Overview

Introduction

The Frequency Shift Keying (FSK) feature, supported by the DSP Series 2 card, involves the transmitting and receiving of FSK modulated signals.

FSK is a modulation technique used by modems in which two different frequencies are used to represent the binary state of 1s and 0s as tones across telephone lines.

This feature supports both European Telecom (ETSI) and China Telecom (CTSI) SMS protocols and Caller ID.

FSK Functionality

The FSK feature supports the following functionality:

Caller ID/Call Naming Information

Transmitting information related to an incoming call. For example, Calling Line Identification Presentation (CLIP) and related services such as Message Waiting Indicator and Advice of Charge Information in an inband signal on a FXS (Foreign Exchange Station) line.

Short Message Service (SMS)

• ETSI SMS System Architecture

• CTSI SMS System Architecture

FSK provides the transmitting and receiving of Short Message Service (SMS) data and signaling information on the DSP Series 2 card. Customers will be able to build applications to use the CSP as a Short Message Service Center (SM-SC) for the wireline markets.

API Reference Data

• New and Modified API Messages

• New and Modified Tag Length Value (TLV) Blocks

• Modified Information Control Block

Glossary

CAS (Dual Tone-Alerting Signal)

DTMF (Dual Tone Multi-Frequency)

FSK (Frequency Shift Keying)

ISDN (Integrated Services Digital Network)

LE (Local Exchange)

PSTN (Public Switched Telephone Network

SAS (Subscriber Alerting Signal)

SM (Short Message)

SMS (Short Message Service)

Server (Short Message Server)

CPE (Customer Premesis Equipment)

TAS (TE Alerting Signal)

TE (Terminal Equipment)