Detection and compensation of ingressing frame offset discontinuities for tandemconnection trails

摘要

The invention relates to the detection and compensation of frame offset discontinuities for tandem connection trails in general and especially to frame offset discontinuities occurring at the entrance of a network element in a Synchronous Digital Hierarchy (SDH) and Synchronous Optical Network (SONET) system. It is an object of the invention therefore, to reduce the influence of frame offset discontinuities occurring at the beginning of a Tandem Connection Trail in a Synchronous Digital Hierarchy (SDH) or in a Synchronous Optical Network (SONET) System. This problem is solved by a method of transmitting data in a synchronous hierarchic network system comprising at least a path segment between a first network element (A) and at least a second network element (B) on which tandem connection monitoring (TC) method is established for monitoring transmission of information over said path segment. The method is characterised by detection of frame offset discontinuities at said first network element (A) on the basis of the detection of an alteration of the pointer value.