Configuring the Subrack Communication Link

This describes how to configure the communication links between the GMPS and the GEPS or between GEPSs. The links are responsible for the TDM switching between subracks.

Scenario	BSC initial configuration and BSC capacity expansion
Mandatory/Optional	Optional. Perform this operation when the default attributes of the communication links between subracks need to be modified.

NOTE:

• By default, the communication links between fully connected subracks are configured by the LMT software when subracks are added. The attributes of the communication links between subracks can be modified.
• A maximum of three communication links can be configured between two subracks. In actual situations, a pair of active and standby communication links are usually configured between subracks.
• The communication between subracks is achieved through the GTNU in each subrack. There are six external ports, numbered TDM0-TDM5, on the panel of the GTNU. Each port can be used by only one communication link between subracks.

Prerequisite

Preparation

NOTE:

Assume that the BSC is configured with one GMPS and two GEPSs. The GMPS is numbered 0, and the GEPSs are numbered 1 and 3.

The following procedure describes how to configure the mesh interconnection between subracks in TDM transmission mode.

Table 1 Example of the data negotiated and planned for configuring the communication link between GMPS 0 and GEPS 1

Parameter	Example	Source
Subrack1 No.	0	BSC internal planning
Subrack2 No.	1	BSC internal planning
Subrack1 TDM No.	0 (active), 1 (standby)	BSC internal planning
Subrack2 TDM No.	0 (active), 1 (standby)	BSC internal planning

Table 2 Example of the data negotiated and planned for configuring the communication link between GMPS 0 and GEPS 3

Parameter	Example	Source
Subrack1 No.	0	BSC internal planning
Subrack2 No.	3	BSC internal planning
Subrack1 TDM No.	2 (active), 3 (standby)	BSC internal planning
Subrack2 TDM No.	0 (active), 1 (standby)	BSC internal planning

Table 3 Example of the data negotiated and planned for configuring the communication link between GEPS 1 and GEPS 3

Parameter	Example	Source
Subrack1 No.	1	BSC internal planning
Subrack2 No.	3	BSC internal planning
Subrack1 TDM No.	2 (active), 3 (standby)	BSC internal planning
Subrack2 TDM No.	2 (active), 3 (standby)	BSC internal planning

Procedure

• Configure the communication link between GMPS 0 and GEPS 1.
  1. On the BSC6000 Local Maintenance Terminal, right-click the BSC6000 root node.
  2. Choose Configure Subrack Communication Link from the shortcut menu. A dialog box is displayed, as shown in Figure 1.
     Figure 1 Configure Subrack Communication Link dialog box
     
     

  3. Click Add. A dialog box is displayed, as shown in Figure 2.
     Figure 2 Add Subrack Communication Link dialog box
     
     

  4. Set the parameters by referring to Table 1.
  5. Click OK. The first communication link between GMPS 0 and GEPS 1 is configured.
  6. Repeat 1 through 5 to configure the second communication link between GMPS 0 and GEPS 1.
• Configure the communication link between GMPS 0 and GEPS 3.
  1. On the BSC6000 Local Maintenance Terminal, right-click the BSC6000 root node.
  2. Choose Configure Subrack Communication Link from the shortcut menu. A dialog box is displayed, as shown in Figure 3.
     Figure 3 Configure Subrack Communication Link dialog box
     
     

  3. Click Add. A dialog box is displayed, as shown in Figure 4.
     Figure 4 Add Subrack Communication Link dialog box
     
     

  4. Set the parameters by referring to Table 1.
  5. Click OK. The first communication link between GMPS 0 and GEPS 3 is configured.
  6. Repeat 1 through 5 to configure the second communication link between GMPS 0 and GEPS 3.
• Configure the communication link between GEPS 1 and GEPS 3.
  1. On the BSC6000 Local Maintenance Terminal, right-click the BSC6000 root node.
  2. Choose Configure Subrack Communication Link from the shortcut menu. A dialog box is displayed, as shown in Figure 5.
     Figure 5 Configure Subrack Communication Link dialog box
     
     

  3. Click Add. A dialog box is displayed, as shown in Figure 6.
     Figure 6 Add Subrack Communication Link dialog box
     
     

  4. Set the parameters by referring to Table 3.
  5. Click OK. The first communication link between GEPS 1 and GEPS 3 is configured.
  6. Repeat 1 through 5 to configure the second communication link between GEPS 1 and GEPS 3.