SARA-R4/N4 series - AT Commands Manual
UBX-17003787 - R09
13 Packet switched data services
Page 120 of 307
13.1.3 Parameter definition
13.1.3.1 <APN>
The Access Point Name (APN) is a string parameter, which is a logical name, valid in the current PLMN's
domain, used to select the GGSN (Gateway GPRS Support Node) or the external packet data network to be
connected to. The APN can be omitted: this is the so-called "blank APN" setting that may be suggested by
network operators (e.g. to roaming devices); in this case the APN string is not included in the message sent
to the network.
The maximum length of the parameter is 99 characters (the maximum length of coded APN is 100 octets, see
3GPP TS 23.003 [
], subclause 9.1).
SARA-R4 / SARA-N4
An optional special code placed at the beginning of <APN> indicates the type of authentication handling
between the module and the network and may be:
• CHAP: challenge handshake authentication protocol
• PAP: personal authentication protocol
• NOAUTH: authentication protocol not used
• code omitted: authentication protocol not used
An example for the usage of <APN> is:
AT+CGDCONT=1,"IP","CHAP:internet.t-d1.de"
The information text response to the +CGDCONT read command does not include the PAP: and CHAP:
prefixes in the APN string.
13.1.3.2 <cid>
PDP context identifier. A numeric parameter specifying a particular PDP context definition. This parameter is
valid only locally on the interface DTE-MT.
The maximum number of definable and active PDP contexts depend(s) on the product version:
1
Product
Max number of
definable PDP contexts
Max number of active
PDP contexts
SARA-R4 / SARA-N4
8
8
13.1.3.3 <PDP_addr>
String parameter identifying the MT in the IP-address space applicable to the PDP service. If the value is null or
omitted (dynamic IP addressing), then a value may be provided by the DTE during the PDP startup procedure
or, failing that, a dynamic address will be requested via DHCP. It can be read with the command
or
To request a static IP address, a fixed IP address shall be specified for the <PDP_addr> paramater of the
set command and the user shall not rely on PPP negotiation via IPCP CONFREQ option.
Depending on the IP-version, the <PDP_addr> consists of 4 octets (IPv4) or 16 octets (IPv6):
• IPv4: "ddd.ddd.ddd.ddd"
• IPv4v6: "ddd.ddd.ddd.ddd ddd.ddd.ddd.ddd.ddd.ddd.ddd.ddd.ddd.ddd.ddd.ddd.ddd.ddd.ddd.ddd"
• IPv6: "ddd.ddd.ddd.ddd.ddd.ddd.ddd.ddd.ddd.ddd.ddd.ddd.ddd.ddd.ddd.ddd"
13.1.3.4 <PDP_type>
The Packet Data Protocol (PDP) type is a string parameter which specifies the type of packet data protocol:
• "IP" (default value): Internet Protocol (IETF STD 5)
• "NONIP": Non IP
• "IPV4V6": virtual <PDP_type> introduced to handle dual IP stack UE capability (see the 3GPP TS 24.301 [
])
• "IPV6": Internet Protocol, version 6 (see RFC 2460)
SARA-R404M / SARA-R410M-01B / SARA-R410M-02B
<PDP_type>="NONIP" is not supported.
1
The maximum number of active PDP contexts may be limited by the MNO