Result: standard mapping
How many OC-48s are in an ODU3?
An ODU3 carries 16 OC-48s, 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.
16
OC-48s in an ODU3
Working
ODU3 → 1 × OC-768 → 16 × OC-48
- 1 × OC-768 in each ODU3 ITU-T G.709Client mappingCBR OC-768, the same client rate as STM-256, mapped into OPU3.
- 16 × OC-48 in each OC-768 Telcordia GR-25316 × OC-48. Channelized OC-768 is 768 STS-1s.
- 1 OC-768
- 1 × 16 = 16 OC-48s
Leftover capacity
506.098983 Mbit/s of each ODU3 line rate (40.319218983 Gbit/s) sits outside 16 × 2.488320 Gbit/s of OC-48 line rate (39.813120 Gbit/s). That remainder is overhead, fixed stuff or justification. It is not another whole tributary.