Configuring the Reference Interface for Deviation Measurement

A reference interface for deviation measurement can be configured on a device to connect to the reference source (such as the BITS meter or Atom GPS) so that the device and NCE can calculate and automatically compensate for the deviation. In the intelligent clock solution, the reference interface-based deviation measurement mode is generally used when base stations cannot obtain the GPS deviation value.

Context

Only an interface supporting 1588 synchronization can be configured as the reference interface. You can query the synchronization capability of interfaces using commands.

On a ring network as shown in Figure 1, select a reference interface that supports 1588 synchronization on the device where the passive interface is located. On a chain network, select a reference interface that supports 1588 synchronization at the end node of the chain.

Figure 1 Measurement on a Ring Network

Procedure

Run display clock device-capability
The synchronization capability of interfaces is displayed. The interface whose 1588 attribute is Yes supports 1588 synchronization.
Run system-view
The system view is displayed.
Run ptp standard-time-port
The reference interface is configured based on the interface type.
Run commit
The configuration is committed.
Log in to iMaster NCE, and stop the measurement based on the result determined by iMaster NCE, or select the next device to continue the measurement as prompted.

Follow-up Procedure

After iMaster NCE obtains the network-wide deviation data and delivers the compensation value, run the undo command to delete the reference interface configurations of all devices to prevent interference to normal service running.