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| Patent ID | Title | Date Filed |
| 5901201 | Switch-based line continuity verification method and system
| May 14, 1997 |
| 5889835 | Method and system for testing a transmission line in a non-addressable network for continuity
| November 13, 1997 |
| 5862200 | Ground fault detector for T1 span equipment
| July 16, 1996 |
| 5848127 | Two-wire channel unit with loopback test capability
| April 19, 1996 |
| 5828978 | Line restoration detection for security systems
| February 23, 1996 |
| 5805571 | Dynamic communication line analyzer apparatus and method
| March 19, 1996 |
| 5802144 | Minimum common span network outage detection and isolation
| April 15, 1996 |
| 5771274 | Topology-based fault analysis in telecommunications networks
| June 21, 1996 |
| 5764725 | Apparatus for testing the line continuity of telephone switch equipment
| March 26, 1996 |
| 5737390 | Digital exchange system with function of displaying operation state of system
| September 13, 1994 |
| 5706280 | Transmission quality monitoring system for a digital communication network
| July 27, 1995 |
| 5627474 | Continuity checker for allocating individual cores of multi-core cables
| May 17, 1995 |
| 5606592 | Method and apparatus for analyzing resistive faults on telephones cables
| May 2, 1995 |
| 5566162 | Method of sectionalizing trouble on telecommunication network connections
| December 7, 1995 |
| 5521903 | Port system for interfacing digital PBX to digital transmission facility
| December 27, 1993 |
| 5436555 | LAN cable identifier for testing local area network cables
| June 9, 1994 |
| 5428471 | Fail-safe automatic shut-down apparatus and method for high output power optical communications system
| July 30, 1992 |
| 5426688 | Telecommunication alarm method and system
| May 12, 1993 |
| 5392327 | Termination unit with maintenance facility
| December 21, 1992 |
| 5353326 | Method for performing continuity check in an electronic exchange system
| April 20, 1992 |
| 5317278 | Switched active fault locate filter
| April 21, 1992 |
| 5296850 | Apparatus and proceses for mapping the connectivity of communications systems with multiple communications paths
| March 11, 1991 |
| 5270661 | Method of detecting a conductor anomaly by applying pulses along the conductor in opposite directions
| October 25, 1991 |
| 5260664 | Network monitor and test apparatus
| January 12, 1993 |
| 5222119 | Communication system and a method, to detect a power exposure of a communication line
| October 18, 1991 |
| 5144252 | Method and apparatus for transducer measurements on a metallic pair
| November 27, 1990 |
| 5128619 | System and method of determining cable characteristics
| September 5, 1991 |
| 5121420 | Automatic line defect detector
| September 17, 1990 |
| 5119031 | Method and apparatus for monitoring the integrity of a multiple-planes grounding system
| November 23, 1990 |
| 5115199 | Fault detecting system for duplexing type local area networks
| April 18, 1990 |
| 5113426 | Ground fault detector
| September 19, 1990 |
| 5083086 | Differential arc reflectometry
| July 12, 1990 |
| 5063563 | Communication terminal having means for controlling power transfer
| September 6, 1990 |
| 5060226 | Telecommunications network test system
| July 5, 1990 |
| 5047724 | Power cable arcing fault detection system
| December 19, 1989 |
| 5029274 | Apparatus and method for testing the integrity of wiring ensembles
| February 26, 1990 |
| 5027074 | Cable tester
| November 16, 1989 |
| 4992739 | Continuity tester
| July 13, 1989 |
| 4991105 | Microprocessor controlled ground system monitor
| December 21, 1988 |
| 4970466 | TDR cable testing apparatus with pulse timing manipulation to automatically compensate for diverse cable characteristics
| March 22, 1989 |
| 4953195 | Private branch exchange system with specific information transmitting function
| August 1, 1989 |
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