Compact telephone line test apparatus
US4920555A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 27, 1988 |
| Grant date | Apr 24, 1990 |
| Priority date | — |
| Expiry date | Sep 27, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M1/24
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A telephone line test apparatus is provided for determining the operational status of a telephone line. The apparatus has a cylindrical and compact housing structure, a light emitting diode, a resistor, an electrical interface, and an elongated cable with a terminal modular connector. The electrical interface is disposed within the housing structure and connects the light emitting diode and the resistor in series. The modular connector is communicatively connected to the electrical interface and flexible extends from the housing structure for easy and reliable use. The light emitting diode is a tri-state LED which indicates the presence of D.C. voltage and polarity, as well as A.C. voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.