Circuit arrangement for the switching on and off of a teleprinte

Details Circuit arrangement for the switching on and off of a teleprinte Circuit arrangement for the switching on and off of a teleprinte

1977-07-20

1978-10-17

Robinson, Thomas A.

Telegraphy

Systems

Automatic

H04L 1500

Patent

active

041210476

ABSTRACT:
A PBX exchange for teleprinters in which certain protected lines have the facility of direct connection to the main connection lines of the network, when the PBX exchange breaks down. Impermissible connections are avoided during the interruption and during the connection of the PBX exchange to the system by a circuit arrangement responsive to the respective switch on and switch off signals signalling corresponding operations of the exchange.

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