Result: standard mapping
How many E3s are in a STM-16?
A STM-16 carries 48 E3s, per ITU-T G.707.
48
E3s in a STM-16
Working
STM-16 → 16 × STM-1 → 3 × E3
- 16 × STM-1 in each STM-16 ITU-T G.70716 × STM-1.
- 3 × E3 in each STM-1 ITU-T G.707Three VC-3s, each carrying an E3.
- 16 STM-1s
- 16 × 3 = 48 E3s
Leftover capacity
838.656 Mbit/s of each STM-16 line rate (2.488320 Gbit/s) sits outside 48 × 34.368 Mbit/s of E3 line rate (1.649664 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 72.4, which floors to 72 E3s by bit rate only. The standard mapping is 48. Use the mapping.