Velocity Edge GX440 Specifications download pdf (Page 17)

Modem Basics

Connection Modes

The MP 700 Series GPS operates in three modes:

Circuit-switched data (CSD) In Circuit Switched Data

(CSD) mode, the modem operates much like a landline

modem.

The Fallback feature must be configured to allow for this type

of connection. (See

!MPFBSETUP on page 41.)

Packet-switched data In this mode the modem establishes a

high-speed packet data connection using GPRS or EDGE service.

Voice If your account allows for it, you can attach a headset to

your modem and use it as a mobile phone. You require a 4-wire

headset with a 2.5 mm connector, to use your modem as a phone.

(This plugs into the Audio connector on the back of the

modem. You may need an extension cable if the modem is

installed in the trunk. Contact your service provider to

determine what extension cables are supported.)

States

The modem’s state indicates what form of communication is

occurring between the modem and the host computer.

At any time the modem is in one of two states:

Command The modem exchanges data with the host

computer as AT commands and replies. During voice commu-

nications the modem is always in command state.

Data The modem exchanges computer data with the host.

Note: The modem cannot be in voice mode and 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

The modem’s condition indicates whether there is a network

connection (airlink). At any time, the modem is in one of two

conditions:

Online Actively connected to a remote terminal or network

(off-hook). In the online condition, the modem can either be in

command state or in data state.

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Velocity Edge GX440 Specifications Page 17