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 DS3s are in an OTU1?
An OTU1 carries 48 DS3s, per ITU-T G.709 and ITU-T G.707. This path maps STM-16 into ODU1 as a client, then follows that client's tributaries.
48
DS3s in an OTU1
Working
OTU1 → 1 × ODU1 → 1 × STM-16 → 16 × STM-1 → 3 × DS3
- 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 × STM-16 in each ODU1 ITU-T G.709Client mappingCBR STM-16 mapped into OPU1.
- 16 × STM-1 in each STM-16 ITU-T G.70716 × STM-1.
- 3 × DS3 in each STM-1 ITU-T G.707Three VC-3s, each able to carry a DS3.
- 1 ODU1
- 1 × 1 = 1 STM-16
- 1 × 1 × 16 = 16 STM-1s
- 1 × 1 × 16 × 3 = 48 DS3s
Leftover capacity
518.729143 Mbit/s of each OTU1 line rate (2.666057143 Gbit/s) sits outside 48 × 44.736 Mbit/s of DS3 line rate (2.147328 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 59.59, which floors to 59 DS3s by bit rate only. The standard mapping is 48. Use the mapping.
Share this result. Pairing page