User Guide for FibeAir® IP-20 All-Outdoor Products, CeraOS 10.5
Page 361 of 825
Ceragon Proprietary and Confidential
9.2
Configuring the Sync Source
Note
:
To configure a sync source on which the sync source Quality
parameter must be set according to ANSI specifications. You must
change the ETSI/ANSI mode to ANSI before configuring the sync
source. See
Changing the ETSI/ANSI Mode (CLI)
The 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:
◦
Priority (1-16)
–
No two synchronization sources can have the same
priority.
◦
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:
◦
The interface with the highest available quality is selected.
◦
From among interfaces with identical quality, the interface with the
highest priority is selected.
Note:
You can configure a revertive timer. 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
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