Data access arrangement having combined remote hang-up/ring detection circuitry
US6141414A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 8, 1998 |
| Grant date | Oct 31, 2000 |
| Priority date | — |
| Expiry date | May 8, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M11/06
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A data access arrangement (DAA) for interfacing a modem with a telephone line which requires only one safety barrier device for providing electrical isolation of the modem from the telephone line for both a ring detection signal and a remote device hang-up detection signal transmitted from the DAA to the modem. The DAA utilizes the same combined circuitry to transmit both the ring detection signal and the hang-up detection signal to the modem. The single safety barrier device is selectively connected to either ring detection circuitry during an On-Hook mode or remote hang-up detection circuitry during an Off-Hook mode by a selectively operating a relay switching device. With this arrangement, an improved DAA is provided having a combined circuit configuration for communicating ring detection information to the modem during the On-Hook phase and communicating remote hang-up detection information to the modem during an Off Hook phase, thus minimizing the size, cost, and complexity of the DAA.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.