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TANDBERG 3G Gateway User Manual
5.2 SS7 Configuration
To configure the Signaling System 7 (SS7 signaling) of the ISDN SS7 trunks click the ‘SS7’ link of
the ‘System configuration’ tab, as depicted in the figure below.
General
• Originating Point Code (OPC). A number between 0-2
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, which uniquely identifies a
signaling point, in this case the 3G Gateway, within a telephone network. This number
consists of three parts, i.e. 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.
• 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 analog signal for digitizing. The µ-law
algorithm is similar to a-law and used in North American and Japanese systems.
Trunks
A maximum of four PRI’s 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 signaling 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 sets
A link is a time slot within a trunk used for signaling. Link sets are typically used for signaling fail-
over purposes to one switch.
• Enabled. Checking this box enables at least one signaling link in a link set.
• Destination Point Code. Uniquely identifies the destination signaling point of the link.
This can differ from the DPC of the trunk, e.g. the DPC of a Signaling Transfer Point
(STP), see example 2 below.
o Enabled. Link1 is checked by default. Whereas, a second link box can be
checked to define an extra signaling link for fail-over purposes.
o Trunk. Number of the trunk (1 - 4) in which a time slot is reserved for signaling.
o Time slot. Number of the time slot, within aforementioned trunk, reserved for
signaling.
o SLC. A Signaling Link Code is a unique link number provided by the network
operator to identify a link.
Routes
Routes are typically used for signaling fail-over purposes via multiple switches.
• Destination Point Code. Unique identifier indicating the destination signaling point of a
trunk.
• Priority. Priority level of the route to the destination signaling point. Fail-over signaling
paths will be followed according to this priority.
• Link set. Indicates the link to the destination signaling point according to the above
mentioned priority setting. When set to off the respective route is disabled.
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