SS7 Configuration, General, Trunks, Link sets

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 0-214, 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.