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Optical Networks - _J_2 Adaptation Layers_172

Optical Networks - _J_2 Adaptation Layers_172 - J.2...

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J.2 Adaptation Layers 805 VPI = x, VCI = a VPI = y, VCI = a 0 1 2 3 4 VPI = x, VCI = c VPI = y, VCI = c (a) VCI = b VCI = d Incoming VPI Outgoing link Outgoing VPI x y 1 to 2 (b) Figure J.3 Use of ATM VPIs for simplifying cell-forwarding across a shared route segment. Virtual channels sharing a common route segment are assigned the same VPI values on the links of this segment, and routing within this segment is based on the smaller VPI field rather than on the VCI field. (a) The two virtual channels are assigned the same VPIs x and y, on the links 0–1 and 1–2, respectively. (b) The switching at node 1 is now based on the VPI field and thus results in a smaller table, enabling more efficient switching. the virtual channels. In the example of Figure J.3, the virtual path from node 0 to node 2 is treated as a logical link by the virtual channels. J.2 Adaptation Layers ATM uses fixed-size cells for transport, but applications using ATM either are con- tinuous media such as voice or video, or use variable (and large) packets like IP. In
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