Method for collecting information about physical constitution of lan system, method of specifying collision terminals, and method for detecting noise-generated position
US6122257A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Mar 12, 1997 |
| Grant date | Sep 19, 2000 |
| Priority date | — |
| Expiry date | Mar 12, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L41/12
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
In a bus type LAN, the data transmitted from a terminal (14) is detected by an adapter (1) connected to one end of a bus (3), and in response thereto the adapter (1) transmits a pulse signal onto the bus (3). An adapter (2) connected to the other end of the bus (3) receives the data transmitted from the terminal (14) and detects its source terminal address. A difference in time between the arrival of the data from the terminal (14) and the arrival of the pulse signal from the adapter (1) is measured by a counter circuit (21), and the count value obtained is stored in a memory (23), forming a pair with the corresponding source terminal address. Thus, the count value can be obtained for each terminal during the normal operation of the LAN. The data of the memory (23) are extracted by a personal computer (5), where the physical position of each terminal is calculated in accordance with the bus propagation velocity, and is displayed or printed out as a physical constitution diagram. Also, the packet signal, its collision signal, the jam signal and the pulse signal are utilized to measure the difference in time for the arrival of the pulse signal and so forth, to thereby specify the ter…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.