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 ODU1?
An ODU1 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 ODU1
Working
ODU1 → 1 × STM-16 → 16 × STM-1 → 1 × E4
- 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 STM-16
- 1 × 16 = 16 STM-1s
- 1 × 16 × 1 = 16 E4s
Leftover capacity
270.551126 Mbit/s of each ODU1 line rate (2.498775126 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 17.94, which floors to 17 E4s by bit rate only. The standard mapping is 16. Use the mapping.
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