Automatic switching unit for data communications network

Details Automatic switching unit for data communications network Automatic switching unit for data communications network

1976-03-09

1978-02-28

Stellar, George G.

Wave transmission lines and networks

Automatically controlled systems

With control of equalizer and/or delay network

333 3, 340147SC, H04M 900, H04M 1100, H04B 300

Patent

active

040769615

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.

REFERENCES:
patent: 3527891 (1970-09-01), Johnson
patent: 3718781 (1973-02-01), Angner et al.
patent: 3879579 (1975-04-01), Fretwell
patent: 3899641 (1975-08-01), Etra

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