Result: standard mapping
How many ODU2s are in an OTU4?
An OTU4 carries 10 ODU2s, per ITU-T G.709.
10
ODU2s in an OTU4
Working
OTU4 → 1 × ODU4 → 10 × ODU2
- 1 × ODU4 in each OTU4 ITU-T G.709The OTU4 frame carries exactly one ODU4.
- 10 × ODU2 in each ODU4 ITU-T G.709Ten ODU2s use all 80 tributary slots, eight slots each.
- 1 ODU4
- 1 × 10 = 10 ODU2s
Leftover capacity
11.437234328 Gbit/s of each OTU4 line rate (111.809973568 Gbit/s) sits outside 10 × 10.037273924 Gbit/s of ODU2 line rate (100.37273924 Gbit/s). That remainder is overhead, fixed stuff or justification. It is not another whole tributary.
By bit rate only
Dividing the line rates gives 11.13, which floors to 11 ODU2s by bit rate only. The standard mapping is 10. Use the mapping.