Result: standard mapping
How many STM-4s are in an ODU0?
An ODU0 carries 1 STM-4, per ITU-T G.709. This is a client mapping of STM-4 into ODU0.
1
STM-4 in an ODU0
Working
ODU0 → 1 × STM-4
- 1 × STM-4 in each ODU0 ITU-T G.709Client mappingCBR STM-4 mapped into OPU0.
- 1 STM-4
Leftover capacity
622.080 Mbit/s of each ODU0 line rate (1.244160 Gbit/s) sits outside 1 × 622.080 Mbit/s of STM-4 line rate (622.080 Mbit/s). That remainder is overhead, fixed stuff or justification. It is not another whole tributary.
By bit rate only
Dividing the line rates gives 2, which floors to 2 STM-4s by bit rate only. The standard mapping is 1. Use the mapping.