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Chapter 1

Introduction

: 1.1 Introduction
: 1.2 SS7 Architecture

1.1 Introduction

The SS7 Signaling Connection Control Part (SCCP) API provides the interface for host applications to access the routing and network transport services of the SS7 SCCP layer. The TX Series SCCP implementation supports the following services. Connectionless Service - Basic (class 0) and Sequenced (class 1) connectionless service. Connection-oriented Service - Basic (class 2) and Flow-Control (class 3) connection-oriented services. Global Title Translation - Translation of global titles into point codes and subsystem numbers (SSNs). Routing based on global title, global title and SSN, or destination point code with global title and/or SSN. Compliance with ITU-T Q.711 - Q.717 and ANSI T1.112 recommendations.
The remainder of this section describes the SS7 software architecture. Subsequent sections of this document describe the general characteristics and operation of the SCCP API as well as a detailed specification of the messages and function calls that comprise the API.

1.2 SS7 Architecture

Figure 1 shows the SS7 software architecture in a typical system with separate host applications handling the data/control (SCCP) interface, system configuration, and system alarms. The system consists of the following components.
On the TX Series board: The SCCP task running on the TX Series board. This task implements the SS7 SCCP layer. The MTP task running on the TX Series board. This task implements the SS7 MTP-2 (data link) layer and the MTP-3 (network) layer. The (optional) ISUP task running on the TX Series board. This task implements the SS7 ISUP layer. The NETMGR task running on the TX Series board. This task coordinates all configuration and management traffic between the host and the SS7 tasks on the TX Series board. The TX Series Alarms Manager task. This task collects unsolicited alarms (status changes) generated by the SS7 tasks and forwards them to the host for application-specific alarm processing.
On the host: A TX Series driver for the native host operating system which provides low level access to the TX Series board from the host. A function-call based API which provides the application with a high-level interface to the SCCP layer services. For many host operating systems, a log process is provided for capturing alarms and saving them to a text file. For many host operating systems, a configuration process is provided which reads the SS7 configuration file(s) and loads the configuration to the TX Series tasks at system startup. Figure 1. SS7 System Architecture

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