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 ODU1?

An ODU1 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 ODU1

Working

ODU1 → 1 × OC-48 → 48 × OC-1 (STS-1) → 7 × DS2

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 OC-48
1 × 48 = 48 OC-1s
1 × 48 × 7 = 336 DS2s

Leftover capacity

377.943126 Mbit/s of each ODU1 line rate (2.498775126 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 395.87, which floors to 395 DS2s by bit rate only. The standard mapping is 336. Use the mapping.

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