Method and apparatus for signaling in a communication system
US4095045A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 19, 1977 |
| Grant date | Jun 13, 1978 |
| Priority date | — |
| Expiry date | Jan 19, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F13/38
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method and apparatus are disclosed for using a specified pattern of signal events for signaling in a digital communication system. Illustratively, detection of a first event in a control signal activates timing apparatus which looks for a second event in a control signal within a specified time "window" and at least one additional event in either a data or a control signal within a specified time period. Preferably, the first event is a drop in one of the carrier detect or request to send signals and the second event is a rise in the same signal. The additional event illustratively is reception of two identical data characters, each representing an address and an operation code. Each of these two characters must be received and compared for verification within the specified time period in order to produce an output control signal decoded from the operation code. This signal may be used for any application such as the activation of a terminal to receive data, the initiation of a test sequence, or a change of the network configuration.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.