Scenarios of BSC Initial Configuration

The procedure for BSC initial configuration varies with scenarios.

The BSC has different configuration modes in terms of subrack combination, PCU configuration, and Abis transmission. Table 1 lists these configuration modes.

**Table 1** Scenarios of BSC initial configuration
Category	Configuration Mode	Description
Subrack combination NOTE: The GMPS and GEPS are generally called BM. The GTCS is called TC for short. The BM and TC have three combination modes. Only one of them can be selected.	BM/TC separated	The BSC is configured with the GMPS, GEPS, and GTCS. In this case, the A interface uses the TDM transmission mode.
	BM/TC combined	The BSC is configured with the GMPS and GEPS. The boards of the GTCS are configured in the GMPS and GEPS. In this case, the A interface uses the TDM transmission mode.
	A over IP	The BSC is configured with the GMPS and GEPS. The GTCS is not configured. The A interface uses the IP transmission mode. In this case, the BSC must be connected to Huawei core network and the TC must be integrated into Huawei MGW.
PCU configuration NOTE: Only one mode can be selected.	Built-in PCU	The BSC processes the PS services and provides the Gb interface through the built-in PCU.
PCU configuration NOTE: Only one mode can be selected.	External PCU	The BSC is connected to the external PCU through the Pb interface. The PCU processes the PS services.
Abis transmission NOTE: The BSC supports the three modes simultaneously.	TDM transmission mode	The BSC communicates with the BTS through the TDM transmission.
	HDLC transmission mode	The BSC communicates with the BTS through the HDLC transmission. In this case, the BSC must be configured with the built-in PCU.
	IP transmission mode	The BSC communicates with the BTS through the IP transmission. In this case, the BSC must be configured with the built-in PCU.

There are six scenarios of BSC initial configuration in terms of subrack combination and PCU configuration. You can select one according to actual requirements.

The BSC initial configuration depends on the scenarios.

Initial Configuration Scenario: BM/TC Separated, Built-in PCU
When the BM and TC are configured in different subracks and the built-in PCU is used, you need to follow the fixed procedures and methods to perform the BSC initial configuration.
Initial Configuration Scenario: BM/TC Separated, External PCU
When the BM and TC are configured in different subracks and the external PCU is used, you need to follow the fixed procedures and methods to perform the BSC initial configuration.
Initial Configuration Scenario: BM/TC Combined, Built-in PCU
When the BM and TC are configured in the same subrack and the built-in PCU is used, you need to follow the fixed procedures and methods to perform the BSC initial configuration.
Initial Configuration Scenario: BM/TC Combined, External PCU
When the BM and TC are configured in the same subrack and the external PCU is used, you need to follow the fixed procedures and methods to perform the BSC initial configuration.
Initial Configuration Scenario: A over IP, Built-in PCU
When the BSC in A over IP transmission is configured with the built-in PCU, you need to follow the fixed procedures and employ correct methods to perform the BSC initial configuration.
Initial Configuration Scenario: A over IP, External PCU
When the BSC in A over IP mode is configured with the external PCU, you need to follow the fixed procedures and employ correct methods to perform the BSC initial configuration.

Parent topic: BSC Initial Configuration Guide (Based on LMT)