Result: standard mapping
How many E3s are in a STM-64?
A STM-64 carries 192 E3s, per ITU-T G.707.
192
E3s in a STM-64
Working
STM-64 → 64 × STM-1 → 3 × E3
- 64 × STM-1 in each STM-64 ITU-T G.70764 × STM-1.
- 3 × E3 in each STM-1 ITU-T G.707Three VC-3s, each carrying an E3.
- 64 STM-1s
- 64 × 3 = 192 E3s
Leftover capacity
3.354624 Gbit/s of each STM-64 line rate (9.953280 Gbit/s) sits outside 192 × 34.368 Mbit/s of E3 line rate (6.598656 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 289.6, which floors to 289 E3s by bit rate only. The standard mapping is 192. Use the mapping.