Optical channel data unit (ODUk)
ODUk frame structure
The ODUk (k = 1,2,3) frame structure is shown in Figure 12-1. It is orga 646i82g nized in an octet-based
block frame structure with four rows and 3824 columns.
ITU-T Rec. G.709/Y.1331 (03/2003)
Column #
15
OPUk area
ODUk overhead 3810 bytes)
area
Area reserved for FA and OTUk overhead.
Figure 12-1/G.709/Y.1331 ODUk frame structure
G.709/Y.1331_F12-1
The two main areas of the ODUk frame are:
ODUk overhead area;
OPUk area.
Columns 1 to 14 of the ODUk are dedicated to ODUk overhead area.
NOTE - Columns 1 to 14 of row 1 are reserved for frame alignment and OTUk specific overhead.
Columns 15 to 3824 of the ODUk are dedicated to OPUk area.
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