Configuring the System Clock

This describes how to configure the system clock, that is, the input clock for the GGCU. The input clock for the GGCU can be the 2 MHz or 2 Mbit/s external clock or the line clock extracted from the MSC through the A interface board. The GGCU processes the input clock and generates the 8 kHz clock, which is used as the transmission synchronization clock and the time synchronization clock for the boards in the GMPS or GEPS.

Scenario	BSC initial configuration and BSC capacity expansion
Mandatory/Optional	Mandatory

NOTE:

The BITS clock is of two types: 2 MHz and 2 Mbit/s.
The system clock has four priorities: priority 1 to priority 4, from the highest to the lowest.
When the BITS clock is provided, it should be configured as the system clock and be set the highest priority

Prerequisites

The GGCU in the GMPS is configured. For details, see Configuring the GGCU.
The BITS clock is ready, or the line clock for the GMPS is configured.

Preparation

**Table 1** Example of the data negotiated and planned for configuring the system clock
Parameter	Example	Source
Priority	1	BSC internal planning
	2	BSC internal planning
	3	BSC internal planning
Source Type	2M external clock 0	BSC internal planning
	LINE0	BSC internal planning
	LINE1	BSC internal planning
Source Sub-type	2M_Hz	BSC internal planning
	8K_Hz	BSC internal planning
	8K_Hz	BSC internal planning

Procedure

On the BSC6000 Local Maintenance Terminal, right-click the BSC6000 root node.
Choose Configure System Clock from the shortcut menu. A dialog box is displayed, as shown in Figure 1.
Figure 1 Configure System Clock dialog box
Set the parameters by referring to Table 1.
Click Finish. The configuration of the system clock is complete.