Coin telephone station simulator and condition indicator
US4022987A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 30, 1976 |
| Grant date | May 10, 1977 |
| Priority date | — |
| Expiry date | Mar 30, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M3/248
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A coin telephone station simulator and condition indicator. Separate tip, ring, and ground input/output conditioners are provided for connection to a telephone system for test. A controllable coin present relay simulator circuit is switchable from a first high impedance condition to a second lower impedance condition in between tip and ground conductors. A coin test switch switches the controllable relay simulator circuit from the first to the second condition. A coin present indicator is provided together with means for energizing the coin present indicator when the simulator circuit is in the second lower impedance condition. Coin collect and coin return indicators are provided. A coin collect and return detection circuit is responsive to first and second electrical signals, of opposite polarity, momentarily and separately applied in between the tip and ground conductors for individually energizing, respectively, the coin collect and coin return indicators. Low, acceptable and high voltage indicators are provided. A line voltage detector circuit is responsive to an electrical signal applied between the tip and ring conductors of below a first voltage level for enabling the low in…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.