Result: standard mapping
How many E2s are in a STM-16?
A STM-16 carries 192 E2s, per ITU-T G.707 and ITU-T G.702.
192
E2s in a STM-16
Working
STM-16 → 16 × STM-1 → 3 × E3 → 4 × E2
- 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.
- 4 × E2 in each E3 ITU-T G.702Four E2s.
- 16 STM-1s
- 16 × 3 = 48 E3s
- 16 × 3 × 4 = 192 E2s
Leftover capacity
866.304 Mbit/s of each STM-16 line rate (2.488320 Gbit/s) sits outside 192 × 8.448 Mbit/s of E2 line rate (1.622016 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 294.54, which floors to 294 E2s by bit rate only. The standard mapping is 192. Use the mapping.