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 DS2s are in an OTU1?
An OTU1 carries 336 DS2s, 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.
336
DS2s in an OTU1
Working
OTU1 → 1 × ODU1 → 1 × OC-48 → 48 × OC-1 (STS-1) → 7 × DS2
- 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.
- 7 × DS2 in each OC-1 (STS-1) Telcordia GR-253Seven VT groups, one VT6 (DS2) each.
- 1 ODU1
- 1 × 1 = 1 OC-48
- 1 × 1 × 48 = 48 OC-1s
- 1 × 1 × 48 × 7 = 336 DS2s
Leftover capacity
545.225143 Mbit/s of each OTU1 line rate (2.666057143 Gbit/s) sits outside 336 × 6.312 Mbit/s of DS2 line rate (2.120832 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 422.37, which floors to 422 DS2s by bit rate only. The standard mapping is 336. Use the mapping.
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