SONET/SDH Data Rates
| SONET Optical Carrier level | SONET frame format | SDH level and frame format | Payload bandwidth (kbit/s) | Line rate (kbit/s) |
| OC-1 | STS-1 | STM-0 | 50,112 | 51,840 |
| OC-3 | STS-3 | STM-1 | 150,336 | 155,520 |
| OC-12 | STS-12 | STM-4 | 601,344 | 622,080 |
| OC-24 | STS-24 | – | 1,202,688 | 1,244,160 |
| OC-48 | STS-48 | STM-16 | 2,405,376 | 2,488,320 |
| OC-192 | STS-192 | STM-64 | 9,621,504 | 9,953,280 |
| OC-768 | STS-768 | STM-256 | 38,486,016 | 39,813,120 |
User throughput must also deduct path overhead from the payload bandwidth, but path-overhead bandwidth is variable based on the types of cross-connects built across the optical system.
Note that the data-rate progression starts at 155 Mbit/s and increases by multiples of four. The only exception is OC-24, which is standardized in ANSI T1.105, but not a SDH standard rate in ITU-T G.707. Other rates, such as OC-9, OC-18, OC-36, OC-96, and OC-1536, are defined but not commonly deployed; most are considered orphaned rates.
The next rate level of 160 Gbit/s OC-3072/STM-1024 has not yet been standardized, due to the cost of high-rate transceivers and the ability to more cheaply multiplex wavelengths at 10 and 40 Gbit/s.
Read more about this topic: Synchronous Optical Networking
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