Processing Path for Incoming PSTN-PSTN SS7 message on SG7000

The incoming path refers to the path of boards through which the SS7 signaling message accesses the SG7000 from the PSTN. Figure 1 shows the incoming processing path for PSTN-PSTN signaling.

NOTE:

·         When the front board of the SEPU is the SBPU, the SEPU can be configured with only the SHPU or SLPU.

·         When the front board of the SEPU is the SBPE, the SEPU can be configured with the SHPE.

This section takes the SBPU, the front board of the SEPU, for an example to describe the PSTN-PSTN incoming path.

Figure1:

 

·         The E1 interface of an SEPU provides a TDM Pulse Code Modulation (PCM) interface to access standard 64 kbit/s or 2 Mbit/s signaling links.

·         Based on the data configuration, the SEPU checks whether the signaling link should be processed by the SBPU in the same slot. If yes, the SEPU then processes message transfer part layer 1 (MTP1) messages, extracts signaling time slots, and transmits upper layer messages to the SLPU/SHPU in the same slot through the internal highway, as path (1) shown in Figure 1. If this signaling link should not be processed by the SBPU in the same slot, the SEPU transfers the signaling messages to the SEPU in the same slot with the destination SBPU through the H.110 bus. The destination SEPU processes MTP1 messages, extracts signaling time slots, and transmits upper layer messages to the SLPU/SHPU in the same slot through the internal highway, as path (2) shown in Figure 1.

·         When receiving the MTP2 message, the SLPU/SHPU sends it to the MTP3 module for processing.

·         After receiving the message, the MTP3 module distributes the message based on the service indicator (SI) and the DPC in the message. If the DPC in the message is the local SPC and the SI is SCCP, the MTP3 module sends the message to the SCCP module of this board. If the DPC is the local SPC and the SI is MTP3 management message, the MTP3 module sends the message to the MTP3 module of the HSYS. If the DPC is not the local SPC, the MTP3 module distributes the message based on the configured route.

 

 

Processing Path for Outgoing PSTN-PSTN SS7 message on SG7000

 

The outgoing path refers to the path of boards through which the SS7 gets out to the PSTN. Figure 2 shows the outgoing processing path for PSTN-PSTN signaling.

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·         When the front board of the SEPU is the SBPU, the SEPU can be configured with only the SHPU or SLPU.

·         When the front board of the SEPU is the SBPE, the SEPU can be configured with the SHPE.

This section takes the SBPU, the front board of the SEPU, for an example to describe the PSTN-PSTN outgoing path.

Figure 2:

 

·         The SBPU analyzes the destination point code (DPC). If the destination of the outgoing route is the board it self, the SBPU transmits the user layer messages to the SLPU/SHPU on the same board, as path (1) shown in Figure 2. Otherwise, based on the DPC, the SBPU transfers the user layer messages to the SBPU configured with the DPC route through the internal Ethernet cable. The SBPU then transmits the user layer messages to the SLPU/SHPU on the same board, as path (2) shown in Figure 2.

·         The SLPU/SHPU performs MTP2 message processing on the user layer messages, and then sends the processed signaling messages to the SEPU in the same slot through the internal highway cable.

·         If the outgoing route is configured on the SEPU, the SEPU directly sends the MTP messages to the PSTN through the E1/T1 interface, as paths (1) and (2) shown in Figure 2. If the outgoing route is configured on other SEPU, the SEPU then sends the MTP messages to the destination SEPU through the H.110 bus. The destination SEPU sends the MTP messages to the PSTN through the E1/T1 interface, as path (3) shown in Figure 2.

 

 

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