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 OTU1?
An OTU1 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 OTU1
Working
OTU1 → 1 × ODU1 → 1 × STM-16 → 16 × STM-1 → 3 × E3 → 4 × E2
- 1 × ODU1 in each OTU1 ITU-T G.709The OTU1 frame carries exactly one ODU1. The line-rate gap is OTU overhead and FEC.
- 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 ODU1
- 1 × 1 = 1 STM-16
- 1 × 1 × 16 = 16 STM-1s
- 1 × 1 × 16 × 3 = 48 E3s
- 1 × 1 × 16 × 3 × 4 = 192 E2s
Leftover capacity
1.044041143 Gbit/s of each OTU1 line rate (2.666057143 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 315.58, which floors to 315 E2s by bit rate only. The standard mapping is 192. Use the mapping.
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