Protected information transfer system

Details Protected information transfer system Protected information transfer system

1989-04-21

1990-08-14

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 851, H04J 308

Patent

active

049493345

ABSTRACT:
An add/drop interface is connected in series with a data bus and is constructed for receiving an add/drop module. The add/drop interface includes a data selection multiplexer which receives through data from the data bus and add/drop from the module and selects the proper output data in response to a signal received from a controller in said interface. The controller provides a signal to drive the data selection multiplexer to select the add/drop data only after all transient signals resulting from module connection have dissipated. The controller also provides error checking so that the through data is selected if errors are detected. Timing circuitry in the interface maintains the correct phase relationship between through data and add/drop data.

REFERENCES:
patent: 4393492 (1983-07-01), Bishop
patent: 4468767 (1984-08-01), Warren et al.
patent: 4514841 (1985-04-01), Sem-Sandberg

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