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 E1s are in a STM-16?

A STM-16 carries 1,008 E1s, per ITU-T G.707.

1,008

E1s in a STM-16

Working

STM-16 → 16 × STM-1 → 63 × E1

16 × STM-1 in each STM-16 ITU-T G.70716 × STM-1.
63 × E1 in each STM-1 ITU-T G.70763 VC-12 tributaries: 3 TUG-3 × 7 TUG-2 × 3 TU-12.

16 STM-1s
16 × 63 = 1,008 E1s

Leftover capacity

423.936 Mbit/s of each STM-16 line rate (2.488320 Gbit/s) sits outside 1,008 × 2.048 Mbit/s of E1 line rate (2.064384 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 1,215, which floors to 1,215 E1s by bit rate only. The standard mapping is 1,008. Use the mapping.

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