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I SDN
3 8 B
The Satellite Terminal provides an ISDN interface to connect devices for circuit switched voice and data services.
It is a basic rate (also known as 2B+D) interface and uses the Euro ISDN protocol. Note that the Satellite Terminal
can only provide service for one 64 kbps B-channel at a time.
D
N
IALING AND
UMBERING
5 2 B
D
IALING
5 5 B
As the ISDN numbering system follows the same pattern as the normal telephone system, dialing is carried out in
exactly the same manner as making a normal telephone call. The subscriber number is used with the same
international and area codes as any other telephone network. Start the dialed number with 00 and terminate it
with a #.
M
-S
N
ULTI
UBSCRIBER
UMBERING
5 6 B
ISDN supports MSN, which is a facility whereby more than one telephone number can be allocated to an ISDN
line. The BGAN Satellite Terminal assigns different MSNs for voice, 3.1 kHz audio, and UDI and RDI devices. Each
incoming call will be directed to the appropriate MSN depending on the type of call. This allows proper routing of
incoming calls to the correct ISDN device (such as ISDN phone, data card, or fax).
P DP C
ONTEXT
3 9 B
A Packet Data Protocol (PDP) context defines connection aspects such as routing, QoS, security, and billing
between a mobile user terminal, such as the BGAN terminal, and a data network. PDP contexts are essential to
the General Packet Radio Service (GPRS) system, which is used by GSM and UMTS-based 3G networks worldwide
for transmitting data.
In order for a user to be able to transfer data across a network, a PDP context must be activated in the terminal
and associated core network. The procedure for this is as follows:
1.
After registration with the network, the user activates a PDP context using an application on the computer or
terminal, and requests sufficient radio resources (that is, power and bandwidth) to support the context
activation procedure.
2.
Once the resources are allocated, the Terminal sends the Activate PDP context request to the core network.
This request includes key information about the mobile user's PDP address (for example, an IP address), PDP
type (that is, static or dynamic address) the QoS requested for this context, the APN of the external network
to which connectivity is requested, the user's identity (IMSI) and any necessary IP configuration parameters
(for example, security settings).
3.
On receiving the Activate PDP Context message, the core network checks the user's subscription record to
establish whether the request is valid. If the request is valid, a virtual connection is established between the
terminal and the core network, and data transfer can then take place between the Terminal and the external
data network, within the scope of the current PDP context. The PDP context is stored in both the terminal
and the core network.
A single terminal may have multiple PDP contexts each with different QoS profiles. The primary PDP context is a
PDP context with default QoS profile attributes and is always activated first. All other PDP contexts with the same
PDP address are secondary PDP contexts. Secondary PDP contexts share the same PDP address and connect to
the same APN but may have different QoS profiles.
Hughes 9350 BGAN Terminal User Guide
(MSN)
35
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