Voice Over ATM

Abstract

Data networks have been an essential part of communication in the last century. Over recent years, telecommunications has been a fast-growing industry. The development of very fast, inexpensive microprocessors and special purpose switching chips, coupled with highly reliable fiber optic transmission systems, have made it possible to build economical, ubiquitous, high-speed packet-based data and voice networks. Similarly, the development of very fast, inexpensive digital signal processors has made it practical to digitize and compress voice and data signals into packets. The natural evolution of these two developments has been to combine digitized voice and data packets creating integrated data/voice networks. There are a several different types of wide area packet networks that can support integrated voice/data traffic, with varying degrees of success. The principal data network technologies in use today are xDSL, X.25, Frame Relay, ATM, and TCP/IP. The packet technologies - Frame Relay, ATM, and TCP/IP - are the principal networking techniques companies use today to build new wide area data networks. Today's W ANs are constructed using leased lines running these three technologies, and using public data network services based on them. By a substantial margin, Frame Relay and TCP/IP are used the most, both over leased lines and as public data servtces. As the telecommunication field is in the process of convergence where all the services, networks and technologies will be working on a same platform. That's the reason it was important to discuss some kind of product which provides this convergence platform. ATM provides the ability to groom individual channels from several fractional or underutilized El lines into a single, more densely occupied El, increasing bandwidth efficiency and decreasing leased line costs. It can also provide dynamic program rerouting for automatic backup switching and bandwidth reallocation. To prove the concept we are using Lucent's PSA.X ATM switch which provides multi service platform for DATA &Voice Networks.