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 E2s are in a STM-1?
A STM-1 carries 12 E2s, per ITU-T G.707 and ITU-T G.702.
12
E2s in a STM-1
Working
STM-1 → 3 × E3 → 4 × E2
- 3 × E3 in each STM-1 ITU-T G.707Three VC-3s, each carrying an E3.
- 4 × E2 in each E3 ITU-T G.702Four E2s.
- 3 E3s
- 3 × 4 = 12 E2s
Leftover capacity
54.144 Mbit/s of each STM-1 line rate (155.520 Mbit/s) sits outside 12 × 8.448 Mbit/s of E2 line rate (101.376 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 18.4, which floors to 18 E2s by bit rate only. The standard mapping is 12. Use the mapping.
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