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 OTU1?
An OTU1 carries 4 OC-12s, per ITU-T G.709 and Telcordia GR-253. This path maps OC-48 into ODU1 as a client, then follows that client's tributaries.
4
OC-12s in an OTU1
Working
OTU1 → 1 × ODU1 → 1 × OC-48 → 4 × OC-12
- 1 × ODU1 in each OTU1 ITU-T G.709The OTU1 frame carries exactly one ODU1. The line-rate gap is OTU overhead and FEC.
- 1 × OC-48 in each ODU1 ITU-T G.709Client mappingCBR OC-48, the same client rate as STM-16, mapped into OPU1.
- 4 × OC-12 in each OC-48 Telcordia GR-2534 × OC-12. Channelized OC-48 is 48 STS-1s.
- 1 ODU1
- 1 × 1 = 1 OC-48
- 1 × 1 × 4 = 4 OC-12s
Leftover capacity
177.737143 Mbit/s of each OTU1 line rate (2.666057143 Gbit/s) sits outside 4 × 622.080 Mbit/s of OC-12 line rate (2.488320 Gbit/s). That remainder is overhead, fixed stuff or justification. It is not another whole tributary.
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