Quotables
"The Americans have need of the telephone, but we do not. We have plenty of messenger boys."
Sir William Preece, chief engineer, British Post Office ; 1878
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| Number | Title | Issue Date |
| 4634812 | Method of transferring information between microcomputers in a decentralized process control system, particularly for telephone systems The invention relates to a method of transferring information between microcomputers in a decentralized process control system, particularly for telephone systems. To prevent contention for possession of the information transfer bus without the need for c... | 01/06/1987 |
| 4633039 | Master-slave microprocessor control circuit A control circuit, for use in a telephone switching system, which monitors, controls and transfers data to and from memory, input-output devices and external circuits. A pair of microprocessors and associated read-only and random-access memories are opera... | 12/30/1986 |
| 4614841 | Geographically distributed multiprocessor time-shared communication processing system A geographically distributed multiprocessor system is implemented by locating groups of processors at nodes which are interconnected by way of a transport network and which are connected by way of local lines to customer terminals and hosts. Each processo... | 09/30/1986 |
| 4604500 | Multiprocessing interrupt arrangement There is disclosed an interrupt arrangement for use in a multiprocessing system where it is desired to specifically direct interrupts from one processor to any other processor. The arrangement treats the interrupt signal as a data communication between pr... | 08/05/1986 |
| 4527012 | Communications switching system with modular switching communications peripheral and host computer A communications switching system is controlled as a peripheral device to a general purpose digital host computer or other host device. The switching system has a plurality of ports for telephone lines and/or trunks and makes connections to the ports. The... | 07/02/1985 |
| 4504942 | Line switch having distributed processing A line switch for a digital telephone switching system utilizes distributed processing. The line switch comprises one or more switch modules. Each switch module is coupled to a central office switching system via one or more PCM lines which utilize common... | 03/12/1985 |
| 4451702 | Arrangement of interactive telephone switching processors for performing timing analyses of port events A common control for a community office (C.O.) switching system includes two interactive processors. A call control processor comprises the uppermost element in the control hierarchy and is a stored program processor that controls call progression, marks ... | 05/29/1984 |
| 4443663 | Filtering of port data in a switching system employing interactive processors A central office telephone switching system including two interactive processors, including a call control processor that controls calls by establishing sequences of call progression states, and a port event processor that controls the ports and transmits... | 04/17/1984 |
| 4421955 | Distributed switching system A distributed switching system is disclosed which includes a plurality of simple-function switching units interconnected by speech path links, each unit having a speech-path switch, a plurality of processing units connected to speech-paths for use in sign... | 12/20/1983 |
| 4379950 | Distributed control memory network A computer-controlled distributed communication system in which there is a system controller and a plurality of group controllers all interchanging information over a system bus. Each group controller has its individual group bus for the exchange of infor... | 04/12/1983 |
| 4345326 | Switching network and telecommunications center comprising such a network When complete, the network D(p,k,a) comprises N operators each connected to p other operators of the network, p being an even integer. The N operators are located on h generatrices each comprising (P/2)k operators, h and k being any two numbers... | 08/17/1982 |
| 4317962 | Distributed control for digital switching system A uniformly manufacturable solid state modular distributed control for a digitally switched local or central office servicing an expandable number of subscribers is disclosed in which subscriber lines and trunks communicate through a standardized hardware... | 03/02/1982 |
| 4313036 | Distributed CBX system employing packet network A distributed CBX system which provides a virtual network between remotely located CBXs is disclosed. The CBXs are connected to both a voice network and a packet network. A first CBX may interrogate a second CBX to determine, by way of example, the status... | 01/26/1982 |
| 4307461 | Call processor for a satellite communications controller A call processor is disclosed for a satellite communications controller, having a plurality of M voice ports, with an E lead input and an M lead output connected to each of a first subplurality of voice ports for rotary dial telephones, a tone digit inter... | 12/22/1981 |
| 4293735 | Nodal structure switching network Switching network unit formed of a plurality of N identical elementary nodal switching networks having addresses from O to (N-1). If N is chosen smaller than or equal to fp, f and p being two predetermined integers, each elementary nodal switch... | 10/06/1981 |
| 4289934 | Integrated automatic call distribution facility and PBX system An automatic call distribution and voice line PBX switching system which includes a control complex having a first microprocessor based control circuit to selectively establish connections between access ports of a switching network. The control complex f... | 09/15/1981 |
| 4287567 | High speed central office scanner The invention relates to a high speed central office scanner for use with a plurality of transponding units connected by telephone lines. The scanner is comprised of N, I/O units, each comprised of a multiplexer for connecting the I/O units to M telephone... | 09/01/1981 |
| 4280217 | Time division switching system control arrangement A time division switching system having distributed control processors is disclosed. The distributed processors exchange control messages and cooperate in the completion of talking paths between subscribers. Each control message includes an address portio... | 07/21/1981 |
| 4276451 | Control system for telephone switching system A fault monitoring and diagnostic system for a telephony switching system. Two call processing systems connect through a programmable switch to port group units that receive individual telephone lines. All signals from the port group units are conveyed to... | 06/30/1981 |
| 4259549 | Dialed number to function translator for telecommunications switching system control complex A telecommunication switching system adapted to be connected to lines and trunks has a digital switching network and a control complex for executing system operational functions by program operated processors in response to dialed numbers received from st... | 03/31/1981 |
| 4256926 | Microprocessor control complex for a telecommunication switching system A microprocessor control complex for a telecommunications switching system disclosed in the context of a digital time division multiplex switching system. The control complex is arranged as a cluster of hardware identical microprocessors in a distributed ... | 03/17/1981 |
| 4213201 | Modular time division switching system The time-switch stages of a switching network are organized in identical multistage modules connected to peripheral modules by two-way time division digital multiplex links, and each containing a network message controller which connects to a central proc... | 07/15/1980 |
| 4210782 | Distributed control type telephone switching system A distributed telephone switching control circuit enables a plurality of separate switching networks to behave as if they were a single and integrated switching network. A data processor is individually associated with each separate network. Other data pr... | 07/01/1980 |
| 4201889 | Distributed control digital switching system A distributed control digital switching system is described in which a plurality of subscriber lines and trunks are provided with a switched access to various processing functions shared over a plurality of time shared multiplexed lines. Each processor of... | 05/06/1980 |
| 4201891 | Expandable digital switching network A distributed control digital switching network is configured as a group switch having a plurality of stages of multiport single sided switching elements for selectively interconnecting a plurality of input terminals via the transmission paths established... | 05/06/1980 |
| 4194090 | Decentralized-control type electronic switching system A decentralized control-type electronic switching system having at least one signal processor, at least one call processor and at least one switch processor is disclosed. The signal processor accommodates a plurality of communications lines for receiving,... | 03/18/1980 |
| 4178479 | Communication processor apparatus for use in a TDM switching system Communication processor apparatus for use in a TDM telephone system operating in a multiframe format consisting of a plurality of time frames where each time frame consists of a plurality of time slots having a time slot rate and where the plurality of fr... | 12/11/1979 |
| 4160130 | Essential user bypass circuit for telephone switching system An essential user bypass circuit for use in switch units of a telephone switching system. Telephone subscribers at each switch unit are able to communicate with each other and with subscribers at other switch units via associated subscriber apparatus and ... | 07/03/1979 |
| 4154988 | Method and means for accessing program memory of a common control telecommunications switching system A method and means for providing a remote data station with access to the program memory of a stored program common control telecommunications switching system. The control complex has an input/output port and a modem for interfacing that port with its sw... | 05/15/1979 |
| 4113988 | Speech path packaging unit including controller containing shift register A speech path apparatus in a space-division type electronic exchanger equipment wherein a plurality of switching networks each having controlled points and a plurality of trunks are divided into an appropriate number of packaging units, and a network cont... | 09/12/1978 |
| 4074072 | Multiprocessor control of a partitioned switching network by control communication through the network A centrally located stage of a time division multiplex switching network is partitioned into blocks and a separate processor is provided to control each such block. The partition is extended to the edge of the network by having each partition processor co... | 02/14/1978 |
| 4022982 | Apparatus for rearrangement of a switching network Apparatus establishes a connection between a certain network input or input channel and a certain network output or output channel by rearrangement of a three-stage switching network, where, in a specific network condition, each network input or input cha... | 05/10/1977 |
| 4009337 | Stored program control type electronic exchange system A small scale electronic telephone exchange system of stored program control type having a plurality of trunks and a central computer has been disclosed. The trunks function to process the real time operation and, therefore, the central computer does not ... | 02/22/1977 |
| 3974343 | Small modular communications switching system with distributed programmable control A telephone central office switching system with economical application to small community dial office sizes is disclosed. Communication paths are spatially switched over a modular network fabric comprised of electromechanically actuated metallic crosspoi... | 08/10/1976 |
| 3969701 | Function block oriented SPC system In a SPC (Stored Program Controlled) system including function blocks of the controlled system proper and function blocks of the controlling computer, an improved function block orientation is introduced by providing each function block with its own progr... | 07/13/1976 |
| 3963872 | Non-symmetric folded four-stage switching network A telephone central office switching system including a non-symmetric four stage (ABC+D) folded network and junctor circuits whereby a communication path is established from a calling terminal over the four stage network, through a junctor circuit, and ba... | 06/15/1976 |
| 3940568 | Circuit arrangement for telephone exchange installations with central control means and a plurality of individual apparatuses having a common information communication line connecting the individual apparatus to the central control means A circuit arrangement for long distance telephone communication installations having a central apparatus comprising a central control unit and individual apparatus of different types; for example, internal connection sets, long distance line repeaters, ex... | 02/24/1976 |
