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-16s are in an OTU4?
An OTU4 carries 40 STM-16s, per ITU-T G.709. This is a client mapping of STM-16 into ODU1.
40
STM-16s in an OTU4
Working
OTU4 → 1 × ODU4 → 40 × ODU1 → 1 × STM-16
- 1 × ODU4 in each OTU4 ITU-T G.709The OTU4 frame carries exactly one ODU4.
- 40 × ODU1 in each ODU4 ITU-T G.70940 ODU1s, two slots each.
- 1 × STM-16 in each ODU1 ITU-T G.709Client mappingCBR STM-16 mapped into OPU1.
- 1 ODU4
- 1 × 40 = 40 ODU1s
- 1 × 40 × 1 = 40 STM-16s
Leftover capacity
12.277173568 Gbit/s of each OTU4 line rate (111.809973568 Gbit/s) sits outside 40 × 2.488320 Gbit/s of STM-16 line rate (99.532800 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 44.93, which floors to 44 STM-16s by bit rate only. The standard mapping is 40. Use the mapping.
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