Result: standard mapping
How many STM-64s are in an ODU3?
An ODU3 carries 4 STM-64s, per ITU-T G.709 and ITU-T G.707. This path maps STM-256 into ODU3 as a client, then follows that client's tributaries.
4
STM-64s in an ODU3
Working
ODU3 → 1 × STM-256 → 4 × STM-64
- 1 × STM-256 in each ODU3 ITU-T G.709Client mappingCBR STM-256 mapped into OPU3.
- 4 × STM-64 in each STM-256 ITU-T G.7074 × STM-64.
- 1 STM-256
- 1 × 4 = 4 STM-64s
Leftover capacity
506.098983 Mbit/s of each ODU3 line rate (40.319218983 Gbit/s) sits outside 4 × 9.953280 Gbit/s of STM-64 line rate (39.813120 Gbit/s). That remainder is overhead, fixed stuff or justification. It is not another whole tributary.