Sierra Wireless MP 700 Series, Command Reference Manual

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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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