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 E0s are in an OC-12?

An OC-12 carries 7,560 E0s, per Telcordia GR-253 and ITU-T G.704.

7,560

E0s in an OC-12

Working

OC-12 → 12 × OC-1 (STS-1) → 21 × E1 → 30 × E0

12 × OC-1 (STS-1) in each OC-12 Telcordia GR-25312 × OC-1 (STS-1). Channelized OC-12 is 12 STS-1s.
21 × E1 in each OC-1 (STS-1) Telcordia GR-253Seven VT groups × three VT2 (E1).
30 × E0 in each E1 ITU-T G.70430 voice channels in 32 timeslots. TS0 is framing and TS16 is channel-associated signalling.

12 OC-1s
12 × 21 = 252 E1s
12 × 21 × 30 = 7,560 E0s

Leftover capacity

138.240 Mbit/s of each OC-12 line rate (622.080 Mbit/s) sits outside 7,560 × 64 kbit/s of E0 line rate (483.840 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 9,720, which floors to 9,720 E0s by bit rate only. The standard mapping is 7,560. Use the mapping.

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