Control circuit for half-duplex/simplex interface in communication system
US5212685A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 21, 1991 |
| Grant date | May 18, 1993 |
| Priority date | — |
| Expiry date | Mar 21, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L5/16
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An interface circuit for connecting an electrical half-duplex system to an optical simplex system includes logic which permits keep-alive signals to be gated onto the transmitting simplex fiber when data is not being received on the half-duplex conductor. The interface circuit includes receive logic connected in parallel with the receive data path. The receive logic responds to predetermined bit patterns in the received data to control the receive and transmit data path connections. The interface circuit also includes transmit logic connected in parallel with the transmit data path. The transmit logic responds to bit patterns in the data on the transmit data path to selectively gate the output of a keep-alive oscillator onto the transmit simplex fiber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.