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 OC-12?

An OC-12 carries 336 DS1s, per Telcordia GR-253.

336

DS1s in an OC-12

Working

OC-12 → 12 × OC-1 (STS-1) → 28 × DS1

12 × OC-1 (STS-1) in each OC-12 Telcordia GR-25312 × OC-1 (STS-1). Channelized OC-12 is 12 STS-1s.
28 × DS1 in each OC-1 (STS-1) Telcordia GR-253Seven VT groups × four VT1.5 (DS1).

12 OC-1s
12 × 28 = 336 DS1s

Leftover capacity

103.296 Mbit/s of each OC-12 line rate (622.080 Mbit/s) sits outside 336 × 1.544 Mbit/s of DS1 line rate (518.784 Mbit/s). That remainder is overhead, fixed stuff or justification. It is not another whole tributary.

By bit rate only

Dividing the line rates gives 402.9, which floors to 402 DS1s by bit rate only. The standard mapping is 336. Use the mapping.

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