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Transport aspects 2
Figure 11-4 OTUCn frame structure
12 Optical data unit (ODU)
12.1 ODU frame structure
The ODU frame structure is shown in Figure 12-1. It is organized in an octet-based block frame structure
with four rows and 3824 columns.
The ODUk (k=0,1,2,2e,3,4,flex) frame structure contains one instance of the ODU frame structure. The
ODUCn frame structure contains n frame and multi-frame synchronous instances of the ODU frame
structures, numbered 1 to n (ODU #1 to ODU #n).
Figure 12-1 ODU frame structure
The two main areas of the ODU frame are:
– ODU overhead area
– OPU area.
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