From the Navigation menu, select Port → PDH/TDM Port → T1/E1.

Result:

The T1/E1 Interface Configuration screen appears.

Enter the required parameters to configure the external timing references, then click Submit

From the Navigation menu, select Port → PDH/TDM Port → T1/E1 Summary and verify that the external reference parameters were provisioned correctly.

Result:

The T1/E1 Interface Summary screen appears.

From the Navigation menu, select Timing → System Timing → Configuration.

Result:

The System Timing Configuration screen appears.

Important!

The System Timing Source parameter must be provisioned to BITS for external timing.

Enter the required System Timing Source and Differential Timestamp Frequency (VLNC6x circuit packs only) parameters, then click Submit.

Important!

On VLNC64 circuit packs, when the System Timing Source parameter is provisioned to BITS, the OC-3/STM-1 interface may be provisioned as an alternate source of timing (Line). Provisioning an alternate source for System Timing is optional.

From the Navigation menu, select Timing → System Timing → Summary and verify that the system timing parameters were provisioned correctly.

Result:

The System Timing Summary screen appears.

End of steps