Quantity is how many containers you have. The result is how many tributaries fit, the path, and the leftover line rate. The choices stay in the URL, so you can share them.
Result: standard mapping
How many STM-256s are in an ODU4?
An ODU4 carries 2 STM-256s, per ITU-T G.709. This is a client mapping of STM-256 into ODU3.
2
STM-256s in an ODU4
Working
ODU4 → 2 × ODU3 → 1 × STM-256
- 2 × ODU3 in each ODU4 ITU-T G.709Each ODU3 takes 31 of the 80 ODU4 tributary slots, so 2 fit and 18 slots stay unused.
- 1 × STM-256 in each ODU3 ITU-T G.709Client mappingCBR STM-256 mapped into OPU3.
- 2 ODU3s
- 2 × 1 = 2 STM-256s
Leftover capacity
25.168205815 Gbit/s of each ODU4 line rate (104.794445815 Gbit/s) sits outside 2 × 39.813120 Gbit/s of STM-256 line rate (79.626240 Gbit/s). That remainder is overhead, fixed stuff or justification. It is not another whole tributary.
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