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Service Node
The Open Telecommunications Service Node, Open SN, is a cost effective means of introducing IN services into non-IN networks. It has the features of a full IN implementation in a single platform and connects to the network using normal call handling signalling.
The Open SN is different to most service nodes. It has been designed from the ground-up as an IN component. The Open SN functions are easily migrated to a full IN architecture - there is no need to re-implement services to provide higher capacity and a more distributed architecture.
All IN functions in a single platform
The Open SN incorporates all the functions of the Open SCP and the Open IP, and the call handling functions normally done by a Service Switching Point (SSP). The latter include:
IN call models for originating and terminating calls
Trigger detection and processing
Call gapping and service filtering
Production of call detail records (e.g. for billing)
Full IN call handling
The Open SN handles calls using the same powerful service logic and service data functions as the Open SCP enabling future migration to a full IN architecture.
Easy network connection
The Open SN connects to the network using the normal call handling protocol, the ISDN User Part (ISUP) available in the SS7 network. There is no need, then, to upgrade network switches to introduce IN; the existing protocols will suffice.
Moreover, by using “loop routes” it is possible for a single Open SN platform to serve many network switches. This reduces the implementation cost, both in terms of service node hardware and in transmission costs. Loop routes are also utilised by the Signalling Interface Processor , where they are explained more fully.

Reliable performance
All the functions of the Open SN are duplicated for reliability as in other OT IN products.
The Open SN has been designed for a moderate call load of 40 calls/s, which can be increased by installing multiple service node sites. For significantly higher loads, we expect that use of the Open SCP will be more efficient.
With a full range of OAM features
As with all OT products, the Open SCP is built for real telecom environments, with a full set of operation, administration and management features, including:
online loading of new services and new service versions
online management and backup of data, including voice prompts
all OAM functions accessible via a text command / response interface or via CORBA objects
extensive statistics
comprehensive alarm indications
diagnostic trace functions for call events
For further information on the Open SN or any other OT products please contact us at [solutions@ot.com.au].
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