Ground fault detector for T1 span equipment
US5862200A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 16, 1996 |
| Grant date | Jan 19, 1999 |
| Priority date | — |
| Expiry date | Jul 16, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B5/263
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A ground fault detector for TI span equipment for transmitting signals from a central office to a network interface unit and receiving signals at the central office from the network interface unit. The TI span equipment includes a first pair of cables for transmitting data payload from the central office to the network interface unit and a second pair of cables for receiving data payload at the central office from the network interface unit. A line repeater is located along the TI span equipment between the central office and the network interface unit. The line repeater includes a transformer with core and a first, second, third and fourth coil. The coils are coupled to the transmit and receive span, and the transformer core saturates when the current differential between the coils exceeds a predetermined level. When the core is saturated, signals present on the first coil are not imposed on the second coil. A detector device senses the absence of a signal on the second coil determines that there is a ground fault.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.