Velocity Edge GX440 Spécifications télécharger pdf (Page 13)

2: Modem Basics

• GSM, GPRS, and

EDGE

• Modem modes, states,

and conditions

• State Transitions

• Modem Buffers

• Command Handling

• Responses and Result

Codes

• Response and Result

Framing

• GPS data format This section provides the information required to:

• Establish a communications session with the modem that

will allow you to enter AT commands

• Understand the operating modes and states of the modem

and what causes the modem to transition between them

• Understand which commands are available during

connections and which are not

• Understand how the modem’s results and responses are

framed and change the framing where required

GSM, GPRS, and EDGE

The MP 700 Series GPS operates on GSM network technology.

GSM (Global System for Mobile communications) is a type of

wireless communications network designed for mobile phones

that is widely deployed throughout the world. GPRS (General

Packet Radio Service) and EDGE (Enhanced Data rates for

GSM Evolution) are add-on data services to GSM networks.

GPRS provides a maximum data transmission speed of

56 kbps while EDGE provides a maximum data transmission

speed of 216 kbps. The MP 750 GPS supports GPRS while the

MP 775 GPS supports GPRS and EDGE service.

GPRS service has been implemented on most GSM networks

but there are a few areas (mainly rural areas in Europe) with

GSM coverage but no GPRS service. EDGE is less widely

implemented. The MP 700 Series GPS modem is primarily

designed to provide GPRS/EDGE data connections but the

modem can also be configured (using the Fallback feature) to

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Velocity Edge GX440 Spécifications Page 13