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 a STM-64?

A STM-64 carries 192 DS3s, per ITU-T G.707.

192

DS3s in a STM-64

Working

STM-64 → 64 × STM-1 → 3 × DS3

64 × STM-1 in each STM-64 ITU-T G.70764 × STM-1.
3 × DS3 in each STM-1 ITU-T G.707Three VC-3s, each able to carry a DS3.

64 STM-1s
64 × 3 = 192 DS3s

Leftover capacity

1.363968 Gbit/s of each STM-64 line rate (9.953280 Gbit/s) sits outside 192 × 44.736 Mbit/s of DS3 line rate (8.589312 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 222.48, which floors to 222 DS3s by bit rate only. The standard mapping is 192. Use the mapping.

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