Telephone instrument connection block with remotely actuated line test
US4169220A · kind A · utility
Inventor
Key dates
| Filing date | Oct 2, 1978 |
| Grant date | Sep 25, 1979 |
| Priority date | — |
| Expiry date | Oct 2, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M3/301
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A remotely actuated line testing connection block with modular jack is disclosed for installation and use to connect directly to a subscriber's telephone instrument. The block is connected to the incoming tip and ring wires of the line and to ground and provides tests which closely emulate those performed by a field repairman. When a test voltage of a first polarity from a central office is applied across one of the tip and ring wires and ground, a capacitor is charged. Upon release of the test voltage, the capacitor actuates a first switch which shorts the tip and ring wires together and may also ground them if a ground test option is selected. The capacitor also activates a second switch which disconnects the user's instrument. The first switch releases after about half of a test interval with the second switch releasing at the end thereof to restore normal line connections. In addition to, or in lieu of the first and second switches, the test block may include a test signal generator driven by a second capacitor charged from a test voltage of reversed polarity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.