Result: standard mapping
How many ODU2s are in an OTU3?
An OTU3 carries 4 ODU2s, per ITU-T G.709.
4
ODU2s in an OTU3
Working
OTU3 → 1 × ODU3 → 4 × ODU2
- 1 × ODU3 in each OTU3 ITU-T G.709The OTU3 frame carries exactly one ODU3.
- 4 × ODU2 in each ODU3 ITU-T G.709Four ODU2s fill the 32 tributary slots of 1.25 Gbit/s.
- 1 ODU3
- 1 × 4 = 4 ODU2s
Leftover capacity
2.869317863 Gbit/s of each OTU3 line rate (43.018413559 Gbit/s) sits outside 4 × 10.037273924 Gbit/s of ODU2 line rate (40.149095696 Gbit/s). That remainder is overhead, fixed stuff or justification. It is not another whole tributary.