Result: standard mapping
How many E3s are in an ODU1?
An ODU1 carries 48 E3s, per ITU-T G.709 and ITU-T G.707. This path maps STM-16 into ODU1 as a client, then follows that client's tributaries.
48
E3s in an ODU1
Working
ODU1 → 1 × STM-16 → 16 × STM-1 → 3 × E3
- 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.
- 1 STM-16
- 1 × 16 = 16 STM-1s
- 1 × 16 × 3 = 48 E3s
Leftover capacity
849.111126 Mbit/s of each ODU1 line rate (2.498775126 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 72.7, which floors to 72 E3s by bit rate only. The standard mapping is 48. Use the mapping.