Frequency Synchronization
Frequency synchronization is the ability to distribute precision frequency around the network. Precision frequency is required in the next generation networks for applications such as circuit emulation. To achieve compliance to ITU specifications for TDM, differential method circuit emulation must be used, which requires a known, common precision frequency reference at each end of the emulated circuit.
To maintain frequency synchronization links, a set of operations messages are required. These messages ensure a node is always deriving timing from the most reliable source, and transfers information about the quality of the timing source being used to clock the frequency synchronization link.