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-1s are in an OTU1?
An OTU1 carries 48 OC-1s, 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.
48
OC-1s in an OTU1
Working
OTU1 → 1 × ODU1 → 1 × OC-48 → 48 × OC-1 (STS-1)
- 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.
- 48 × OC-1 (STS-1) in each OC-48 Telcordia GR-25348 × OC-1 (STS-1). Channelized OC-48 is 48 STS-1s.
- 1 ODU1
- 1 × 1 = 1 OC-48
- 1 × 1 × 48 = 48 OC-1s
Leftover capacity
177.737143 Mbit/s of each OTU1 line rate (2.666057143 Gbit/s) sits outside 48 × 51.840 Mbit/s of OC-1 line rate (2.488320 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 51.42, which floors to 51 OC-1s by bit rate only. The standard mapping is 48. Use the mapping.
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