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 E4s are in an OTU1?
An OTU1 carries 16 E4s, per ITU-T G.709 and ITU-T G.707. This path maps STM-16 into ODU1; E4 into STM-1 as a client, then follows that client's tributaries.
16
E4s in an OTU1
Working
OTU1 → 1 × ODU1 → 1 × STM-16 → 16 × STM-1 → 1 × E4
- 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.
- 1 × E4 in each STM-1 ITU-T G.707Client mappingAsynchronous E4 mapped into the C-4 / VC-4. This client holds 64 E1s internally; the VC-12 tributary count of an STM-1 is 63.
- 1 ODU1
- 1 × 1 = 1 STM-16
- 1 × 1 × 16 = 16 STM-1s
- 1 × 1 × 16 × 1 = 16 E4s
Leftover capacity
437.833143 Mbit/s of each OTU1 line rate (2.666057143 Gbit/s) sits outside 16 × 139.264 Mbit/s of E4 line rate (2.228224 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 19.14, which floors to 19 E4s by bit rate only. The standard mapping is 16. Use the mapping.
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