Did You Know...
...that Charles Goodyear performed some of his experiments on rubber while in debtor's prison? He was there so often he referred to it as his "hotel". Chronically in debt because of poor business sense and ill health, Goodyear depended on the generosity of friends and family. Even after he unlocked the secret to vulcanizing rubber, he was unable to improve his financial situation. When he died, his estate was $200,000 in debt.
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| Number | Title | Issue Date |
| 5537392 | Procedure and device for routing telecommunications in a meshed network In a meshed network, telecommunication calls from a transmitting-end telecommunication terminal (A) are routed via an originating node (ON), via transit nodes (TN1, . . . , TN7) and a destination node (DN) to a receiving-end telecommunication terminal (B)... | 07/16/1996 |
| 5535326 | System and method for logical console verification and feedback A system and method for logical console verification and fallback. Conformity of physical equipment configurations with the logical console control and fallback plan is verified by sending messages through the backup paths and testing message response. Th... | 07/09/1996 |
| 5528679 | Automatic detection of digital call paths in a telephone system A method and apparatus for determining whether a sufficiently clear digital path exists from a first end user to a second end user when connecting a call over a switched telephone network. Once the determination is made, the type of connection that is pos... | 06/18/1996 |
| 5521902 | Location identification in a communications signalling network A monitor probe for a communications signalling network, such as an SS7 network, is arranged to determine its own location on the signalling network by watching for a particular type of message which carries the required information in its routing label. ... | 05/28/1996 |
| 5521903 | Port system for interfacing digital PBX to digital transmission facility A port system interfaces digital PBX's to any transmission facility having DSX-1 communications ports via a microprocessor controlled PBX port board connected between PBX switch fabric and a first DSX-1 communications port. A channel service unit (CSU) mo... | 05/28/1996 |
| 5515360 | Method for monitoring the through-connect paths for information transmitted in the form of data bytes in digital time-division multiplex switching equipment In a method for monitoring the through-connect paths in digital switching equipment, the data bytes to be through-connected are divided into at least two halves and are through-connected via parts of the through-connect means of the switching equipment th... | 05/07/1996 |
| 5509029 | Serial data transmissions device and terminal unit for the same A serial data transmission device has a master unit, plural terminal units, and an abnormal detection unit connected by a signal line. Each terminal unit has an allocated address. The master unit interchanges data with each one of the plural terminal unit... | 04/16/1996 |
| 5495470 | Alarm correlation system for a telephone network A DS3 level access, monitor and test system for a telephone network. The system provides selective, and hitless, bit overwrite in any of the embedded DS1, DS0 and subrate channels in a DS3 signal. Multiple DS0 and subrate channels can be tested via the as... | 02/27/1996 |
| 5487073 | Test system for a very high-speed ring network and an operating procedure for the system A test system for a very high-speed ring network and an operating procedure for the system is provided that can be used with a communications coupler in which function tests are implemented and wherein a processor executes specific test software. The test... | 01/23/1996 |
| 5483467 | Patching panel scanner A local area network including cabling interconnecting a plurality of workstations, the cabling including a plurality of data ports and conductors for selectable and removable interconnection between selected ones of the data ports and apparatus for autom... | 01/09/1996 |
| 5479473 | Method and apparatus for testing call paths over long distance carrier networks A remote test site is connected to a maintenance port of a long distance carrier switch. The remote test site is capable of placing calls through the maintenance port of the long distance carrier switch, testing from the switch forward to the called party... | 12/26/1995 |
| 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 |
| 5440565 | Test method and apparatus capable of testing reception of a desired cell through a virtual path In a test method and apparatus for testing a virtual path in an asynchronous transfer mode system, a sequence number is included in an operation administrating monitoring (OAM) cell to specify the OAM cell for testing a virtual path between transmission a... | 08/08/1995 |
| 5432775 | Auto negotiation system for a communications network A system provides for detection of enhanced capabilities of stations on a communications network. A specified pattern of link test pulses are detected and transmitted to provide for the indication of enhanced capabilities. This is particularly useful for ... | 07/11/1995 |
| 5426688 | Telecommunication alarm method and system A Public Switched Telecommunications Network (PSTN) including trunks connecting SPC switches and having a common channel signalling network with SPs, STPs, and SCPs, with each of the SPs connected to an MCC which is connected to an MMOC forming part of an... | 06/20/1995 |
| 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 |
| 5406563 | Method for error detection in digital communication systems Bit falsifications in the form of wrong through-connections of bit streams composed of a plurality of information words occur in the switching networks of digital communication systems. In order to discover and eliminate these wrong through-connections, c... | 04/11/1995 |
| 5400321 | Central monitoring system of a multiplex subscriber loop carrier A central monitoring system of a multiplex subscriber loop carrier has a remote terminal which includes a first subscriber line tester for testing first subscriber lines connected to subscriber terminals so as to detect a fault on a first subscriber line ... | 03/21/1995 |
| 5394408 | Policing control apparatus A policing control apparatus having a cell input terminal receiving asynchronous transmission communication network cells; a policing circuit coupled to the input terminal for policing transmission of cells according to policing information; a cell output... | 02/28/1995 |
| 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 |
| 5373504 | Apparatus and a method for setting a communication path An apparatus for setting a communication path in ATM communication, comprises: communication path control unit for indicating a communication path test before starting communication; test cell assembling unit for assembling test cells that consist of a se... | 12/13/1994 |
| 5369634 | Transmission quality assessment arrangement Transmission quality assessment arrangement for a communication switching system wherein a stream of cells of information is transmitted from an input (I) to an output (O) over a same communication path. It is adapted, at the input, to insert in the cell ... | 11/29/1994 |
| 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 |
| 5353326 | Method for performing continuity check in an electronic exchange system A method of performing a continuity check on a speech channel in an electronic exchange system includes indicating and transmitting a continuity check request on a continuity check indicator located in a head address message if characteristics of a trunk ... | 10/04/1994 |
| 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 |
| 5349341 | Quad channel unit health registers with "OR" function means Disclosed is a circuit for channel units in a digital loop carrier transmission system. Two registers include information related to the health of the channel units. One of the bits of a first register is the logical "OR" of the last four bits in the seco... | 09/20/1994 |
| 5337307 | Method of tracing virtual path operation information and apparatus applied thereto Virtual path operation information of each of the stations of an synchronous transfer mode telecommunications network is traced using OAM cells. OAM cells used for operation and maintenance control of the asynchronous transfer mode telecommunication netwo... | 08/09/1994 |
| 5331628 | Path testing and/or monitoring within a multiple node telecommunication system A multiple node telecommunication system path identification technique enabling expedited path testing and/or monitoring, and providing rapid confirmation upon completion of a successful testing and/or monitoring function. The technique eliminates erroneo... | 07/19/1994 |
| 5321688 | Method and apparatus for transmission of failure information of virtual path in ATM network A method for transmitting virtual path failure information in an asynchronous transfer mode network the method includes performing search against a table storing virtual paths being used for generating failure indicative cells for respective ones of the v... | 06/14/1994 |
| 5321689 | Multipath transmission system A multipath transmission system of this invention includes a plurality of multiplex nodes connected in parallel to three common signal transmission lines. The multiplex node includes a transmission control circuit which is allotted to a corresponding one ... | 06/14/1994 |
| 5319632 | Transmission network in which a communication path is automatically restored in accordance with occurrence of a failure in a distributed way For enabling automatic restoration of a path in a transmission network including a plurality of crossconnect systems and a plurality of communication routes, a unit specifying circuit specifies, as a first and a second specified unit, two of the crossconn... | 06/07/1994 |
| 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 |
| 5296850 | Apparatus and proceses for mapping the connectivity of communications systems with multiple communications paths An apparatus and method, using a computer, for the efficient generation of a wiring map of the connectivity between two sets of terminals at different locations which have established communication links between respective terminals at the two locations. ... | 03/22/1994 |
| 5296956 | Performance monitoring and fault location for optical equipment, systems and networks A performance monitoring technique which allows faults within an optical communication system to be detected and located. More specifically, a technique employing a signal generator to controllably insert maintenance signals at the input and output of eac... | 03/22/1994 |
| 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 |
| 5267231 | Digital communication channel interface A differential protective relay system includes protective relays 19A and 19B at the terminals of a protected transmission line segment 21. Analog signals QL1 and QL2 are sampled at the respective ends of the protected line segment 21, digitally encoded u... | 11/30/1993 |
| 5267300 | High speed digital data transmission over switched voice network A dialed telephone connection can be implemented as an end-to-end digital connection by virtue of switched voice transmission facilities becoming more prevalent. If such a connection is detected, it is possible to transmit digital data over the connection... | 11/30/1993 |
| 5198805 | Method and apparatus for monitoring a network and locating a node using signal strength calculations Disclosed is a system that monitors the signal strength of each transmission by a node on a LAN cable of a local area network and determines the location of the node sending the signal. This system has a monitor at each end of the LAN cable, with one of t... | 03/30/1993 |
| 5189410 | Digital cross connect system A digital cross connect system includes reception interface parts for converting an input line signal into a VT signal having a VT frame format in conformance with synchronous optical network (SONET) standards, a switching part for cross connecting the VT... | 02/23/1993 |
| 5189665 | Programmable configurable digital crossbar switch A digital crossbar switch designed to facilitate easy and flexible interconnection of up to 8 data ports. The device includes 8 bidirectional ports, each 8 bit wide. Interconnection of the ports is controlled by 32 stored control memory locations associat... | 02/23/1993 |
