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Chapter 1 – Introduction

CDMA 1xEV-D0 AT Commands Reference Guide (Document S000482B) 10

An alternate (and more common) method is to place a QNC call by dialing a special number provided by

your carrier. QNC provides a mechanism to connect to the Internet using PPP, without using an intermediate

modem. This is functionally identical to using Dial-Up Networking for a PPP connection to an Internet Service

Provider (TCP/IP) on a standard landline modem. QNC offers a faster call connection time than standard

CSC calls. This is also available in IS-95 coverage.

EV-DO products introduce a third data connection type, using 1X service. This is a packet data connection

that does not tie up a circuit (or channel), but rather operates like a packet switched network, in which

multiple users share the resources and only use them when there is data to send or receive.

These three calling options are simply different methods of placing what amounts to a data call. As such they

are not included in the classification of modes, states, and conditions.

The commands and registers used depend on the modem’s operating mode. The state of the modem and its

condition also determine how the modem will behave in any given situation.

Modes

For the purposes of this document, the following are the modes of operation: Data and Voice.

Data (CSC, QNC, or Packet)

Connections to a PCS or cellular network for data transfers. This includes asynchronous (CSC) calls,

PPP packet connections to the network (QNC), and 1X packet service connections.

Voice

The product is being used for voice communication. In addition to the basic modes (data and voice),

there are states and conditions to consider.

States

The modem’s state, in conjunction with its condition, governs how the modem handles traffic to and from the

host (DTE), and to and from a remote modem. Data mode can support up to three states: Command, Pass

through, and Data.

Command

The modem exchanges data with the host (DTE) as AT commands and replies. This state handles

commands at the modem without the use of the airlink to the IWF modem. Voice modes are always

in command state.

Passthrough

The modem has an active airlink with the IWF but is otherwise in the Command state. Data from the

local host is passed through the modem to the IWF where it is executed as an AT command and

then reflected back for execution by the local modem. This state only applies to IS-95 calls, not 1X

packet connections.

Data

Communication is passed between the host and a remote terminal or network as computer data.

Note: Voice modes do not support the data state. Even while off hook with a voice call active,

the modem still communicates over the serial connection in command state. Commands can be

issued and executed while a voice call is in progress.

Conditions

In addition to mode and state the modem can be in one of two conditions: online and offline.

Online

Actively connected to a remote terminal or network (off-hook).

Offline

Disconnected from any remote terminal or network (on-hook).

While in offline condition the modem can only be:

• In command state (without an airlink), or

• In pass through state with an airlink to the IWF modem but without an active call.

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