Result: standard mapping
How many E2s are in an ODU1?
An ODU1 carries 192 E2s, per ITU-T G.709, ITU-T G.707 and ITU-T G.702. This path maps STM-16 into ODU1 as a client, then follows that client's tributaries.
192
E2s in an ODU1
Working
ODU1 → 1 × STM-16 → 16 × STM-1 → 3 × E3 → 4 × E2
- 1 × STM-16 in each ODU1 ITU-T G.709Client mappingCBR STM-16 mapped into OPU1.
- 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.
- 1 STM-16
- 1 × 16 = 16 STM-1s
- 1 × 16 × 3 = 48 E3s
- 1 × 16 × 3 × 4 = 192 E2s
Leftover capacity
876.759126 Mbit/s of each ODU1 line rate (2.498775126 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 295.78, which floors to 295 E2s by bit rate only. The standard mapping is 192. Use the mapping.