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-0?
A STM-0 carries 21 E1s, per ITU-T G.707.
21
E1s in a STM-0
Working
STM-0 → 21 × E1
- 21 × E1 in each STM-0 ITU-T G.707One VC-3 holds 7 TUG-2 × 3 TU-12 (E1).
- 21 E1s
Leftover capacity
8.832 Mbit/s of each STM-0 line rate (51.840 Mbit/s) sits outside 21 × 2.048 Mbit/s of E1 line rate (43.008 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 25.31, which floors to 25 E1s by bit rate only. The standard mapping is 21. Use the mapping.
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