How the call service is going? How subscriber can send SMS to their friend, family and partner? How you can access mobile broadband internet service through mobile phone or modem connected to laptop/computer? All telecommunication services mentioned above are running through telecommunication systems which installed by telecommunication companies. Telecommunication system responsible to handle telecommunication service requested by subscribers, process it and generate proper output. Telecommunication system is connected from one network element connect to another one. Any failure or disturbance to one or more network element of telecommunication system will interrupt the request of telecommunication system from subscriber. As the result, subscriber will fail to retrieve telecommunication services, either voice, SMS, mobile internet service or Value Added Service (VAS)
What are telecommunication systems which responsible to handle subscriber’s request?
1. Base Transceiver Station (BTS)
2. Base Station Controller (BSC)
3. Transmission media
4. Home Local Register (HLR)/Visitor Local Register (VST)
5. Mobile Switching Centre (MSC)
6. Intelligent Network (IN)
Telecommunication systems above are the core network element where any kind of telecommunication services will come and go through those network elements. The next level is depending on what kind of telecommunication service is requested by subscribers. Different telecommunication service will be served by different network element of telecommunication systems. The network elements which responsible to process the requests from subscriber are;
1. Short Messaging Service Centre (SMSC)
2. Public Data Service Node (PDSN), GGSN/GPRS
3. Application server
Application server is network element which responsible to handle services based on application service such as mobile internet service for billing purpose, Value Added Service (VAS). There could be many kinds of VAS service such as download contents, subscription service, Ring Back Tone (RBT) service etc. Therefore there will be a lot of application server on the telecommunication system and it will more and more. Telecommunication system should be installed with redundant system to make sure that the entire of telecommunication services are running well event though one or more network element of telecommunication systems are getting problems
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