Fernueberwachungsanlage fuer ein PCM-UEbertragungssystem

摘要

To test several repeaters in a two-way transmission channel designed for pulse-code-modulation message signals, an identification code individual to a given repeater is sent out from a terminal station over one signal path and is picked up by a decoder at that repeater which, in response to several recurrences of the same code, closes a loop through the other signal path for feeding the code back to the originating station. The identification code is inserted four times in a binary sequency, sandwiched between guard codes of first-order and second-order periodicity to limit the possibility of accidental formation within the sequence of a code assigned to a different repeater.