Result: standard mapping
How many STM-64s are in an ODU4?
An ODU4 carries 10 STM-64s, per ITU-T G.709. This is a client mapping of STM-64 into ODU2.
10
STM-64s in an ODU4
Working
ODU4 → 10 × ODU2 → 1 × STM-64
- 10 × ODU2 in each ODU4 ITU-T G.709Ten ODU2s use all 80 tributary slots, eight slots each.
- 1 × STM-64 in each ODU2 ITU-T G.709Client mappingCBR STM-64 mapped into OPU2.
- 10 ODU2s
- 10 × 1 = 10 STM-64s
Leftover capacity
5.261645815 Gbit/s of each ODU4 line rate (104.794445815 Gbit/s) sits outside 10 × 9.953280 Gbit/s of STM-64 line rate (99.532800 Gbit/s). That remainder is overhead, fixed stuff or justification. It is not another whole tributary.