Circuit arrangement for the routine testing of an interface between line terminator groups and the switching matrix network of a PCM telecommunication switching system

摘要

The interfaces between line terminator groups of a pair of redundant line terminator groups each comprise an interface circuit which makes it possible, by being equipped with a write-read memory, a switch- over device and a control device that controls these components, to test the interface parts belonging to an active line terminator group in a spot- check fashion during a time channel reserved for this purpose and to test the interface parts belonging to the passive line terminator group during all time channels on the basis of a respective check word mirroring.