Multi-Tech Systems CDMA Wireless Modem CHAPTER 1

Chapter 1 - Introduction

Multi-Tech Systems, Inc. CDMA Wireless AT Commands - PN S000294C 11

CHAPTER 1 - INTRODUCTION

The AT command set is one of the main interfaces for the modem to interact with an external application

layer. CDMA AT commands are defined in TIA/EIA/IS707.3. However, as the wireless applications increase,

TIA/EIA/IS707.3 is not sufficient. In addition, a lot of GSM applications already exist and GSM customers

would like to maintain the same interface in order to make no or minimum changes to the applications to be

used with CDMA modem. To meet the all these needs, CDMA AT command set is designed to cover:

1) IS707.3 AT commands;

2) GSM 07.07 when applicable;

3) GSM 07.05 when applicable,

4) ITU-T v25 when applicable;

5) Proprietary AT set;

6) Customer specific AT commands;

7) Qualcomm defined AT commands.

Please note that in several instances, the GSM 7.07 and 7.05 specifications could not be followed because

of fundamental differences between CDMA and GSM call processing behaviors. In these cases, minimal

changes were made to the GSM-related commands.

This document describes the CDMA AT command, its syntax, its responses, and result codes. It serves as

the reference for wireless application development based on the CDMA modem and for its integration and

testing. The intended audience is expected to be familiar with CDMA data services protocol and AT modem

commands.

This document is also intended for use in the North American market. SIM/R-UIM and its related AT

commands are not documented here.

This interface specification is based on the following recommendations or standards:

1. ETSI GSM 07.05: Digital cellular telecommunications system (Phase 2); Use of DTE-DCE interface for

Short Message Service (SMS) and Cell Broadcast Service (CBS)

2. ETSI GSM 07.07: Digital cellular telecommunications system (Phase 2); AT command set for GSM

Mobile Equipment (ME)

3. ITU-T Recommendation V.25 ter: Serial asynchronous automatic dialing and control

4. ETSI GSM 03.40: Digital cellular telecommunications system (Phase 2); Technical implementation of the

Short Message Service (SMS) Point-to-Point (PP)

5. ETSI GSM 03.38: Digital cellular telecommunications system (Phase 2); Alphabets and language-

specific information

6. ETSI GSM 04.80: Digital cellular telecommunications system (Phase 2): Mobile radio interface layer 3,

Supplementary service specification, Formats and coding

7. TIA/EIA/IS-707.3: Data Service Options for Wideband Spread Spectrum Systems: AT Command

Processing and the Rm Interface

8. Qualcomm Application Note (CL93-V0327-1 X10): AT COMMANDS FOR DMSS

9. IS-131: Data Transmissions Systems and Equipment – Extensions to Asynchronous Dialing and Control.