Clock Source Priority

This function is used to configure the priority level of an equipment-traced clock. The equipment always traces an available clock source currently with the highest priority. In normal status or switching status, the equipment selects the clock source according to the clock source priority list. Available clock sources of the equipment are arranged in the list according to their priority levels from the top down.

• Clock Source Priority
  In this user interface, you can query and set the priority list of clock sources, select the external clock source mode, and select the tributary board for tributary clock source.
• Priority for PLL Clock Sources of 1st External Output
  When you need to use the line clock source of the equipment as the phase-locked source, you must configure the priority table for phase-locked sources in this user interface. Usually, the equipment uses internal clock sources as phase-locked sources. In this user interface, you can also query and set priority table for phase-locked sources of first external output clocks and adjust the priority of each clock source. The available clock source with the highest priority can be used as the phase-locked source to lock the phase of first external output clock. An internal source can be assigned with the lowest priority level only.
• Priority for PLL Clock Sources of 2nd External Output
  When you need to use the line clock source of the equipment as the phase-locked source, you must configure the priority table for phase-locked sources in this user interface. You can also query and set priority table for phase-locked sources of second external output clocks and adjust the priority of each clock source. The available clock source with the highest priority can be used as the phase-locked source to lock the phase of second external output clock. An internal source can be assigned with the lowest priority level only.