clock source ssm (system view)

Function

The clock source ssm command configures an SSM level for a clock source.

The undo clock source ssm command restores the SSM level for a clock source.

By default (not configured and not learned), the SSM level is dnu.

Format

clock source bits0 ssm { prc | ssua | ssub | sec | dnu | unk | prtc | eprtc | esec | eprc }

undo clock source bits0 ssm

clock source ptp ssm { prc | ssua | ssub | sec | dnu | unk | prtc | eprtc | esec | eprc }

undo clock source ptp ssm

Parameters

Parameter	Description	Value
bits0	Specifies the bits clock source.	-
prc	Indicates that the SSM level is PRC (G.811 clock signal).	-
ssua	Indicates that the SSM level is SSUA (G.812 transit node clock signal).	-
ssub	Indicates that the SSM level is SSUB (G.812 local node clock signal).	-
sec	Indicates that the SSM level is SEC.	-
dnu	Indicates that the SSM level is not used for clock synchronization.	-
unk	Indicates that the SSM level is unknown clock synchronization quality.	-
prtc	Indicates that the SSM level is PRTC (G.8272 clock signal).	-
eprtc	Indicates that the SSM level is EPRTC (G.8272.1 clock signal).	-
esec	Indicates that the SSM level is ESEC (G.8262.1 clock signal).	-
eprc	Indicates that the SSM level is EPRC (G.811.1 clock signal).	-
ptp	Specifies the ptp clock source.	-

Views

System view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
clksync	write

Usage Guidelines

Usage Scenario

A synchronization status message (SSM) transmits the quality level of timing signals on a synchronous timing link. Node clocks on a synchronization network parse the SSM to obtain the quality level of an upstream clock.

If SSM levels are configured to participate in clock source selection, the device selects a clock source to be traced based on the SSM levels of clock sources. To enable the clock sources to participate in clock source selection, configure SSM levels for the clock sources. 2 Mbps BITS clock signals have carried SSM levels, and therefore you do not need to configure SSM levels for 2 Mbps BITS clock sources.

The SSM levels in descending order are as follows:eprtc, prtc, eprc, prc, ssua, ssub, esec, sec, dnu.

Example

# Set the SSM level to prc for the clock source.

<HUAWEI> system-view
[~HUAWEI] clock source ptp ssm prc