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These new network elements carry all of the traditional T-carrier/PDH (Plesiochronous Digital Hierarchy) and SONET/SDH services, but also allow the transport of data services in their native format-Ethernet. For this reason, most network operators are integrating data services into their existing networks, and they are doing so by using the next generation of Synchronous Optical Network/Synchronous Digital Hierarchy (SONET/SDH) network elements. The biggest disadvantage of this approach, and for most of the other options, is the large amount of capital investment required. For example, one option is to build an entirely new data-only network.
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There are several options for dealing with this increase in data traffic, and each approach has advantages and disadvantages. But as the amount of data traffic in the network continues to grow, other means have to be found to carry the new traffic that are more bandwidth-efficient, less complex, and less costly. Until recently, this network served its purpose well and it is only with the huge increase in the need for data transport-driven mostly by the Internet, that there has been any real need for change.ĭata traffic has typically been carried on the telecommunications network by making it "look" like voice traffic, either by using a modem or, for higher-bandwidth connections, by packaging the data in such a way that it would fit into the standard 56/64-kbits/sec channel structure of the telecom network. The telephony network is the biggest machine in the world, with many millions of interconnections. The networks that have since been built around the world, however, were designed to carry only one type of traffic-voice. In fact, the very first telecommunications systems could only transmit "data," in the form of Morse code.
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The need to transmit data on telecommunications networks is not new.