AT Command Set
MC35_ATC_01_V04.00 Page 167 of 238 02.04.2002
6.4 Using GPRS AT commands (examples)6.4.1 Miscellaneous AT commands
Defining and using a Context Definition Id (CID):
Every time a CID is used as a parameter for a GPRS command the CID has to b e defined before by
the AT+CGDCONT command. To get the parameter of a CID use the AT+CGDCONT read option. If
the response of ‘AT+CGDCONT?’ is OK only, there is no CID defined.
AT+CGDCONT?
OK // there is no CID defined
All parameters of the CID are initiated by NULL or not present values and the CID itself is s et to be
undefined. To define a CID use the AT+CGDCONT Command with at least one CID parameter. At the
moment the mobile supports CID 1 and CID 2 by using the AT+CGDCONT comm and.
Examples:
AT+CGDCONT=1,IP
OK // defines CID 1and sets the PDP type to IP
// access point name and IP address aren't set
AT+CGDCONT=2,IP, "internet.t-d1.gprs", 111.222.123.234
OK // defines CID 2 ans sets PDP type, APN and IP addr
A following read command will respond
AT+CGDCONT?
+CGDCONT:1,IP
+CGDCONT:2,IP," internet.t-d1.gprs",111.222.123.234
OK
AT+CGDCONT=1
OK // sets the CID 1 to be undefined
A following read command will respond
AT+CGDCONT?
+CGDCONT:2,IP, "internet.t-d1.gprs",111.222.123.234
OK
Quality of Service (QoS) is a special parameter of a CID which c onsists of several parameters itself.
The QoS consists of
• the precedence c lass
• the delay class
• the reliabili ty class
• the peak throug hput class
• the mean through put class
and is devided in "requested QoS" and "minimum acceptable Q oS".