Theories and applications of synchronous digital hierarchy systems

The evolution of networks in telecommunications has brought on the importance of communication technologies to obtain high performance transportation networks. Nowadays, The Synchronous Digital Hierarchy multiplex technology is generally well suitable for the optical communications network solution in utility public communication systems. Highly standardized Scynchronous Digital Hierarchy defines for modern multiplexer technology, though it provides support for investments and protocols as well. Integrated management features make Scynchronous Digital Hierarchy networks very reliable, which ensure fast and high availability times, as well as quick reconfiguration in faults. In this thesis, we evaluated the Bit Error Rate (BER) performances of Synchronous Digital Hierarchy System with an interconnected multi ring architecture overlaid over an optical mesh network. Firstly, we tested the Bit Error Rate (BER) in the introduced path over the real Synchronous Digital Hierarchy System onto a digital transmission center in Türk Telekom İzmir. In the second part of the study the whole Scynchronous Digital Hierarchy Communication System is computer simulated and than the Bit Error Rate (BER) of the System is determinated. It is shown that the simulation results are very close to the evaluated test results.