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 E1s are in an ODU3?
An ODU3 carries 16,128 E1s, per ITU-T G.709 and ITU-T G.707. This path maps STM-256 into ODU3 as a client, then follows that client's tributaries.
16,128
E1s in an ODU3
Working
ODU3 → 1 × STM-256 → 256 × STM-1 → 63 × E1
- 1 × STM-256 in each ODU3 ITU-T G.709Client mappingCBR STM-256 mapped into OPU3.
- 256 × STM-1 in each STM-256 ITU-T G.707256 × STM-1.
- 63 × E1 in each STM-1 ITU-T G.70763 VC-12 tributaries: 3 TUG-3 × 7 TUG-2 × 3 TU-12.
- 1 STM-256
- 1 × 256 = 256 STM-1s
- 1 × 256 × 63 = 16,128 E1s
Leftover capacity
7.289074983 Gbit/s of each ODU3 line rate (40.319218983 Gbit/s) sits outside 16,128 × 2.048 Mbit/s of E1 line rate (33.030144 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 19,687.11, which floors to 19,687 E1s by bit rate only. The standard mapping is 16,128. Use the mapping.
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