Method and apparatus for ensuring CRC error generation by a data communication station experiencing transmitter exceptions
US5195093A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 14, 1991 |
| Grant date | Mar 16, 1993 |
| Priority date | — |
| Expiry date | Feb 14, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F11/10
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method for ensuring CRC error generation by a data communication station after a transmitter exception such as an underrun whereby a parity bit is preset to a binary one, and toggled in response to successive binary ones of a serial bit stream. Each byte of the serial bit stream is transmitted sequentially. If a transmitter exception occurs, the byte before the exception is transmitted normally. However, only the first seven bits of the last byte are transmitted. The parity bit is sent as an eighth bit of the last byte, ensuring odd parity for the previous bit stream. Thereafter, a byte even parity is sent to assure that the overall message has odd parity. A receiving station interprets two consecutive bytes having the predetermined data pattern as the CRC, thus ensuring that the receiving station will reject the frame.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.