Siemens AC75 - page 350

AC75 AT Command Set

11.22 Using GPRS AT commands (Examples) s

AC75_ATC_V01.002 Page 350 of 569 10/30/06

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EXAMPLE 2

Quality of Service (QoS) is a special parameter of a CID which consists of several parameters itself.

The QoS consists of

- the precedence class

- the delay class

- the reliability class

- the peak throughput class

- the mean throughput class

and is divided in "requested QoS" and "minimum acceptable QoS".

All parameters of the QoS are initiated by default to the "network subscribed value (= 0)" but the QoS itself is

set to be undefined. To define a QoS use the AT+CGQREQ or AT+CGQMIN command.

Overwrite the precedence class of QoS of CID 1 and set the QoS of CID 1 to be present:

A following read command will respond:

All QoS values of CID 1 are set to network subscribed now, except precedence class which is set to 2. Now

set the QoS of CID 1 to not present:

Once defined, the CID it can be activated. To activate CID 2 use:

If the CID is already active, the mobile responds OK at once.

If no CID and no STATE is given, all defined CIDs will be activated by:

If no CID is defined the mobile responds +CME ERROR: invalid index

Remark: If the mobile is NOT attached by AT+CGATT=1 before activating, the attach is automatically done by

the AT+CGACT command.

After defining and activating a CID it may be used to get online by:

The mobile supports Layer 2 Protocol (L2P) PPP only.

Remark: If the mobile is NOT attached by AT+CGATT=1 and the CID is NOT activated before connecting,

attaching and activating is automatically done by the AT+CGDATA command.

Some providers (e.g. Vodafone or E-Plus) require to use an APN to establish a GPRS connection. So if you

use the Microsoft Windows Dial-Up Network and ATD*9... to connect to GPRS you must provide the context

definition as part of the modem definition (Modem properties/Connection/Advanced.../Extra settings). As an

alternative, you can define and activate the context in a terminal program (e.g. Microsoft Hyperterminal) and

then use the Dial-Up Network to send only the ATD command.

AT+CGQREQ=1,2

AT+CGQREQ?

+CGQREQ: 1,2,0,0,0,0

AT+CGQREQ=1

AT+CGACT=1,2

AT+CGACT=

AT+CGDATA="PPP",1

CONNECT

The mobile is connected using the parameters of CID 1.

AT+CGDATA=

CONNECT

The mobile is connected using default parameters (<L2P>="PPP" and

<cid> as described for command AT+CGDATA).