BMC (External Time Interface)

In this user interface, when the NE is connected to an external clock source, you can set the BMC algorithm that the external clock source uses through the external interface, so that the system can calculate and select the best clock source according to the set attributes, such as precision and priority.

Background Information

The best master clock (BMC) algorithm can determine the GMC in any network structure and build the master-slave hierarchy. In addition, the BMC algorithm transfers the master clock and reference time to each node level by level, to realize the optimum clock precision.

Navigation Path

In the NE Explorer, select an NE and then choose Configuration > Clock > PTP Clock > External Time Interface from the Function Tree. Click the BMC tab.

Parameter Description

Parameter	Value	Description
External Time Interface	shelf ID(shelf name)-slot number-board name-external clock interface	Indicates the name of the input interface of the external clock source on the NE.
Time Quality Level	0 to 255	Indicates the time that the master clock equipment delivers or the frequency traceability. The smaller the value, the higher the clock quality.
Time Precision	0 to 255	Indicates the time precision of the master clock or the expected time precision of the equipment that will become a master clock. The smaller the value, the higher the clock precision.
PTP Clock Source Type	ATOMIC_CLOCK, GPS, TERRESTRIAL_RADIO, PTP, NTP, HAND_SET, OTHER, INTERNAL_OSCILLATOR Default: INTERNAL_OSCILLATOR	Displays the type of the clock source that the NE traces.
PTP Clock Source Priority 1	0 to 255 Default: 128	Indicates the clock priority. The smaller the value, the higher the clock priority.
PTP Clock Source Priority 2	0 to 255 Default: 128	Indicates the clock priority. This parameter is supplementary to Clock Source Priority 1. The smaller the value, the higher the clock priority. When the Clock Source Priority 1 values of two clock sources are the same, determine the priority of the clock sources according to their Clock Source Priority 2 values.
PTP Clock Source Deviation	0 to 65535 Default: 32768	Specifies the deviation of the master clock compared with the standard time, that is, the master clock is earlier or later than the standard time. The smaller the value, the smaller the clock deviation. The smaller the clock deviation, the better the clock signal.