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 OC-12s are in an OTU3?
An OTU3 carries 64 OC-12s, per ITU-T G.709 and Telcordia GR-253. This path maps OC-768 into ODU3 as a client, then follows that client's tributaries.
64
OC-12s in an OTU3
Working
OTU3 → 1 × ODU3 → 1 × OC-768 → 64 × OC-12
- 1 × ODU3 in each OTU3 ITU-T G.709The OTU3 frame carries exactly one ODU3.
- 1 × OC-768 in each ODU3 ITU-T G.709Client mappingCBR OC-768, the same client rate as STM-256, mapped into OPU3.
- 64 × OC-12 in each OC-768 Telcordia GR-25364 × OC-12. Channelized OC-768 is 768 STS-1s.
- 1 ODU3
- 1 × 1 = 1 OC-768
- 1 × 1 × 64 = 64 OC-12s
Leftover capacity
3.205293559 Gbit/s of each OTU3 line rate (43.018413559 Gbit/s) sits outside 64 × 622.080 Mbit/s of OC-12 line rate (39.813120 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 69.15, which floors to 69 OC-12s by bit rate only. The standard mapping is 64. Use the mapping.
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