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 E3s are in a STM-4?
A STM-4 carries 12 E3s, per ITU-T G.707.
12
E3s in a STM-4
Working
STM-4 → 4 × STM-1 → 3 × E3
- 4 × STM-1 in each STM-4 ITU-T G.7074 × STM-1.
- 3 × E3 in each STM-1 ITU-T G.707Three VC-3s, each carrying an E3.
- 4 STM-1s
- 4 × 3 = 12 E3s
Leftover capacity
209.664 Mbit/s of each STM-4 line rate (622.080 Mbit/s) sits outside 12 × 34.368 Mbit/s of E3 line rate (412.416 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 18.1, which floors to 18 E3s by bit rate only. The standard mapping is 12. Use the mapping.
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