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...When G.G. Hubbard learned of his future son-in-law's invention, he called it "only a toy." His daughter was engaged to a young man named Alexander Graham Bell.
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| Number | Title | Issue Date |
| 7424011 | Rearrangeably nonblocking multicast multi-stage networks A rearrangeably nonblocking multicast network includes an input stage having r1 switches and n1 inlet links for each of r1 switches, an output stage having r2 switches and n2 outlet links for each of r2 | 09/09/2008 |
| 7248680 | Computer-based method and apparatus for controlling, monitoring, recording and reporting telephone access A telephone station interface is provided with apparatus for detecting when a called party has or is attempting to patch or bridge one telephone call with another telephone call. The detecting of such bridging or conferencing is accomplished through the detection of... | 07/24/2007 |
| 7203306 | Apparatus and method for providing switching at a telephone cross-connect A cost-effective technique for inserting a switching module into a line pair of a local telecommunications network is disclosed. In particular, the illustrative embodiment does not replace a punch-down block at a cross-connect, but rather inserts the switching modul... | 04/10/2007 |
| 6614904 | Apparatus and method for effecting a communication arrangement between switch arrays An apparatus is disclosed for effecting a communication arrangement of a plurality of communication circuits between first connection loci of a first switch array and second connection loci of a second switch array. The apparatus comprises: (a) a first co... | 09/02/2003 |
| 6597784 | Compact distributing frame with automated interconnection capability An automatic main distributing frame, which can easily maintain the size accuracy required to insert into a through hole of the conductive pin is provided. The main distributing frame includes a frame body, plural matrix switch boards accommodated in the ... | 07/22/2003 |
| 6510222 | Miniature connector array A line multiplier is formed of n upstream lines and m downstream lines where m>n by providing a micro-technology array of m×n crosspoints switches using, e.g., magnetic latching, wherein the latching magnets are heated to the Curie temperature to cause t... | 01/21/2003 |
| 5798580 | Contention free global interconnection Contention free switches, networks and global interconnection systems for routing messages from N input sources to M output destinations are disclosed.... | 08/25/1998 |
| 5500753 | Method and system for connecting an optical network unit with a plurality of user sites A method and system to connect an optical network unit with a plurality of user sites. The invention includes the steps of and circuitry for connecting a plurality of line circuits to a cross-connect matrix. The optical network unit contains both the line... | 03/19/1996 |
| 5457740 | Cross point mixer for a telephone set Disclosed is a cross point mixer including a cross point switch and a mixing circuit provided on the output side. The cross point switch includes n×m switches arranged in a matrix manner. Each of the switches corresponds to one of a plurality of n input ... | 10/10/1995 |
| 5425094 | Cross point switch with power failure mode A cross point switch mounted on a telephone-related device such as a telephone. When an alternate power source request signal is low, switches are controlled in response to external data. When the signal is high, a predetermined switch or switches are for... | 06/13/1995 |
| 5343193 | Matrix switcher apparatus This invention provides a matrix switcher apparatus adapted to arbitrarily distribute signals in a plurality of input channels to a plurality of output channels. The matrix switcher apparatus includes a cross point matrix adapted for connecting one matrix... | 08/30/1994 |
| 5319639 | Crossbar with return net for scalable self-routing non-blocking message switching and routing system A crossbar useful for self-routing messages is described having a return network that can return all messages, or their headers, that encounter a busy node at the output. A system is described in which this crossbar with return network can operate as a bu... | 06/07/1994 |
| 5072217 | One-sided crosspoint switch with distributed control In a one-sided crosspoint switch, multiple controllers are used instead of a single controller for control of the switching matrix. The controllers operate in parallel, thereby handling requests for connections and disconnections from ports at a higher sp... | 12/10/1991 |
| 4635250 | Full-duplex one-sided cross-point switch A full-duplex one-sided switching chip comprising externally connected lines as input/output pairs and pairs of bi-directional interconnection lines. Duplex cross-points selectively connect input/output line pairs to the interconnection line pairs. The in... | 01/06/1987 |
| 4482817 | Bilateral electronic switch A bilateral, low loss, wide band, switching circuit controls the transfer of a signal between two terminals. The balance points of a bilateral current gate connect to the terminals. A rectifier forward-biases the bilateral current gate when a controllable... | 11/13/1984 |
| 4360809 | Matrix switch and method of controlling cross point switch of a matrix switch The matrix switch comprises a plurality of input lines (Y1 -Y4), a plurality of output lines (Y1 -Y4) and a plurality of crosspoint switches for selectively connecting one or more input lines to one or more outp... | 11/23/1982 |
| 4353066 | Channel switching network A channel switching network, in which each cross-point of a switch matrix is constituted as a channel switch of balanced type using two PNPN semiconductor elements. Each of the two PNPN semiconductor elements is arranged in a forward direction with respec... | 10/05/1982 |
| 4266100 | Monolithically integrated semiconductor circuit A monolithically integrated semiconductor circuit, provided for coupling arrangements having symmetrical cross points, comprising two through switching NPN transistors, and a composite circuit for switching through the switching transistors. The composite... | 05/05/1981 |
| 4163159 | Attenuation-free electronic switch Electronic switch for use as a crosspoint in switching networks of space-division telephone exchanges where it is connected to function as an open circuit stable negative resistance provding ON-attenuation compensated signal transmission, the switch being... | 07/31/1979 |
| 4082923 | Semiconductor speech path switch A plurality of sets of thyristors, each set consisting of two thyristors connected in inverse parallel configuration, are arranged in the form of a matrix to provide a switch of balanced or unbalanced type. A control circuit is provided which feeds succes... | 04/04/1978 |
| 4053716 | Switching network with a crosstalk elimination capability A switching network having particular application in telephone exchanges is provided with crosstalk elimination capability. The crosstalk is effectively cancelled by generating signals which are reverse in phase to the crosstalk signals and adding these g... | 10/11/1977 |
| 4051391 | Current-operated circuits and structures Current-mode OR gates useful, for example, in telephone cross-point switch systems. A current-mode OR gate withdraws an output current of predetermined level at its output terminal whenever an input current of sufficient level is applied to one or more of... | 09/27/1977 |
| 4035773 | Control of leakage currents in a switching matrix A switching matrix arrangement using magnetic latching reed relays is disclosed, wherein similarly numbered switch groups and verticals are connected in common and are driven simultaneously with the exception of a grid select signal which is unique to a p... | 07/12/1977 |
| 4032892 | Semiconductor speech channel switch A semiconductor speech path switch selectively connects a transmitting circuit which is connected with a row line to one of a plurality of receiving circuits which are respectively connected with associated column lines, the row lines and column lines for... | 06/28/1977 |
| 4025726 | Cathode gate triggering method and system for speech path switches A cathode gate triggering method and system for speech path channel switches using m × n PNPN switches as switching elements, in which l × n PNPN switches in each switch array connected in common at the anode thereof are connected in multiple at the con... | 05/24/1977 |
| 4015190 | Controllable negative resistance electronic switch arrangement An electronic switch arrangement reverses damping of an electronic switching element by means of a controllable negative resistance. Adjustment of the negative resistance is provided by comparing a measuring current through the arrangement to a preselecte... | 03/29/1977 |
| 3993874 | Multi-stage switching networks for use in telecommunications exchanges A bi-directional switching network for a telecommunications exchange in the form of a matrix array of symmetrical switching devices each having many terminations at opposite sides. The switching devices of each row individually have their terminations at ... | 11/23/1976 |
| 3931475 | Electronic switches and switch networks In an electronic switching device for use as the switching component of a switching network in a telephone central office, the device being composed of a switching transistor connected in series in the signal conduction path for switched signals and a con... | 01/06/1976 |
