METHOD AND APPARATUS FOR QUALITY MONITORING OF AT LEAST TWO TRANSMISSION SECTIONS OF A DIGITAL SIGNAL TRANSMISSION LINK

摘要

Method for quality monitoring of at least two series connected transmission sections in a digital signal transmission link for digital equipment conforming to the synchronous digital hierarchy. Error message bytes in which parity errors are accumulated are transmitted in the section overhead of synchronous transport modules as special bytes for the accumulation of parity errors in successive transmission sections. A quality criterion for the monitored transmission link is acquired from a sequence of error message bytes. The method and the apparatus can be advantageously used in transmission equipment of digital synchronous hierarchy.