Cordless modem system having multiple base and remote stations which are interusable and secure
US7142519B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 29, 2001 |
| Grant date | Nov 28, 2006 |
| Priority date | — |
| Expiry date | Sep 27, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W92/00
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A cordless modem system where a mobile station unit (MSU) is located in the computer and a base station unit (BSU) is connected to the telephone line. A radio frequency (RF) link is developed between the two units to allow a cordless connection. A series of commands are used between the two units to allow the MSU to request a channel, the BSU to grant a channel, the BSU to notify of a ring, and the MSU to request the BSU to go off hook. In addition, there is preferably a command sequence to allow authorization of a particular MSU or BSU. There are two full duplex channels in each MSU and BSU. This allows multiple BSUS and MSUS to be utilized in a small area. Communications between the two units are secure based on address values for each 15 unit contained in the various commands.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.