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 ODU0?

An ODU0 carries 252 E1s, per ITU-T G.709 and ITU-T G.707. This path maps STM-4 into ODU0 as a client, then follows that client's tributaries.

252

E1s in an ODU0

Working

ODU0 → 1 × STM-4 → 4 × STM-1 → 63 × E1

1 × STM-4 in each ODU0 ITU-T G.709Client mappingCBR STM-4 mapped into OPU0.
4 × STM-1 in each STM-4 ITU-T G.7074 × 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-4
1 × 4 = 4 STM-1s
1 × 4 × 63 = 252 E1s

Leftover capacity

728.064 Mbit/s of each ODU0 line rate (1.244160 Gbit/s) sits outside 252 × 2.048 Mbit/s of E1 line rate (516.096 Mbit/s). That remainder is overhead, fixed stuff or justification. It is not another whole tributary.

By bit rate only

Dividing the line rates gives 607.5, which floors to 607 E1s by bit rate only. The standard mapping is 252. Use the mapping.

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