signalling point, in this case the 3G Gateway,
within a telephone network. This number
consists of three parts, viz. a network,
cluster and member number, and will be
provided by the network operator.

Network indicator

•

. A two bit data field

within the Service Information Octet of
the Message Signal Unit that permits
discrimination between national and
international messages.

Audio Codec / Law

•

. Either ALAW or ULAW. An

a-law algorithm is a standard companding, i.e.
compressing and expanding, algorithm, used
in European digital communication systems
to optimize, i.e. modify, the dynamic range
of an analogue signal for digitizing. The µ-law
algorithm is similar to a-law and used in North
American and Japanese systems.

SS7 Configuration

Trunks

A maximum of four PRIs or SS7 trunks, i.e.
cables carrying E1/T1, can be enabled in the 3G
Gateway.

Mode

•

. Enable or disable a trunk.

Destination Point Code (DPC)

•

. Uniquely

identifies the destination signalling point of
the trunk. It will be provided by the network
operator.

CIC

•

. The Circuit Identification Code is a

unique identifier for a data time slot in
a cable (trunk). In this case the CIC acts
as base address and can be defined for
each SS7 trunk and sets the first time-slot
number of the respective SS7 trunk.

Link Set Details

A link is a time slot within a trunk
used for signalling. Link sets are
typically used for signalling fail-over
purposes to one switch.

Enabled

•

. Checking this box ena-

bles at least one signalling link in
a link set.

Destination Point Code

•

. Uniquely

identifies the destination signal-
ling point of the link. This can dif-
fer from the DPC of the trunk, e.g.
the DPC of a Signalling Transfer
Point (STP), see example 2 on the
following pages.

Enabled

•

. Link1 is checked by

default. Whereas, a second link
box can be checked to define
an extra signalling link for fail-
over purposes.

Trunk

•

. Number of the trunk

(1–4) in which a time slot is
reserved for signalling.

Time slot

•

. Number of the time

slot, within aforementioned
trunk, reserved for signalling.

SLC

•

. A Signalling Link Code is a

unique link number provided by
the network operator to identify
a link.

To provide a better understanding
of the settings discussed here, two
examples are given on the following
pages.

Routes

Routes are typically used for signalling fail-over
purposes via multiple switches.

Destination Point Code.

•

Unique identifier

indicating the destination signalling point of
a trunk.

Priority.

•

Priority level of the route to the

destination signalling point. Fail-over signalling
paths will be followed according to this priority.

Link set.

•

Indicates the link to the destination

signalling point according to the above
mentioned priority setting. When set to off
the respective route is disabled.