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
Famous quotes containing the words data and/or rates:
“To write it, it took three months; to conceive it three minutes; to collect the data in it—all my life.”
—F. Scott Fitzgerald (1896–1940)
“In the U.S. for instance, the value of a homemaker’s productive work has been imputed mostly when she was maimed or killed and insurance companies and/or the courts had to calculate the amount to pay her family in damages. Even at that, the rates were mostly pink collar and the big number was attributed to the husband’s pain and suffering.”
—Gloria Steinem (20th century)