Specifications

SIM900 AT Command Manual
SIM900_AT Command Manual_V1.03 158 12/24/2010
Definition stored in non-volatile memory
3 PDP Context Identifier 3
Default <cid>
Locked in non-volatile memory and is always defined, it can
not be changed by user.
<PDP_type> (Packet Data Protocol type)
IP Internet Protocol (IETF STD 5)
<APN> (Access Point Name) a string parameter(string should be
included in quotation marks) which is a logical name that is
used to select the GGSN or the external packet data
network. If the value is null or omitted, then the
subscription value will be requested.
<PDP_addr> a string parameter (IP address). Format:
"<n>.<n>.<n>.<n>" where <n>=0..255
If the value is null or equals 0.0.0.0 a dynamic address will
be requested. The allocated address may be read using the
+CGPADDR command
<d_comp> a numeric parameter that controls PDP data compression
0 –PDP data compression off (default if value is omitted)
<h_comp> a numeric parameter that controls PDP data compression
0 –PDP header compression off (default if value is omitted)
Reference Note
7.2.2.1For <cid> 1,2 and 3 the following parameters are stored in non volatile memory:
Parameter name Default value
<cid> 1,2 or 3
Locked 0xFF..0xFF
Defined 0x00
<precedence> 0x00
<delay> 0x00
<reliability> 0x03
<peak> 0x00
<mean> 0x00
<pdp_type> 0x01 (IP)
<APN> 0xFF..0xFF
<PDP_address> 0x00..0x00
<Guaranteed bitrate DL> 0x00
<Guaranteed bitrate UL> 0x00
<Traffic handling priority> 0x00