Polling-type digital communications system having pseudo-balanced mode
US5469436A · kind A · utility
Inventors
Key dates
| Filing date | Sep 24, 1992 |
| Grant date | Nov 21, 1995 |
| Priority date | — |
| Expiry date | Sep 24, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L12/403
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A large communications network is linked to a primary terminal and a secondary terminal. The primary polls the secondary whenever it has data to send, and need not poll at any maximum fixed interval. The poll operation sends a sequence of data frames to the secondary, and causes the secondary to return to the primary a sequence of frames containing any data it may have ready. The secondary can only send data to the primary in response to a poll operation; however, the secondary has the capability of sending a uniquely identifiable frame on its own initiative whenever it has data ready to send and has not received a poll. This frame causes the primary to initiate a normal poll even though it has no data ready to send.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.