# 2 Introduction to SS7

Purpose

This chapter will familiarize you with Signaling System 7 (SS7) and the operation of the SS7 network. This chapter describes the CSP implementation of SS7 and provides concepts and information necessary to use the SS7 PQ and SS7 Series 3 cards. For a list of the common acronyms used in SS7, see the Appendix of this book.

The SS7 PQ and SS7 Series 3 cards provide Signaling System 7 connectivity for CSPs, and also provides a fully integrated solution for both switching and advanced signaling applications.

In this guide, where reference is made to "SS7 cards", the reference is for both the SS7 PQ card and the SS7 Series 3 card.

In this section:

Basics of SS7

SS7 Software Architecture

Configuring SS7

SS7 CIC Group Querying

SS7 CIC Traffic Over the DS3 Line Card

Causes of SS7 Signaling Link Problems

TCP/IP with SS7

Configuring TCP/IP with SS7

Configuring SS7 Card Redundancy

SS7 Local Host Initiated Redundancy Switchover

SS7 Fault Conditions & Fault Recovery

SS7 Card Synchronization

SS7 Redundancy: Disabling, Reconfiguring and Querying

SS7 Host Link Failure Detection

SS7 Host Link Failure Detection Architecture

SS7 Host Link Failure Detection and Recovery

SS7 Polling and Host Link Failure

SS7 Signaling Stack Congestion Control

CSP Response to Congestion

Configuring SS7 Virtual Spans

Configuring SS7 10K Virtual Channels

Configuring JT ISUP Variant Stack

Combined Link Set

Dual Ethernet Port for SS7 Series 3 Card

Message Transfer Part (MTP)

MTP3 for Japanese Telecommunications

MTP3-to-Host

MTP3-to-Host Functionality

Software Modifications

Configuring MTP3-to-Host

MTP3-to-Host Example

SS7 Raw Data to Host

SS7. A common channel signaling protocol providing supervision, alerting, and addressing services.
See Signaling System Number Seven.