Siemens MC55 AT AT+CGQREQ=1,2, AT+CGACT=1,2, At+Cgact=, AT+CGDATA=PPP,1, Connect, At+Cgdata=

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:

AT+CGQREQ=1,2

OK

A following read command will respond:

AT+CGQREQ?

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

OK

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:

AT+CGQREQ=1

OK

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

AT+CGACT=1,2

OK

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:

AT+CGACT=

OK

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:

AT+CGDATA="PPP",1	The mobile is connected using the parameters of CID 1.
CONNECT

AT+CGDATA=

CONNECTThe mobile is connected using default parameters (<L2P>="PPP" and <cid> as described for command AT+CGDATA).

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.

MC55_ATC_V04.00	Page 299 of 475	3/17/06
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