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"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 |
| 5442697 | Digital data loopback device The need to equip a digital data service termination with the ability to decode digital loopback commands is obviated by a relatively simple hardware modification of a four wire telephone circuit connecting an office channel unit and customer premises equ... | 08/15/1995 |
| 5408461 | Path route test apparatus for use in an ATM transmission system An ATM transmission system transmits cell-formatted data in an asynchronous transfer mode, and aims at conducting an online path route test in the system. If one path route only is established in the system, then one or more valid cell detecting units for... | 04/18/1995 |
| 5398233 | Method of resetting coupled modules and system using the method A method of resetting coupled modules and a system using the method are disclosed. The method comprises applying a reset instruction signal to a selected module, the selected module generating a reset permission request signal, one or more other modules (... | 03/14/1995 |
| 5390163 | Data exchange capable of minimizing loss of a data block In a data exchange for use in an asynchronous transfer mode communication system, the data exchange has first and second buffers. An input data block is selectively loaded with the first and the second buffers to be read as first and second output data bl... | 02/14/1995 |
| 5388091 | Communications system for communications between an electronic control apparatus and a test apparatus A communications system includes an electronic control apparatus having an asynchronous serial communications function and a test apparatus for checking the operation of the electronic control apparatus. The test apparatuses using different communications... | 02/07/1995 |
| 5384823 | Telecommunications switch with integral feature installation capability The operating system control device in a telecommunications switch is capable of operating under the control of software instructions associated with a new switch feature for executing a series of actions used to integrate the new switch feature with the ... | 01/24/1995 |
| 5383177 | Packet switching testing method and apparatus A packet section (21) generates each packet data by adding a packet header to each of a plurality of random patterns. A highway demultiplexing section (22) demultiplexes the generated packet data to a plurality of input highways. A packet multiplexing sec... | 01/17/1995 |
| 5373501 | Telecommunications switching network including improved port selector and control circuitry A telecommunications network testing and protocol analyzer arrangement including an improved control and port selecting circuitry which may be provided in the form of a board which plugs into a standard IBM or IBM compatible PC, XT, AT expansion bus (8 bi... | 12/13/1994 |
| 5361249 | Fault tolerant switched communication system A fault tolerant communication arrangement, for switching parallel N-bit information among a plurality of stations, includes an M-bit crossbar switch, where M is greater than N by a number S of supernumerary or spare bit paths. At each station, an interfa... | 11/01/1994 |
| 5351232 | Path monitoring system for cross-connect system In a cross-connect system, test pattern insertion circuits are connected respectively to input line circuits to receive a sequence of frames each containing an idle timeslot and a sequence of data timeslots. Each insertion circuit is enabled at multiple f... | 09/27/1994 |
| 5337306 | Digital tandem channel unit interface for telecommunications network A digital tandem channel unit installable in an intermediate central office of a digital carrier telephone network maintains the digital format of the T1 traffic in the course of a DS0 tandem cross-connect, so as to eliminates the possibility of corruptio... | 08/09/1994 |
| 5313453 | Apparatus for testing ATM channels A first form of an ATM channel testing apparatus tests an ATM channel by having a test cell detector in each switch to detect whether or not the switch appropriately switches a test cell generated by a test cell generating trunk. A second form of an ATM c... | 05/17/1994 |
| 5280469 | System for monitoring normality of operation of ATM cross-connecting apparatus A system for monitoring an ATM cross-connecting apparatus by rewriting a VPI conversion table to various values, inputting a test cell, and examining the test cell after the test cell passes through the ATM cross-connecting apparatus. Entries of a VPI con... | 01/18/1994 |
| 5268909 | Method for reducing bit errors in digital communication systems Method for reducing bit errors in digital communication systems. Bit falsifications can occur in the throughconnection of bit streams composed of a plurality of information words in the switching networks of digital communication systems. Correcting these... | 12/07/1993 |
| 5265089 | Loopback test circuit A digital multiplex communication system for carrying out digital multiplex communication between a plurality of terminal stations, at least two including one initiating party and the other party to communicate with, via a branching unit. In this system, ... | 11/23/1993 |
| 5257311 | System for monitoring ATM cross-connecting apparatus by inside-apparatus monitoring cell A system for monitoring an ATM cross-connecting apparatus by inputting a test cell through a path for a main signal into the ATM cross-connecting apparatus, and examining the cell after the cell passed through the ATM cross-connecting apparatus. An initia... | 10/26/1993 |
| 5253247 | Traffic control method and traffic control system for controlling cell traffic in an asynchronous transfer mode communication network A traffic control method for controlling the traffic characteristics of fixed-length information units and transmitting the information units through a number of divided systems in a ATM communication network comprises a step for monitoring the informatio... | 10/12/1993 |
| 5202882 | Method for checking transmission properties of a subscriber line circuit Given the prerequisite of a division of a subscriber line circuit into a high-voltage portion and a signal processor that defines the transmission-oriented properties, voltages arising at significant locations of the receiving branch and of the transmitti... | 04/13/1993 |
| 5195085 | Communication link identifier In a communications system having components which are interconnected via communications links, the system is provided with capability of responding to the application of a predetermined test signal to a link with information which identifies that link. S... | 03/16/1993 |
| 5167035 | Transferring messages between nodes in a network A message transfer arrangement includes a client node and a server node interconnected by a data link. The client node sequentially receives requests from user applications and generates, in response to each request, command messages for transmission by t... | 11/24/1992 |
| 5166925 | T carrier network test apparatus and method A customer service unit (CSU) with adjunct equipment is connected to the end of a T Carrier link at the trunk side of a CPE switch such as a PBX and includes one or more connections around the CPE switch to the line or station side. The adjunct includes a... | 11/24/1992 |
| 5121382 | Station-to-station full duplex communication in a communications network The present invention provides a method and apparatus for establishing point-to-point full duplex communication between two stations served by a local area network (LAN) or connected by a communication link. One station initially transmits a request messa... | 06/09/1992 |
| 5117417 | Circuit for checking the defined transmission bit rates A circuit arrangement for transmitting message cells during virtual connections that allows the checking of the transmission bit rate in an ATM switching system which includes a plurality of counter means corresponding in number to the number of virtual c... | 05/26/1992 |
| 5027343 | Remote test access system for ISDN testing Conformance with established standards and interoperability between products in an integrated services digital network (ISDN) system defined by a layered hierarchy of interrelated protocols is ascertained by remotely testing the protocols between a tester... | 06/25/1991 |
| 4887260 | X.25 Wide area network channel status display Provided is a channel status display for an X.25 wide area network (WAN) DTE-DCE interface. The invention, designed for use with a protocol analyzer, monitors X.25 level-2 frame traffic on the DTE-DCE link and produces a dynamic channel-activity-data-stru... | 12/12/1989 |
| 4870638 | Remote maintenance system for a digital communication network A remote maintenance system for a digital communication network, comprises local offices (LOs), at least two of which are grouped and connected to each other by a local line in the group, and a centralized maintenance and operation center (CMOC) located a... | 09/26/1989 |
| 4862454 | Switching method for multistage interconnection networks with hot spot traffic A method of switching data packets through a multistage interconnection network (MIN), to prevent hot spot traffic from degrading uniform traffic performance. Each of the address bits in each packet determine the output link at each particular stage of th... | 08/29/1989 |
| 4858224 | Diagnostic method of equipment and system using the same In a digital switching equipment or a digital cross-connect equipment including a plurality of receiving circuits, a multiplexer, a time division switch, a demultiplexer, and a plurality of transmitting circuits, each of the receiving circuits or the mult... | 08/15/1989 |
| 4858223 | Security arrangement for a telecommunications exchange system A security arrangement for a telecommunications system having two security planes, a plurality of peripherals, a plurality of peripheral communication controllers; and switching arrangements interconnecting the peripheral communication controllers. To det... | 08/15/1989 |
| 4829517 | Circuit arrangement for injecting meter pulses for subscriber tariff counting For subscriber termination circuits of a digital time multiplex telecommunications system comprised in a group, an injection circuit is provided, individual to a group. The injection circuit comprises a switch exhibiting a gradual change of state both in ... | 05/09/1989 |
| 4764918 | Telecommunication switching system An electronic switching network for use as a transit exchange, interconnects PCM digital trunks, and handles large numbers, e.g. 1,000 inlets and 1,000 outlets of such trunks. The switching network is fully electronic, using integrated circuit units. To p... | 08/16/1988 |
| 4757500 | Method for zero byte time slot interchange This method is a scheme for suppressing excessive amounts of logic zeros transmitted via T-carrier line facilities between switching systems or channel banks. This scheme provides proper zero bit suppression for alternating mark inversion signalling (AMI)... | 07/12/1988 |
| 4757501 | Method for zero byte time slot interchange This method is a scheme for suppressing excessive amounts of logic zeros transmitted via T-carrier line facilities between switching systems or channel banks. This scheme provides proper zero bit suppression for alternating mark inversion signalling (AMI)... | 07/12/1988 |
| 4730302 | Monitoring means for digital signal multiplex equipment In a switching location for TDM multiplexing of a combination of a plurality of channels for digital signals to form a common channel in one transmission direction and for demultiplexing a common transmission channel into a plurality of channels in the op... | 03/08/1988 |
| 4695997 | Device for performing wrap tests on a multiplex link in a data communication system In a data communication system, a device for performing a wrap test on at least one line without affecting the other lines that transmit and receive data over at least one multiplex link (4) within time slots allocated to a given line within a given frame... | 09/22/1987 |
| 4688208 | Time division exchange for carrying out a loop-back test A time division exchange interchanges predetermined time slots of a time division multiplexed signal and returns it to a network during a loop-back test. A buffer memory in a time division multiplexed trunk is used to interchange the predetermined time sl... | 08/18/1987 |
| 4653043 | Pre-cutover verification of switching system subscriber lines served via digital carrier facilities A test arrangement and method for use prior to the replacement of a first switching system serving a plurality of subscriber lines via a digital carrier facility and via a remote terminal, by a second switching system, where facility interface equipment o... | 03/24/1987 |
| 4641299 | Mechanized loop testing using a local metallic access port In a telephone local exchange system where loops are connected to a remote switch which in turn homes on a host switch via a carrier system and where the distance between the ends of the loops and the host switch exceeds a threshold, the loops may be test... | 02/03/1987 |
| 4621354 | DTMF receiver sense and control maintenance arrangement The DTMF receiver sense and control arrangement collects and stores multiple customer originated data for determination of customer identification, validity and billing purposes. This arrangement is part of a telecommunications switching office and monito... | 11/04/1986 |
| 4616359 | Adaptive preferential flow control for packet switching system Flow control of data packets through a packet switching network to reduce congestion is controlled by an adaptive preferential permit packet (APP) processing from an orginating data terminal through each packet switch node of the network to a destination ... | 10/07/1986 |
