Automatic switching unit for data communications network
US4076961A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 9, 1976 |
| Grant date | Feb 28, 1978 |
| Priority date | — |
| Expiry date | Mar 9, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L1/22
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An automatic switching unit for connection to a modem at a remote site in a data communications network. The switching unit normally connects the modem to a primary data transmission path. If the primary path malfunctions, a central site operator can telephone the remote site and establish a secondary data transmission path. The switching unit answers the incoming calls and automatically disconnects the modem from the primary data transmission path. Once the primary data transmission path has been repaired, the central site operator causes the switching unit to return communications to the primary data transmission path. In one embodiment, this transfer can be made while maintaining communications over the secondary data transmission path.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.