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 OC-1s are in an ODU3?

An ODU3 carries 768 OC-1s, per ITU-T G.709 and Telcordia GR-253. This path maps OC-768 into ODU3 as a client, then follows that client's tributaries.

768

OC-1s in an ODU3

Working

ODU3 → 1 × OC-768 → 768 × OC-1 (STS-1)

1 × OC-768 in each ODU3 ITU-T G.709Client mappingCBR OC-768, the same client rate as STM-256, mapped into OPU3.
768 × OC-1 (STS-1) in each OC-768 Telcordia GR-253768 × OC-1 (STS-1). Channelized OC-768 is 768 STS-1s.

1 OC-768
1 × 768 = 768 OC-1s

Leftover capacity

506.098983 Mbit/s of each ODU3 line rate (40.319218983 Gbit/s) sits outside 768 × 51.840 Mbit/s of OC-1 line rate (39.813120 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 777.76, which floors to 777 OC-1s by bit rate only. The standard mapping is 768. Use the mapping.

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