Title: Method for through connection check in digital data system

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Abstract: A digital data switch of the time-space-time (TST) type for switching pulse code modulated (PCM) data is disclosed. The switch combines a parity bit with each PCM word being switched in a conventional way to supervise the internal operation of the switch. The invention consists of a method of using such a switch for checking that a correct or intended connection is made through the switch by inserting incorrect parity with PCM words to the input in question immediately after the connection is established and checking the outlets of the switch to determine the output/s having incorrect parity. The check is made by the central control of the switch which compares the output/s having incorrect parity with the intended output/s. A simple circuit arrangement for distinguishing deliberately introduced wrong parity from through connection faults is also disclosed.


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