Optical Networks - _J_2 Adaptation Layers_172

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

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
J.2 Adaptation Layers 805 VPI=x ,VCI=a VPI=y ,VCI=a 0 12 3 4 VPI=x ,VCI=c VPI=y ,VCI=c (a) VCI=b VCI=d Incoming VPI Outgoing link Outgoing VPI xy 1to2 (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
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 01/15/2011 for the course ECE 6543 taught by Professor Boussert during the Spring '09 term at Georgia Institute of Technology.

Ask a homework question - tutors are online