TANDBERG D13841.08 SS7 Configuration - Example, TANDBERG 3GGatewayateway, Configuring, 3G Gateway

SS7 Configuration – Example 1

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TANDBERG 3GGatewayateway

Suppose all four SS7 trunks of one 3G

Gateway are connected to one switch, as

indicated in the connection schematic to the

right.

In this example the Originating Point Code

(OPC) of the 3G Gateway equals 99, and the

Destination Point Codes (DPCs) for all trunks

equal 100.

Both OPC and DPC are provided by the

telephone network operator.

These settings can be seen in the schematic

and in the screen shot of the SS7 window

below right. All trunks can carry a maximum

of 30 calls, i.e. 30 data time slots.

Each data time slot is identified uniquely by

its OPC, DPC and Circuit Identification Code

(CIC). The “absolute” CIC consist of a CIC

“base address”, which has to be defined

for each trunk in the SS7 window, i.e. in

this case 0, 32, 64 and 96, and a relative

address. The latter is a number between 0

and 31 and depends on the choice of the

framing time slot and signalling time-slot

numbers.

Since one time slot is reserved for framing,

in this case set to time slot 0 by default, and

one time slot has to be defined for signalling

(16 in this example), 30 time slots are left

to transport call related data, i.e. time slots

with relative addresses 1–15 and 17–31,

see the table in the schematic.

For signalling fail-over purposes a maximum

of 2 SS7 trunks, also called links, can be

defined to take care of the SS7 signalling of

all 4 trunks in the 3G Gateway,

In this case trunks 1 and 2 are used for SS7

signalling. Since there is a direct connection

between the 3G Gateway and the switch,

both links are defined in the same link set

with the DPC of the switch, i.e. 100. Since

fail-over has been arranged within one link

set, no routes can be defined.

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D13841.08

33

10.2007