In the networking, some equipment supports only the ITU-T protocol and does not support the ANSI protocol on the MTP layer. The upper MAP layer, however, adopts the ANSI protocol. In this case, the equipment adopts the ANSI message sent from the MAP layer to the ITU-T message that can be transmitted on the ITU-T links. When this equipment interworks with a network device that supports the ANSI links, a signaling point code (SPC) translation device is required to translate the two protocols. The SG is an SPC translation device.

Note that this service is not universal. The method of configuring the service is determined by the actual conditions of the network.

Configuring Protocol Translation Service Data

The protocol translation service enables the mutual transfer of signaling messages between the network using ITU-T protocol (14 bits) and the network using ANSI protocol (24 bits). Before configuring the protocol translation service data, make sure that the hardware data, MTP data, and SCCP data are already configured.

• Protocol Translation Service
  In the networking, some equipment supports only the ITU-T protocol and does not support the ANSI protocol on the MTP layer. The upper MAP layer, however, adopts the ANSI protocol. In this case, the equipment adopts the ANSI message sent from the MAP layer to the ITU-T message that can be transmitted on the ITU-T links. When this equipment interworks with a network device that supports the ANSI links, a signaling point code (SPC) translation device is required to translate the two protocols. The SG is an SPC translation device.

       Service Flow

• Networking Structure
  This illustrates the networking structure for configuring the protocol translation service.

• Service Implementation
  This illustrates the implementation of the protocol translation service in two forms;

Converting ANSI Message to ITU-U Message

1. The SG receives an SCCP message (24 bits) sent from the ANSI network.
2. The SG queries the mapping table of 14-bit and 24-bit SPCs and judges whether to translate the protocol and then forwards the message to the ITU-U network (using 14-bit SPC).
3. If yes, the SG translates the protocol and transfers the message to the ITU-T network. If not, the SG does not translate the protocol and transfers the message to the ANSI network.

Converting ITU-U Message to ANSI Message

1. The SG receives an SCCP message (14 bits) sent from the ITU-T network.
2. The SG queries the mapping table of 14-bit and 24-bit SPCs and judges whether to translate the protocol and then forwards the message to the ANSI network (using 24-bit SPC).
3. If yes, the SG translates the protocol and transfers the message to the ANSI network. If not, the SG does not translate the protocol and transfers the message to the ITU-T network.

Configuration Principles:

·         All the ANSI signaling points (SPs) that may send messages to the ITU-T SPs must be configured in the SPC translation management table. The SPs that can be converted through default adding or deleting 0x80 cannot be configured in the table.

·         All the ITU-T SPs to be performed with protocol translation must be set in the protocol translation DSP set table. These devices must be distinguished from each other.

 

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