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 STM-1s are in a STM-256?

A STM-256 carries 256 STM-1s, per ITU-T G.707.

256

STM-1s in a STM-256

Working

STM-256 → 256 × STM-1

256 × STM-1 in each STM-256 ITU-T G.707256 × STM-1.

256 STM-1s

Leftover capacity

0 bit/s of each STM-256 line rate (39.813120 Gbit/s) sits outside 256 × 155.520 Mbit/s of STM-1 line rate (39.813120 Gbit/s). That remainder is overhead, fixed stuff or justification. It is not another whole tributary.

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