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-3s are in an OTU2?
An OTU2 carries 64 OC-3s, per ITU-T G.709 and Telcordia GR-253. This path maps OC-192 into ODU2 as a client, then follows that client's tributaries.
64
OC-3s in an OTU2
Working
OTU2 → 1 × ODU2 → 1 × OC-192 → 64 × OC-3
- 1 × ODU2 in each OTU2 ITU-T G.709The OTU2 frame carries exactly one ODU2.
- 1 × OC-192 in each ODU2 ITU-T G.709Client mappingCBR OC-192, the same client rate as STM-64, mapped into OPU2.
- 64 × OC-3 in each OC-192 Telcordia GR-25364 × OC-3. Channelized OC-192 is 192 STS-1s.
- 1 ODU2
- 1 × 1 = 1 OC-192
- 1 × 1 × 64 = 64 OC-3s
Leftover capacity
755.945316 Mbit/s of each OTU2 line rate (10.709225316 Gbit/s) sits outside 64 × 155.520 Mbit/s of OC-3 line rate (9.953280 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 68.86, which floors to 68 OC-3s by bit rate only. The standard mapping is 64. Use the mapping.
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