Token ring wiring concentrator
US5199026A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 27, 1991 |
| Grant date | Mar 30, 1993 |
| Priority date | — |
| Expiry date | Feb 27, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L12/42
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
In a token ring network wiring concentrator providing a low current/low voltage DC control signal to control insertion and removal of a work station, an improved concentrator lobe having a latching relay with a closed position in which communication is provided between a token ring network and a work station and an open position in which such communication is severed, an insertion relay driver circuit responsive to the DC control signal to close the latching relay when the DC control signal reaches a preselected minimum level, a removal relay driver circuit responsive to the DC control signal for opening the latching relay when the DC control signal falls below a preselected level and an insertion indicator LED for indicating when the work station is connected to the token ring network.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.