Synchronous Optical Networking - SONET/SDH Data Rates

SONET/SDH Data Rates

SONET/SDH Designations and bandwidths
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.

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