Quantity is how many containers you have. The result is how many tributaries fit, the path, and the leftover line rate. The choices stay in the URL, so you can share them.
Result: standard mapping
How many E2s are in an OTU2?
An OTU2 carries 768 E2s, per ITU-T G.709, ITU-T G.707 and ITU-T G.702. This path maps STM-64 into ODU2 as a client, then follows that client's tributaries.
768
E2s in an OTU2
Working
OTU2 → 1 × ODU2 → 1 × STM-64 → 64 × STM-1 → 3 × E3 → 4 × E2
- 1 × ODU2 in each OTU2 ITU-T G.709The OTU2 frame carries exactly one ODU2.
- 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.
- 4 × E2 in each E3 ITU-T G.702Four E2s.
- 1 ODU2
- 1 × 1 = 1 STM-64
- 1 × 1 × 64 = 64 STM-1s
- 1 × 1 × 64 × 3 = 192 E3s
- 1 × 1 × 64 × 3 × 4 = 768 E2s
Leftover capacity
4.221161316 Gbit/s of each OTU2 line rate (10.709225316 Gbit/s) sits outside 768 × 8.448 Mbit/s of E2 line rate (6.488064 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 1,267.66, which floors to 1,267 E2s by bit rate only. The standard mapping is 768. Use the mapping.
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