METHOD OF CONNECTING COMMUNICATION NETWORK, BASED ON SYNCHRONOUS DIGITAL HIERARCHY TRANSMISSION SYSTEM, TO HIGHER LEVEL CLOCK NETWORK SYNCHRONISATION NETWORK Russian patent published in 2011 - IPC H04L27/00 

FIELD: information technology.

SUBSTANCE: invention proposes not block transmission of synchronisation signals of unacceptable quality from a higher hierarchy level synchronisation network to a lower level communication network, i.e. limit the value the level of quality of synchronisation signal streams coming into STM-N at connection points, and also assign fixed quality levels to signals allowed for synchronisation.

EFFECT: warning on serious violations in the operation of a communication network and raising the quality of provided services by raising the quality of network synchronisation.

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