Cambium Networks PTP 820 Series User Manual page 599

Chapter 10: Synchronization
2. In the Priority 2 field, you can select a value between 0 and 255. The default value is 128. The Priority 2 value
is one of the factors used by the BMCA to determine the grandmaster. The PTP 820's Boundary Clock node
advertises this value when it is not locked on an external grandmaster.
3. In the Domain Number field, you can select a value between 24 and 43. The default value is 24.
4. In the Local Priority field, you can select a value between 1 and 255. The default value is 128. The Local
Priority value is taken into account when two identical announce messages are received by at least two
different ports. In such a case, the Boundary Clock mechanism selects the slave port based on the best
(lowest) Local Priority.
5. In the Max Step removed field, you can select the maximum number of PTP clocks traversed from the
grandmaster to the slave clock in the local PTP 820 Boundary Clock node. The value range is 1-255. The
default value is 255. If the defined number is exceeded, packets from this grandmaster candidate are
discarded and the grandmaster will not be eligible for use by the Boundary Clock node.
6. To implement your changes, click Apply.
The following Table lists and describes the read-only Boundary Clock default parameters.
Table 115 Boundary Clock Default Parameters
Parameter
Two Step
Clock Identity
Number of Ports
Clock Class
Clock Accuracy
Offset Scaled Log Variance
Slave Only
Priority 1
Displaying the Boundary Clock Advanced Parameters
To display and set the Boundary Clock advanced parameters:
1. Select Sync > 1588 > Boundary Clock > Clock Parameters > Advanced. The 1588 Boundary Clock – Clock
Advanced Parameters page opens.
Definition
Indicates whether the Boundary Clock node is operating in two-step
mode. In PTP 820, this is always set to Yes.
Identifies the system clock.
Displays the number of ports on the unit on which Boundary Clock is
enabled. The maximum is 4 per PTP 820 unit.
One of the elements of the clock quality, as defined in IEEE-1588.
One of the elements of the clock quality, as defined in IEEE-1588.
One of the elements of the clock quality, as defined in IEEE-1588.
Indicates whether the Boundary Clock node is operating in slave
mode only. In PTP 820, this is always set to No.
Always displays 128.
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Configuring 1588 Boundary Clock