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Transport aspects 2

Figure 15-11  Multiframe alignment signal overhead

Individual OTU/ODU overhead signals may use this central multiframe to lock their 2-frame, 4-frame, 8-
frame, 16-frame, 32-frame, etc., multiframes to the principal frame.

NOTE 1 – The 80-frame OPU4 multiframe cannot be supported. A dedicated 80-frame OPU4 multiframe indicator
(OMFI) is used instead.
NOTE 2 – The 20-frame OPUCn multiframe cannot be supported by MFAS. A dedicated 20-frame OPUCn multiframe
indicator (OMFI) is used instead.

15.7 OTU OH description
15.7.1 OTU overhead location
The OTU overhead location is shown in Figures 15-12 and 15-13.

The OTUk contains one instance of OTU overhead. The OTUCn contains n instances of OTU overhead,
numbered 1 to n (OTU OH #1 to OTU OH #n).

Figure 15-12  OTU overhead

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