Cambium Networks PTP 820 Series, User Manual, Page: 585 / 1149

Chapter 10: Synchronization Configuring the Sync Source
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Configuring the Sync Source
Frequency signals can be taken by the system from Ethernet and radio interfaces.
The reference frequency may also be conveyed to external equipment through different interfaces. For
instructions how to configure the outgoing clock, see
Configuring the Outgoing Clock and SSM Messages .
Frequency is distributed by configuring the following parameters in each node:
•
System Synchronization Sources – These are the interfaces from which the frequency is taken and distributed
to other interfaces. Up to 16 sources can be configured in each node. A revertive timer can be configured. For
each interface, you must configure:
o
Priority (1-16) – No two synchronization sources can have the same priority.
o
Quality – The quality level applied to the selected synchronization source. This enables the system to
select the source with the highest quality as the current synchronization source.
•
Each unit determines the current active clock reference source interface:
o
The interface with the highest available quality is selected.
o
From among interfaces with identical quality, the interface with the highest priority is selected.
Note
You can configure a revertive timer for the PTP 820G or PTP 820F unit. When the revertive timer is
configured, the unit will not switch to another synchronization source unless that source has been
stable for at least the number of seconds defined in the revertive timer. This helps to prevent a
situation in which numerous switchovers occur when a synchronization source reports a higher
quality for a brief time interval, followed by a degradation of the source's quality. By default, the
revertive timer is set to 0, which means that it is disabled. Configuration of the revertive timer must
be performed via CLI. See
Configuring the Revertive Timer (CLI) .
When configuring the Sync source, the Sync mode must be set to its default setting of automatic. To display the
current Sync mode, enter the following CLI command in root view:
root> platform sync mode show
If the Sync mode is set to pipe, you must set it to automatic by entering the following CLI command in root view:
root> platform sync mode set automatic
When configuring an Ethernet interface as a Sync source, the Media Type of the interface must be RJ45 or SFP, not
Auto-Type. To view and configure the Media Type of an Ethernet interface, see Configuring Ethernet Interfaces.
Viewing the Sync Source Status
To view the current sync source and its quality:
1. Select Sync > Sync Source . The Sync Source page opens. Figure 344 Sync Source Page