Telephone circuit assembly
US5402484A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 29, 1992 |
| Grant date | Mar 28, 1995 |
| Priority date | — |
| Expiry date | May 29, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M19/026
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A circuit assembly which includes an interface circuit between a subscriber line and exchange devices of the kind with two amplifiers connected in a bridge configuration between the battery terminals and having a means of detecting the output currents; a supply circuit which includes the exchange battery and a ring generator; a switch-over means for putting the line through the interface circuit or the supply circuit; two bridge resistors which are in series with the line when the latter is connected to the supply circuit and of which one is connected permanently between one of the line terminals and the output of one of the amplifiers, which output is substantially at the potential of one of the battery poles; an additional resistor, having a much higher resistive value than that of the bridge resistors and being connected between the other of the line terminals and the output of the other of the amplifiers; and a processing means within the interface circuit, which includes said detecting means and is effective to isolate the useful signal from the line current, recognize a possible hook-off state, and send a corresponding signal to the exchange devices.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.