| Parameter Name | Top Reference Clock | 
|---|---|
| Description | This parameter specifies the type of the 8 kHz reference clock in the GSCU. The reference clock is of three types: GGCU panel 8 kHz clock, GGCU backplane 8 kHz clock, and line clock. | 
| GUI Value Range | [Invalide,GGCU Backplane,GGCU Plane,LINE CLOCK] | 
| Default Value | Invalide | 
| Unit | None | 
| Step | - | 
| Modification Rules | None | 
| Configuration Policy | None | 
| Recommended Value | None | 
| Parameter Relationship | None | 
| BSC Feature | None | 
| Parameter Class | Parameters About Equipment | 
| Caution | None |