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| Number | Title | Issue Date |
| 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 |
| 4303808 | Locating noise in communications systems An impulse noise source in a bidirectional submerged communications system is positionally located by detection apparatus at one end of the system which measures the time interval between the same impulse arriving twice at the one end of the system, first... | 12/01/1981 |
| 4302836 | Monitoring circuit for time-division switching network A circuit for monitoring the operation of a time-division switching network, in particular, a circuit for checking the continuity of the switching network speech paths during actual communications. The circuit includes a plurality of monitoring Groups (I, II .... | 11/24/1981 |
| 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 |
| 4266293 | Protection control unit for a TDM system A digital multiplexing system including first and second multiplexers, each connected to a plurality of multi-timeslot digital data buses for multiplexing digital data on said plurality of buses to first and second buses, respectively, thereby forming fir... | 05/05/1981 |
| 4254495 | Control system including built in test equipment for wiring harness interface testing A control system features built in test equipment for wiring harness interface testing, i.e., testing critical wires leading to the system from external signal sources, for reducing maintenance costs and for insuring critical wire validity of line replace... | 03/03/1981 |
| 4209666 | Multiplexing system line fault isolation and identification In a multiplex signalling system for two-way data transmission over a single transmission line, the line is configured as a loop terminating at each end at a central or control station, thereby furnishing two communication paths between the central statio... | 06/24/1980 |
| 4195206 | Path test apparatus and method Path test apparatus and a method for verifying the continuity of a data path in a telephone system between an input portion and an output portion of a telephone interface which receives and transmits telephone signals where the telephone system operates i... | 03/25/1980 |
| 4170722 | Apparatus and method for remote testing of a loop transmission path A first network can be switched into and out of connection with a lowpass filter disposed at one of the two opposite carrier terminal ends of a loop transmission path employing a double-sideband carrier. When the filter and network are so connected, an os... | 10/09/1979 |
| 4156106 | Multiplex-data bus modulator/demodulator Improved modem terminals spaced along a high-frequency triaxial data line a long length. Each modem employs signal delay and differential detection circuitry to detect signals on the line which may have been degraded in transmission. Conversion circuitry... | 05/22/1979 |
| 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 |
| 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 |
| 4071704 | Service generator checking apparatus Service generator checking apparatus and a method in a telephone system operating in time frames each consisting of time slots. The apparatus sends a tone sample signal in one frame through a system interface having an input portion and an output portion,... | 01/31/1978 |
| 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 |
| 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 |
| 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 |
| 4029913 | Remote accessing system for telephone lines A system for electronically selecting and establishing test loop circuits between a remote test position and any of a large number of communication lines at an access location. Extensive logic circuits at the access end and the test end exchange informati... | 06/14/1977 |
| 4015206 | Protective relaying modem receiver A receiver is provided for utilization in a protective relaying modem to effectively distinguish between two mutually exclusive signal frequencies in a given frequency channel and which are respectively indicative of a "fault" or "no-fault" condition in a... | 03/29/1977 |
| 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 |
