Method for forming a standby or spare path in a network e.g. for WDM transmission system, requires selecting spare or standby path when spurious message or signal is received

摘要

A method for forming a spare or standby path in a network for signal transmission from a source node (X) to an end node (Y) which are connected to a number of network nodes (Ni) with intermediate connecting sections (Li) (i = 1,2...). A spurious message or signal is transmitted from one of the network nodes ahead of the defects (UL) up to the source node (X), and with receipt of the spurious message or signal a spare or standby path is selected for bypassing the signal around the defect (UL). To establish the second resource of the network for the circuit of the connecting section of the standby or spare path only the connecting sections (L1ul, L2ul) are newly connected into circuit by means of the network nodes assigned to the bypass, and the circuit of the connecting sections common to both paths is retained.