Maintaining the Circuits on the A Interface

This describes how to query the circuit state on the A interface, and how to block, unblock, and reset the A interface circuits based on the query results.

Prerequisites

The LMT runs normally.
The communication between the LMT and the BSC is normal.
The GEIUA or the GOIUA is functional.

Context

You can reset the A interface circuits, that is, the A interface circuits of the entire BSC or the A interface circuits between two signaling links of the MSC. This operation may affect the services. Therefore, perform this task with caution.

The BSC6000 can provide 32 A interface circuits of 64 kbit/s. You can query the status of these 32 circuits and block, unblock, or reset any circuit on the LMT.

The state of the A interface circuits is classified into seven types: Blocked, Failure, Idle, Occupied, Peer Blocked, Uninstalled, and Peer Uninstalled. For details, see Table 1.

**Table 1** Status of A Interface circuits
State	Description
Idle	The current circuit does not carry services.
Occupied	The current circuit is transmitting services.
Failure	The current circuit is unavailable.
Blocked	The current circuit is blocked manually.
Peer Blocked	The current circuit is blocked manually from the MSC side.
Uninstalled	The current circuit is used to transmit clock signals instead of services.
Peer Uninstalled	The BSC is configured with CICs, but the MSC is not.

Procedure

Through GUI
1. On the LMT, choose BSC Maintenance > Maintain User Resource > Maintain A Interface Circuit. The Maintain A Interface Circuit dialog box is displayed, as shown in Figure 1.
2. Select Subrack No., type the Circuit Identification Code (CIC) range, and then click Query. The query results are displayed, as shown in Figure 1.
  Figure 1 Querying A interface state
  
  NOTE:
  In the A Interface Location area, if State is selected, the result will be displayed based on the filtering condition selected.
  
  If State is not selected, the status of all the A interface circuits within the CIC range will be displayed.
3. Select one or more query results, and click Block, Unblock, or Reset.
Through MML
1. You can run the following commands on the Local Maintenance Terminal to maintain A interface circuits.
  - Run the DSP ACIC to query the status of A interface circuits.
  - Run the RST ACIC command to reset A interface circuits.
  - Run the UBL ACIC command to uninhibit A interface circuits.
  - Run the BLK ACIC command to inhibit A interface circuits.