Evolution of Current Telecommunication Networks and Next Generation Optical Networks

Between 1995 and 2000 has passed IP and ATM competion. MPLS that  approved by IETF in 1997, is ending to this competion with combination of best properties of IP  and ATM. MPLmS that equivalent of MPLS in optical network, designed in 1999.  Afterwards GMPLS that new version of MPLmS, was devoloped in 2000 by IETF.  Roting and signaling protocol that is supported by MPLS, are extending for support GMPLS.  GMPLS is a multi-plotform control plane tecnology to support not only devices that perform packet switching but also devices that perform TDM and Lambda switching. The explosion in high speed data demand and more bandwidth requirement caused the evolution of the current transport networks. And this brought the IP over WDM networks which integrate the traditional WDM networks which have bandwidths of terabits and IP networks which all applications run on. This article gives information on the MPLS, MPLmS and GMPLS network architectures which started to work on network backbones as a result of the evolution of telecommunications networks and new generation IP over WDM networks.

Despite the fact that IP came into existence as a Universal Convergence layer in the traditional evolution of data networks, current data networks still has the four layered structure [2]. Today’s data Networks typically have four layers: IP for carrying applications and services, asynchronous transfer mode (ATM) for traffic engineering, SONET/SDH for transport, and dense wavelength-division multiplexing (DWDM) for capacity.

This architecture has been slow to scale for very large volumes of traffic, and at the same time fairly cost-ineffective. Multilayer architectures typically suffer from the lowest common denominator effect where any one layer can limit the scalability of the entire network, as well as add to the cost of the entire network.

This multi-layered architecture has sacalability, cost and effective manageability problems in the case of exponentially growing traffic. The necessity to repeat the refinements of one layer for all of the layers, which is summarized as “least common multiple” effect, forces the service providers to invest continuously. The industry tends to pass from multi layered network architectures to the cost-effective and simplified solutions (IP/Optic) keeping especially the “traffic engineering” and “quality of service” properties [3].

Makalenin devamı için Dr. Cebrail Taşkın ile irtibata geçiniz.