The New Generation Carrier Network…
Viewing the super-high control overhead of the ATM layer, i.e., each ATM cell has a 10% of control overhead, which wastes the network capacity greatly, it is attractive and reasonable to remove such a layer to directly transport IP traffic over SDH/SONET layer. This technique is called IP over SDH/SONET. Nonetheless, the removal of the ATM layer can lose some functionalities as well, which for example include the support of quality of service, the function of establishing virtual paths or virtual circuits in the network. These lost functions need to be filled by some layer(s) either IP or MPLS layer. According to today’s network technique, it seems that MPLS layer has taken over all the functionalities that were supported by the ATM layer. Also, current dominating network traffic is IP data traffic, while the SDH/SONET is a network layer that was designed to specifically support the past voice traffic, which has a strict constraint on time delay, so it seems also not necessary for such a network layer to exist in the modern carrier network for efficiency. Thus, to further eliminate the SDH/SONET layer, another slimmer network layer architecture IP over WDM was introduced recently. In this layer architecture, the functionalities supported by the old SDH/SONET layer have to be shifted to other layers, either up to the MPLS layer or down to the optical layer. These functionalities mainly involve the network protection and restoration capability. Now this capability has been proposed to be realized by either the MPLS layer or the optical layer.Pages: 1 2 [3] 4 5
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