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The development of technology makes all the fields trying to make their technology should also follow the development. Similarly, in fiber optic communication technology, developments in fiber optic communication technology is also growing rapidly.  Sonet test set is tool for analyzer NNI, those are importance to analyze fiber optic problem. Fiber optic communication is a method of transmitting information from one place to another by sending pulses of light through optical fibers. The light pulse forming transmission of electromagnetic waves that eventually modulated to carry information that had been sent earlier. On fiber optic technology was developed in 1970. In the development of fiber optic technology has transformed communication technology into fiber optic technology is very advanced. The development of optical fiber is accompanied by the development in the telecommunications industry and brings a very important role towards the development of communications technology until the present century. In developed countries, fiber-optic technology is more developed rapidly and has replaced the copper wire telecommunications through.

Synchronous Optical Network (SONET) and Synchronous Digital Hierarchy (SDH) is a standard protocol that has a fiber optic multiplexing system which has the function to transfer a digital bit stream through optical fiber using a diode laser or light emission diode (LED). Measurement of synchronous optical network is using the SONET test set. Waves of lower levels are also still able to be transferred via the electrical interface. The method has been developed through a hierarchical system technology plesiochronous (PDH) digital which aims to bring a large number of signals through telephone calls and through the traffic data obtained through fiber optic cables when there is no problem of synchronization signals.

Generic criteria can apply for SONET with other transmission systems such as fiber optic systems or can be asynchronous digital radio system. The main requirements of the generic criteria SONET technology is Telcordia generic requirements. SONET is a standard united state institution for a large number of synchronous data on fiber optic media. Equivalent to the standard SONET is SDH or synchronous digital hierarchy. Taken together standard, which is to ensure that the optical fiber network of the optical digital networks could interconnect as internationally. With optical media network system, the conventional network must take advantage the optical fiber through a channel that has been available.

To perform measurements on fiber optic networks, SONET test set is used. The tool used to analyze some of the errors that occurred for the network node interface (NNI) of a Synchronous Digital Hierarchy (SDH). Gauges SONET test set provides many functions and features are very useful to evaluate the error node optical fiber systems. The equipment company to develop the design and manufacturing development tools so it is suitable for evaluating the characteristics of a particular network using the interface used in SDH equipment. Transmitter and receiver will be stored in one frame and the optical interface (plug-in units) that have been provided.