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A telecommunications network is implemented to provide services to customers. The objective is to provide features that quickly meet the needs of customers to a high level of quality and at low cost. The basic foundation of a telecommunications network comprises transmission systems and exchanges. Transmission systems provide the ability to transfer speech and data. Exchanges are used to switch transmission links for calls, thus allowing customers to share transmission links. Signalling provides the ability to transfer information between customers and networks, within networks and between customers. Signalling is the life-blood, the vitalising influence, of a network. Signalling information Hows through a network to transform it from an inert aggregate of elements to a powerful medium providing services to customers. Signalling is the bond that makes a network a cohesive force. Signalling systems can be 'channel associated' or 'common channel'. In channel-associated signalling (CAS) systems, signalling capacity is dedicated for each traffic circuit. CAS systems are optimised for use in old-technology networks (e.g. using electromechanical exchanges). In common-channel signalling (CCS) systems, signalling capacity is provided in a common pool and the capacity is allocated dynamically as required. CCS systems are optimised for use in modern-technology networks (using software-control led exchanges). This book has concentrated on describing modern CCS systems.

Inspec keywords: telecommunication networks; telecommunication signalling; telecommunication traffic

Other keywords: transmission links; common-channel signalling; transmission systems; channel-associated signalling; customer services; telecommunications network; traffic circuit; CAS systems

Subjects: Telecommunication applications

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