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ISDN
The Satellite Terminal provides an ISDN (Integrated Services Digital Network) 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 64Kbps B-channel at a time.
D
N
IALING AND
UMBERING
D
IALING
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.
M
-S
N
ULTI
UBSCRIBER
UMBERING
ISDN supports Multi-Subscriber Numbering (MSN). MSN 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, 3.1KHz Audio, 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 (e.g. ISDN phone, data card or Fax).
PDP C
ONTEXT
A Packet Data Protocol (PDP) Context defines connection aspects such as routing, Quality of
Service (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:
8. 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.
9. 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).
10. 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)
33
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