Three relay C. O. trunk interface
US4689816A · kind A · utility
5Cited by
7References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 15, 1985 |
| Grant date | Aug 25, 1987 |
| Priority date | — |
| Expiry date | Jan 15, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M7/0096
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An interface system having a single detector to detect incoming signalling including ringing, tip ground, forward loop current, and reverse loop current. Relays and bias control are utilized to perform outgoing signalling and for configuring the system to defect the various incoming signalling states with a single detector.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.