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 DS1s are in an OTU1?

An OTU1 carries 1,344 DS1s, 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.

1,344

DS1s in an OTU1

Working

OTU1 → 1 × ODU1 → 1 × STM-16 → 16 × STM-1 → 84 × DS1

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.
84 × DS1 in each STM-1 ITU-T G.70784 VC-11 tributaries: 3 TUG-3 × 7 TUG-2 × 4 TU-11.

1 ODU1
1 × 1 = 1 STM-16
1 × 1 × 16 = 16 STM-1s
1 × 1 × 16 × 84 = 1,344 DS1s

Leftover capacity

590.921143 Mbit/s of each OTU1 line rate (2.666057143 Gbit/s) sits outside 1,344 × 1.544 Mbit/s of DS1 line rate (2.075136 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 1,726.72, which floors to 1,726 DS1s by bit rate only. The standard mapping is 1,344. Use the mapping.

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