Page 1129 - 5G Basics - Core Network Aspects

Transport aspects 2

Figure 12-4 – ODUflex clock generation for IMP mapped packet client signals

13 Optical payload unit (OPU)
The OPU frame structure is shown in Figure 13-1. It is organized in an octet-based block frame structure
with four rows and 3810 columns.
The OPUk (k=0,1,2,2e,3,4,flex) frame structure contains one instance of the OPU frame structure. The
OPUCn frame structure contains n frame and multi-frame synchronous instances of the OPU frame
structure, numbered 1 to n (OPU #1 to OPU #n).

Column #
15 16 17 ....... 3824
1
Row # 2 3 OPUk overhead area OPUk payload area
(4 3808 bytes)
4
G.709-Y.1331(12)_F13-1

Figure 13-1  OPU frame structure

The two main areas of the OPU frame are:
– OPU overhead area;
– OPU payload area.

Columns 15 to 16 of the OPU are dedicated to an OPU overhead area.
Columns 17 to 3824 of the OPU are dedicated to an OPU payload area.
NOTE – OPU column numbers are derived from the OPU columns in the ODU frame.

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