SDH Layers

SDH has four optical interface layers, which are depicted in Figure 6-2 and are as follows:

  • Path layer

  • Multiplex section layer

  • Regenerator section layer

  • Photonic layer

Figure 6-2. SDH Layers
[View full size image]

Path Layer

The path is a logical connection between the point at which the standard SDH frame format for the signal at a given rate is assembled and the point at which the standard SDH frame format for the signal is disassembled. The path overhead (POH) is first on, last off, so the alarm and error information contained within this layer represents end-to-end status. The POH is added or stripped at this layer.

Path-Terminating ...

Get Optical Network Design and Implementation now with the O’Reilly learning platform.

O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.

Start your free trial