Protocol and apparatus for selectively scanning a plurality of lines connected to a communication device
US5023867A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 19, 1989 |
| Grant date | Jun 11, 1991 |
| Priority date | — |
| Expiry date | Jan 19, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L61/5038
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A scanning protocol is provided for the scanning of a plurality of serial transmission lines connecting users' devices to the scanning means of a communication device, said lines being coupled to the scanning means through line interface couplers (LICs) having each a wired address (n,n', . . . ) known to the scanning means. This scanning protocol requires that for each LIC configuration, a given LICn having a wired address n be re-addressable with a logical address n' corresponding to the wired address of any other active LICn'. This is done in order to determine, for said LIC configuration, the shortest possible scanning scheme including all the active LICs. The re-addressing of a LICn of wired address n, with a logical address n', includes the steps of: resetting the LICn to be affected a logical address n'; setting the logical address n' into LICn; locking said logical address n' into said LICn, and enabling the lines (26) connected to LICn re-addressed with logical address n'.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.