Result: standard mapping
How many OC-48s are in an OTU1?
An OTU1 carries 1 OC-48, per ITU-T G.709. This is a client mapping of OC-48 into ODU1.
1
OC-48 in an OTU1
Working
OTU1 → 1 × ODU1 → 1 × OC-48
- 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 × OC-48 in each ODU1 ITU-T G.709Client mappingCBR OC-48, the same client rate as STM-16, mapped into OPU1.
- 1 ODU1
- 1 × 1 = 1 OC-48
Leftover capacity
177.737143 Mbit/s of each OTU1 line rate (2.666057143 Gbit/s) sits outside 1 × 2.488320 Gbit/s of OC-48 line rate (2.488320 Gbit/s). That remainder is overhead, fixed stuff or justification. It is not another whole tributary.