Patent ID: 7289435

Claim:
A method for manifesting alarms in a telecommunication network formed by interconnected network elements and operating according to digital transmission systems SDH/SONET, the method comprises arranging a combined alarm status byte called Data Quality Byte (DQB) of a data transmission stream, the DQB being formed in a predetermined byte associated with said stream's frame to bear indications of one or more alarm signals currently actual for said data transmission stream, the method further comprising performing the following steps at least at one network element of the telecommunication network: receiving from an upstream network element the Data Quality Byte (DQB 1 ) formed in said data transmission stream, forming, at said network element an updated Data Quality Byte (DQB 2 ) actual for the received data transmission stream, and comparing the DQB 1 received from the upstream network element with the updated DQB 2 formed at said network element to manifest an alarm status change ΔDQB.