Did You Know...
...that after Parker Brothers executives turned down the game of Monopoly because it had "52 fundamental errors" (including taking too long to play), a copy of the game wound up in the home of the company president who stayed up until 1 a.m. to finish playing it? He was so impressed by the game that the next day he wrote to inventor Charles Darrow and offered to buy it!
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| Number | Title | Issue Date |
| 4583216 | Connection system for the supervision of telephone circuits Subject of the invention is a connection system suitable for supervision of large number of telephone circuits based on efficiency measurements. In addition to the holdings the talking state of the circuits is also determined and discounted from the line signa... | 04/15/1986 |
| 4569042 | Time measurements in a transmission path In a voice packet switching network (10), following call path set-up, continuity packets (500a-c) are transmitted between the call originating (100) and destination (101) nodes to check call path continuity. The continuity packets carry time stamps of the... | 02/04/1986 |
| 4552997 | Arrangement for loop analysis testing for a digital switching system The present invention is an interconnection of a loop analysis test system (LATS) to a digital switching system. This arrangement includes the utilization of existing network units to establish a path connection from the computer of a LATS system to a mea... | 11/12/1985 |
| 4551585 | Arrangement for facilitating external loop analysis testing for a digital switching system The present invention is an interconnection of a loop analysis test system (LATS) to a digital switching system. This arrangement includes the utilization of existing network units to establish a path connection from the computer of a LATS system to a mea... | 11/05/1985 |
| 4532624 | Parity checking arrangement for a remote switching unit network Circuitry for validating the integrity of PCM data transmitted through a digital switching network is shown. The space stage of the switching system requires that appropriate data validity be maintained throughout. A parity scheme is employed to fulfill t... | 07/30/1985 |
| 4466092 | Test data insertion arrangement for a conference circuit A time shared conference circuit for establishing conference calls in a T-S-T digital switching network provides for automatically inserting predefined test data into unused time slots of its output PCM voice data stream. The transmission of this predefin... | 08/14/1984 |
| 4402074 | Switching network test system A test system for a stored program controlled time-division switching network subdivided into subsystems. The test system includes circuits for selecting, injecting and retrieving data samples and testing for the correct setting of switchpaths through the... | 08/30/1983 |
| 4393491 | Automatic self-test system for a digital multiplexed telecommunication system An automatic self-test apparatus for use in a digital multiplexed communication system and self-testing idle circuitry coupled to idle telephone lines. The apparatus utilizes a tone generator which generates digital words describing an analog test signal ... | 07/12/1983 |
| 4340788 | Method of and system for measuring electrical characteristics of circuit elements included in time-sharing telecommunication network To measure electrical characteristics of a line segment, a switch or some other circuit element of a time-sharing telecommunication network using pulse-amplitude modulation, a transmission path is established between two subscriber lines through the circu... | 07/20/1982 |
| 4320497 | Method for testing communication paths A method for testing communication paths of an electronic exchange which has at least one pair of time-sharing communication highways and in which a plurality of port circuits are connected to one another in time-sharing fashion through the first and seco... | 03/16/1982 |
| 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 |
| 4296492 | Continuity verification arrangement A time division switching system having distributed control processors is disclosed. The switching system includes time-slot interchange units having associated subscriber sets and a time-shared space division network for interconnecting the time-slot int... | 10/20/1981 |
| 4270030 | Testing of subscriber loop pair gain systems A testing system is disclosed for telephone subscriber loops which are in part derived by multiplex facilities in what have come to be known as pair gain systems. In this testing arrangement, the local drop wires from the remote terminal of the pair gain ... | 05/26/1981 |
| 4251881 | Centralized automatic gain control circuit Disclosed is an automatic gain control circuit for a communications system, such as a time assignment speech interpolation system, which equalizes the loss in each of a plurality of transmission facilities by providing a symbol generator at a remote locat... | 02/17/1981 |
| 4156110 | Data verifier A data verifier for verifying the operation of a multiplexing system. The data verifier generates test information as an input to the multiplexing system. The multiplexing system processes the test information in the same manner as normal data. The data v... | 05/22/1979 |
| 4119803 | Control unit for a time-division telecommunications exchange In an existing time division exchange system the known switching network and connection units are retained, but the control of these units is taken over by a pair of new control units which replace a collection of previous units such as multi-registers, m... | 10/10/1978 |
| 4064369 | Method and apparatus for path testing in a time division multiplex switching network After marker functions have been performed to set up a network path during normal call processing, a continuity word is inserted into the path. The output of the path is coupled back to the input via a test multiplexer at the input to circulate the contin... | 12/20/1977 |
| 4060698 | Digital switching center A switching center having a plurality of sets of buffer stores for connecting the channels of a plurality of pulse code modulated signal systems to the inputs of a multiplexer in which there is provided a unit for generating a false busy signal to prevent... | 11/29/1977 |
| 4059736 | Dual testing system for supervising duplicated telecommunication equipment Two processors UP1 and UP2, designed to test the operation of a pair of switching networks IN1 and IN2 in a telecommunication system through respective sets of peripheral interface units P11 etc. and P21 etc., are interconnected for parallel operation and... | 11/22/1977 |
| 4048445 | Method for through connection check in digital data system A digital data switch of the time-space-time (TST) type for switching pulse code modulated (PCM) data is disclosed. The switch combines a parity bit with each PCM word being switched in a conventional way to supervise the internal operation of the switch.... | 09/13/1977 |
| 4024361 | Method of and means for identifying temporarily coacting units in a telecommunication system Selectively seizable operating units (e.g. switches, lines or coders), forming part of different groups A, B etc. of identical units, are monitored to detect any change of state in a unit of, say, group A followed within a predetermined test period by a c... | 05/17/1977 |
| 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 |
