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US 4,048,445 AGranted
Method for through connection check in digital data system
AssigneeL.M. Ericsson Pty. Ltd.
InventorWalter Ghisler
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AssigneeL.M. Ericsson Pty. Ltd.
InventorWalter Ghisler
Estimating the term…
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.
A method of checking for the correct connection establishment between a desired input and a desired output of a digital data switch of the kind utilized for switching data having a parity bit, the method comprised in the steps of:
A method of checking the correct connection establishment between desired input and output points in a digital data system including one or more switches between said points, said switches being under common control and wherein said data is transmitted with a parity bit, the method comprising the steps of:
In a digital data switch having a parity bit generator at its input and a parity bit detecting means at its output and control means for connecting one of a plurality of input lines to a desired one of a plurality of output lines, a method of detecting the establishment of a correct connection between said input and said desired output comprising the steps of:
In a digital data switch adapted for switching PCM data in a telephone network, said switch being of the time-space-time type and having a parity bit generator at its input and a parity bit detecting means at its output and control means for connecting one of a plurality of input lines to a desired one of a plurality of output lines, a method of detecting the establishment of a correct connection between said input and said output comprising the steps of:
Dependencies are inferred from the claim text.