Maintaining the BSC Clock Reference Status

This describes how to query the status of the BSC clock reference for the GGCU. Check whether the PLL status of the BSC clock reference source is trace locked, check from which line clock the clock is obtained, and check the time when the PLL locks the clock.

Prerequisites

The LMT runs normally.
The communication between the LMT and the BSC is normal.
The GGCU is running properly.

Context

The GGCU is the clock board for the BSC system. After the clock reference signals are transmitted to the GGCU, a line of clock is selected in Manual or Automatic mode and converted to clock signals for the entire system after the phase-locked tracing. The clock signals are then transmitted to the GSCU in each subrack through the backplane or the panel.

Procedure

Through GUI
1. On the LMT, choose BSC Maintenance > Maintain Device > Query BSC Clock Reference State.
2. Set parameters in the Select GGCU Slot No. area, and then click Refresh. The query results are displayed, as shown in Figure 1.
  Figure 1 Querying the clock reference status
3. Click Cancel to end the query.
Through MML
1. Run the DSP CLKSTAT command on the Local Maintenance Terminal to query the BSC clock reference status.

Postrequisite

Without the clock reference, the BSC can still run for a period of time by using the free-run clock, but finally the BSC stops working.