Result: standard mapping
How many E3s are in an ODU2?
An ODU2 carries 192 E3s, per ITU-T G.709 and ITU-T G.707. This path maps STM-64 into ODU2 as a client, then follows that client's tributaries.
192
E3s in an ODU2
Working
ODU2 → 1 × STM-64 → 64 × STM-1 → 3 × E3
- 1 × STM-64 in each ODU2 ITU-T G.709Client mappingCBR STM-64 mapped into OPU2.
- 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.
- 1 STM-64
- 1 × 64 = 64 STM-1s
- 1 × 64 × 3 = 192 E3s
Leftover capacity
3.438617924 Gbit/s of each ODU2 line rate (10.037273924 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 292.05, which floors to 292 E3s by bit rate only. The standard mapping is 192. Use the mapping.