Service Implication of SDH

To maximize the advantages of SDH technology that can be achieved, it is necessary to consider the different layers that exist in a telecommunications network. There are two layers of network transport services on a multipurpose network, which provides a service SDH transport stream of bits that are transparent. This means that the transport network itself is not aware of the contents of the payload is carried from A to B (for example, whether a telecommunications line is carrying voice or data).
Applications of new customers and services with added value appears on the network layer services at a higher level and can take forms that are difficult to predict (such as multimedia applications). The bottom of the second layer of these services generally include networks of basic services and network-specific overlay network service. -service networks is an area of ​​evolution is more predictable. Networks of basic services include applications, voice, ISDN and mobile radio (mobile), such as GSM, given overlay networks for specific services (for example 64 kbps leased lines provided to customers the company / industry) . Patterns of growth in voice traffic (phone) are generally stable, but the services is growing rapidly as GSM in some cases require the development of the transport network overlay on top throughout and multipurpose tissue. Under normal conditions, the characteristics that it has become the nature of an existing network should have to make this overlay, which is more an exception than a necessity.
When a new service is introduced through a vast geographical area, it is certainly not necessary to double overlay networks to be designed and implemented. Proper network planning at the early stages of a project can guarantee that a network of multipurpose transport will initially be able to connect the majority of potential customers.
New services can also be associated with applications of the intelligent network (IN: Intelligent Network), data network or mobile network (mobile). Not like the layers of services, the evolution of transport network layer is rather difficult to predict, but generally can be characterized by overall growth conditions are slowly, with a phase which is periodic of rapid growth.