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 OTU1?

An OTU1 carries 1,008 E1s, per ITU-T G.709 and ITU-T G.707. This path maps STM-16 into ODU1 as a client, then follows that client's tributaries.

1,008

E1s in an OTU1

Working

OTU1 → 1 × ODU1 → 1 × STM-16 → 16 × STM-1 → 63 × E1

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.
63 × E1 in each STM-1 ITU-T G.70763 VC-12 tributaries: 3 TUG-3 × 7 TUG-2 × 3 TU-12.

1 ODU1
1 × 1 = 1 STM-16
1 × 1 × 16 = 16 STM-1s
1 × 1 × 16 × 63 = 1,008 E1s

Leftover capacity

601.673143 Mbit/s of each OTU1 line rate (2.666057143 Gbit/s) sits outside 1,008 × 2.048 Mbit/s of E1 line rate (2.064384 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 1,301.78, which floors to 1,301 E1s by bit rate only. The standard mapping is 1,008. Use the mapping.

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