Bi-directional signaling apparatus
US3999013A · kind A · utility
4Cited by
3References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 23, 1976 |
| Grant date | Dec 21, 1976 |
| Priority date | — |
| Expiry date | Feb 23, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04Q1/38
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A solid-state sensor for use in the front end of a DX (Duplex) signaling unit to monitor signals on A and M leads and output signals on an E lead for transmission to a single frequency signaling unit (SFSU) or other E&M signal devices. This circuit replaces a polarized, bridge configured relay normally used for this application in communication circuits.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.