Intelligence transmission system of the local area network type
US4713807A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 22, 1986 |
| Grant date | Dec 15, 1987 |
| Priority date | — |
| Expiry date | May 22, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2012/6486
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A system of the local area network (LAN) type using a closed loop optical fibre transmission medium, in which a series of stations, one of which acts as a master station, are connected to the loop. In each TDM cycle, a group of adjacent time slots is used as a framing group which occurs once per cycle of the system, the framing group including a multi-bit group number position which identifies a slot or group of slots. The loop includes a latency buffer to set the loop delay time to exactly 125 micro seconds, and the system according to the invention provides for both circuit-switched and packet-switched connections. To set up a circuit-switched connection, a free slot is chosen and its identity signaled in a packet manner. The proportion of slots allocated to circuit connections is varied dynamically, with indication thereof conveyed in a framing group of slots which occurs once in a cycle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.