locations for timing purposes and for coordinating their activities with activities at o... | 04/23/1985 |
| 4510601 | Digital frequency receiver A digital frequency receiver connected to a processor for the recognition of multifrequency code signals received in signalling time slots and transmitted to the receiver in digital form by at least one time multiplex link. The receiver includes means (MO... | 04/09/1985 |
| 4493076 | Security system for a distributed control exchange A security system for an exchange having distributed control. Exchange control is distributed among a plurality of microprocessors and in microprocessor terminal units connected to a time-division switching network. The security system is organized on thr... | 01/08/1985 |
| 4482997 | Arrangement for reducing clipping in a digital conference arrangement For use in a multichannel time division multiplexed conference arrangement where the samples in one time frame of simultaneous speakers are summed for distribution to each of the conferees, the disclosed arrangement reduces the amount of speech that is of... | 11/13/1984 |
| 4481624 | Linear time division multiplexed conferencer There is disclosed a linear time division multiplexed time slot conference for continuously summing and outputting digital message samples received from n connected telephone lines respective to m sequential time slots. The conferencer processes 256 time ... | 11/06/1984 |
| 4477697 | Method and circuitry for encoding telephone ringing signals The method and apparatus encodes telephone ringing to identify both the origin and destination of a received call. The ring envelope of the ringing signal is divided into two segments. During the first segment, call origin information is encoded by varyin... | 10/16/1984 |
| 4455645 | Back-up control system implemented with a redundancy scheme for protection against failure A back-up control system of a redundancy configuration suited to be used for a time division switching network. The control system includes connecting paths extending from each of the load supply devices, the paths being classified into an active connecti... | 06/19/1984 |
| 4440986 | Microprocessor controller for simultaneously controlling a PBX and providing multiple user access for general purpose data processing A microprocessor controller has a central processor, including a microprocessor, to centrally control a PBX and also provide general processor capability to a plurality of data terminals. Any typical centrally controlled PBX design which processes and swi... | 04/03/1984 |
| 4339633 | Modular telecommunications system A telecommunications system for both PABX and key systems use. The system is assembled in modules capable of physical and electrical interconnection and expansion. The system has a control apparatus housed in one modular sectional unit. The stations of the sys... | 07/13/1982 |
| 4322581 | Multifunction telephone with message information and control information circuits for connecting stations and common equipment in a telephone network A private telephone network that includes multifunction telephones. Multifunction telephones are connected to common equipment by a voice signal path and a data signal path. Supervisory information passes over the data signal path in the form of polled me... | 03/30/1982 |
| 4286118 | Data distribution system for private automatic branch exchange A data distribution system for a private branch telephone exchange for providing information to a plurality of PBX stations. Two embodiments (serial and parallel) including addressable stations are shown. Memory devices driving a plurality of displays at ... | 08/25/1981 |
| 4256927 | Space division switching system for communication networks using optical signal frequencies According to a feature of this invention, there is provided a space-division and control system for a network operating with space-division switching of information modulating optical carrier frequencies, wherein the switches are arranged between a plural... | 03/17/1981 |
| 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 |
| 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 |
| 4197427 | Dual-processor line concentrator switching system A switching system is disclosed for the concentration of a plurality of telephone lines onto a lesser plurality of intermediate trunks, wherein an independent processor is included at both ends of the concentrator system. These processors communicate with... | 04/08/1980 |
| 4186278 | End-of-keying control circuit A TOUCH-TONE signal to dial pulse converter arrangement isdisclosed in a step-by-step system. The arrangement is equipped with a plurality of trunk circuits interposed between line finder and selector switches for extending calls from TT (TOUCH-TONE) tele... | 01/29/1980 |
| 4184118 | Base station feedback reporting system The operational status of equipment located at a base station is reported to a remote control terminal. The same audio channel that is used for sending audio signals and control signals to the base station is also used to carry the report signal. The cont... | 01/15/1980 |
| 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 |
| 4166199 | Attendant console complex An operator complex in which control signals relating to key lamp and alphanumeric display operation and key transition data are carried between the operator console and the PABX system on a multiplex highway or radio transmission link to permit virtually... | 08/28/1979 |
| 4165447 | Centralized data-registration equipment for traffic supervision in telecommunication system To facilitate the supervision of long-distance telephone traffic over an extended area, output signals from call monitors associated with a number of trunk lines are fed to respective detectors working into a common preprocessor in which certain parameter... | 08/21/1979 |
| 4156109 | Electronic traffic measuring, sorting, and recording device The invention described is an electronic device for traffic measurement in telecommunication networks. The device measures the two main parameters of the carried load, known mathematically as the mean and variance of the number of calls in progress from w... | 05/22/1979 |
