Did You Know...
...that it was melting ice cream that inspired the invention of the outboard motor? It was a lovely August day and Ole Evinrude was rowing his boat to his favorite island picnic spot. As he rowed, he watched his ice cream melt and wished he had a faster way to get to the island. At that moment the idea for the outboard motor was born!
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| Number | Title | Issue Date |
| 4490817 | Packet error rate measurements by distributed controllers A trunk controller and processor arrangement for monitoring the error rate occurring in packets received from a high speed trunk. Within a packet switching system, packets comprising logical addresses, and voice/data information are communicated through t... | 12/25/1984 |
| 4393490 | Digital telecommunications switches network with in-built fault identification In modern digital telecommunications switching networks the switch block may be a duplicated plane time-space-time arrangement in which each time switch stage and each space switch stage is controlled by control stores. Each control store is cross-office ... | 07/12/1983 |
| 4388715 | Alarm preprocessor logic An alarm preprocessing logic system for use in a computer controlled digital switching exchange including a central computer, the alarm preprocessing logic system comprising defence modules each allotted to a respective portion of the exchange for detecti... | 06/14/1983 |
| 4387456 | Alarm monitoring arrangements for digital telecommunications switching networks In digital telecommunication switching systems the switch block includes an alarm monitor unit (AMU) which is used for initiating maintenance related commands in addition to monitoring, persistance checking and filtering alarm outputs. It is particularly ... | 06/07/1983 |
| 4345324 | Process and system for error detection in a computer-controlled telephone exchange A method of supervising a plurality of data processing units in a redundant data processing system for controlling a telephone exchange having redundant digital switching networks, preferably of the TST type (Time-Space-Time), said processing units servin... | 08/17/1982 |
| 4300230 | Digital switching arrangements for stored program control telecommunications systems A digital switching arrangement for use in a telecommunications exchange handling channels of digital information in time division multiplex form. The digital switching arrangement being particularly suited for use in stored program processor controller e... | 11/10/1981 |
| 4224475 | Time division switching network A switching system for telephone exchanges employing pulse code modulation (PCM). The time division switching network uses standard circuits of a single type, i.e., symmetrical time division matrices (MTS) and, in a particular embodiment, one PCM telephon... | 09/23/1980 |
| 4218589 | Method and apparatus for testing tone generators Apparatus and methods for testing digital tone generators in a digital time division, multiplex telecommunications switching system. The tone generator produces both continuous and interrupted tones, and testing of any tone is accomplished by determining ... | 08/19/1980 |
| 4202025 | A circuit for protecting an electronic exchange against overloads The invention relates to methods for protecting exchanges against overloads. It comprises introducing into an exchange elements which detect increases in temperature and supply numerical signals. The central control unit of the exchange receives these sig... | 05/06/1980 |
| 4149038 | Method and apparatus for fault detection in PCM muliplexed system An idle channel test is provided for a digital time division multiplex and time switching network telecommunications system to detect and diagnose faults in an information path which routes digital information in dedicated channel time slots to and from a... | 04/10/1979 |
| 4081611 | Coupling network for time-division telecommunication system A coupling network at the junction of several multichannel TDM/PCM links comprises a pair of switching networks each including a set of input group units receiving incoming messages from respective PCM links, a set of output group units transmitting outgo... | 03/28/1978 |
| 4075440 | Automatic communication system reconfiguration apparatus A communication system is illustrated wherein the communication links include automatically reversible amplifiers with the termination means of two links closing a loop. Upon failure of detection of a carrier signal in one of the links at the terminating ... | 02/21/1978 |
| 4046964 | Testing of digital systems A digital subscriber loop transmission system is disclosed through which a number of remote subscribers are serviced with a smaller number of time division channels. The digital transmission system includes an automatic channel testing unit which selects ... | 09/06/1977 |
| 4045624 | Continuous monitoring in carrier telephone systems A continuous monitoring arrangement for a carrier telephone system utilizes the subscriber carrier at a reduced level when the subscriber set is on-hook. Proper reception of the reduced carrier level at the central office circuit during on-hook condition ... | 08/30/1977 |
| 4037054 | Circuit arrangement for monitoring PCM couplers In an exchange of a telecommunication network, which operates according to pulse code modulation (PCM) techniques, a circuit arrangement is described for monitoring the performance of a plurality of PCM couplers. The incoming and outgoing lines for the ex... | 07/19/1977 |
| 4022979 | Automatic in-service digital trunk checking circuit and method The integrity of switched, time-division multiplexed digital trunks in a telephone switching system is verified on an individual and in-service basis wherein the digital check is accomplished incident to the conventional D.C. network path continuity verif... | 05/10/1977 |
| 3967072 | Time division network connection auditing arrangement An electronic key telephone system is disclosed in which connections among the station sets and telephone lines are made in a central time division switching network remote from the station sets. Each station set and line is equipped with a port circuit h... | 06/29/1976 |
| 3937895 | Circuit arrangement for detecting double connections in digital telecommunication switching systems Apparatus is described for detecting undesirable duplications in connections in time division multiplex telecommunication systems, e.g., pulse code modulated telephone systems. The multiplex trunks are coupled through time coupling stages which may take t... | 02/10/1976 |
| 3937935 | Fault detection process and system for a time-division switching network A fault detection process and system is disclosed for large multistage time division-space division-time division switching networks. In the input time-division switch an origin bit is simultaneously transmitted with each sample to the related output chan... | 02/10/1976 |
