Configuring the Line Clock for the GTCS

The line clock of the BSC is provided by the MSC. When the BM and TC are configured in different subracks, each GTCS extracts the link clock from the A interface and uses the link clock as its reference clock.

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

NOTE:

• Each GTCS must be configured with a line clock.
• If the GEIUA is configured in the GTCS, two line clocks, line clock 0 and line clock 1, can be and must be configured on the E1/T1 of the A interface. If the GOIUA is configured in the GTCS, only one line clock can be and must be configured on port 0 on the GOIUA.

Prerequisites

Preparation

NOTE:

The following procedure takes how to configure two line clocks on the GEIUA in the GTCS as an example.

Table 1 Example of the data negotiated and planned for configuring the clock on line 0 for the GTCS

Parameter	Example	Source
Line No.	LINE0	BSC internal planning
Line Clock Type	8K	BSC internal planning
Board Slot No.	20	BSC internal planning
Board Port No.	0	BSC internal planning
Backup Port No.	2	BSC internal planning

Table 2 Example of the data negotiated and planned for configuring the clock on line 1 for the GTCS

Parameter	Example	Source
Line No.	LINE1	BSC internal planning
Line Clock Type	8K	BSC internal planning
Board Slot No.	20	BSC internal planning
Board Port No.	1	BSC internal planning
Backup Port No.	3	BSC internal planning

Procedure

1. On the BSC6000 Local Maintenance Terminal, right-click the edge of the GTCS.
2. Choose Configure Line Clock from the shortcut menu. A dialog box is displayed, as shown in Figure 1.
   Figure 1 Configuring the clock on line 0
   
   
   NOTE:

   When the A interface E1 where the port of the selected Board Port No. is located incurs a fault, the GTCS cannot extract the line clock from the A interface. In this case, the GTCS can extract the line clock from the A interface through the A interface E1 where the port of the selected Backup Port No. is located.

   • Board Slot No.: number of the slot where the GEIUA/GOIUA configured with the A interface E1 is located
   • Board Port No.: number of the port connected to one A interface E1 on the GEIUA/GOIUA
   • Backup Port No.: number of the port connected to another A interface E1 on the GEIUA

3. Set the parameters by referring to Table 1.
4. Click Add. The clock on LINE0 for the GTCS is configured.
5. Repeat 1 through 2 to open the configuration dialog box.
6. Select LINE1 and set the parameters by referring to Table 2, as shown in Figure 2.
   Figure 2 Configuring the clock on line 1
   
   

7. Click Add. The clock on LINE1 for the GTCS is configured.
8. Repeat 1 through 7 to configure the line clock for each GTCS.