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TANDBERG 3G Gateway User Manual
Save
When ready to store the new settings, press ‘Save’. These settings will take effect when the
system has been restarted.
Restart
This button will restart the 3G Gateway. Any changes made in the SS7 Configuration of the 3G
Gateway will take effect after the system has been restarted.
The following two examples will explain the above mentioned SS7 settings.
Example1
Suppose all 4 SS7 trunks of one 3G Gateway are connected to one switch, as indicated in the
connection schematic below. 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. 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 signaling 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 signaling (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 below.
In the 3G gateway for signaling fail-over purposes a maximum of 2 SS7 trunks, also called links,
can be defined to take care of the SS7 signaling of all 4 trunks. In this case trunks 1 and 2 are
used for SS7 signaling. Since, there exists 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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