Editing Synchronous optical networking (section)

==SONET/SDH data rates==
<!---
 -- ATTENTION:
 -- The numbers in this table are in kbit/s.
 -- Please do not change the units to Mbit/s.
 -- Per http://en.wikipedia.org/wiki/MOS:NUM#Large_numbers
 -- numbers in Wikipedia use commas to break the sequence every three places left of the decimal point
--->

{| class="wikitable" style="font-size:95%;"
|+ '''SONET/SDH Designations and bandwidths'''
|-
! SONET Optical Carrier level
! SONET frame format
! SDH level and frame format
! Payload bandwidth<ref group=nb>line rate minus the bandwidth of the line and section overheads</ref> ([[Kilobit per second|kbit/s]])
! Line rate (kbit/s)<!-- Please leave these units as kbps; see above note -->
|-
| [[Optical Carrier transmission rates#OC-1|OC-1]]
| STS-1
| STM-0
| align=right |50,112
| align=right |51,840
|-
| [[OC-3]]
| STS-3
| STM-1
| align=right |150,336
| align=right |155,520
|-
| [[OC-12]]
| STS-12
| STM-4
| align=right |601,344
| align=right |622,080
|-
| [[OC-24]]
| STS-24
| –  <!-- STM-8 does not exist  -->
| align=right |1,202,688
| align=right |1,244,160
|-
| [[OC-48]]
| STS-48
| STM-16
| align=right |2,405,376
| align=right |2,488,320
|-
| [[OC-192]]
| STS-192
| STM-64
| align=right |9,621,504
| align=right |9,953,280
|-
| [[OC-768]]
| STS-768
| STM-256
| align=right |38,486,016
| align=right |39,813,120
|}

User throughput must not 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&nbsp;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.<ref name="G.707"/><ref name="ANSI-T1.105"/> 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.<ref name="td-hdbk"/><ref name="broadcast"/><ref name="sat-intro"/>