10.8.02    In searching for information regarding the overhead involved in SONET I found a lot of information in various places but nowhere did it sum up the actual payload bitrates for different SONET line rates.  I created an Excel spreadsheet to analyze the problem and converted it to html.  The result is below.  It shows that the concatenated rates become more efficient the faster the transfer rate due to the decrease in path overhead, although the theoretical max efficiency rate is 87/90 or 96.667% which OC-192c comes close to achieving.  I also realize that concatenated rates of STS-24, STS-36, and STS-96 are not utilized (see RFC 1619 ) but are merely there for the purpose of this excercise.




 SONET Overhead                    
  rate # of STS-1 frames SOH (section overhead LOH (line overhead) POH (path overhead) total OH total bytes per frame total payload payload % bandwidth utilized raw bitrate (Mbps) payload bitrate (Mbps)
non-concatenated STS-1/OC-1 1 9 18 9 36 810 774 95.556% 51.84 49.536
  STS-3/OC-3 3 27 54 27 108 2430 2322 95.556% 155.52 148.608
  STS-9/OC-9 9 81 162 81 324 7290 6966 95.556% 466.56 445.824
  STS-12/OC-12 12 108 216 108 432 9720 9288 95.556% 622.08 594.432
  STS-18/OC-18 18 162 324 162 648 14580 13932 95.556% 933.12 891.648
  STS-24/OC-24 24 216 432 216 864 19440 18576 95.556% 1244.16 1188.864
  STS-36/OC-36 36 324 648 324 1296 29160 27864 95.556% 1866.24 1783.296
  STS-48/OC-48 48 432 864 432 1728 38880 37152 95.556% 2488.32 2377.728
  STS-96/OC-96 96 864 1728 864 3456 77760 74304 95.556% 4976.64 4755.456
  STS-192/OC-192 192 1728 3456 1728 6912 155520 148608 95.556% 9953.28 9510.912
concatenated STS-3c/OC-3c 3 27 54 9 90 2430 2340 96.296% 155.52 149.76
  STS-9c/OC-9c 9 81 162 9 252 7290 7038 96.543% 466.56 450.432
  STS-12c/OC-12c 12 108 216 9 333 9720 9387 96.574% 622.08 600.768
  STS-18c/OC-18c 18 162 324 9 495 14580 14085 96.605% 933.12 901.44
  STS-24c/OC-24c 24 216 432 9 657 19440 18783 96.620% 1244.16 1202.112
  STS-36c/OC-36c 36 324 648 9 981 29160 28179 96.636% 1866.24 1803.456
  STS-48c/OC-48c 48 432 864 9 1305 38880 37575 96.644% 2488.32 2404.8
  STS-96c/OC-96c 96 864 1728 9 2601 77760 75159 96.655% 4976.64 4810.176
  STS-192c/OC-192c 192 1728 3456 9 5193 155520 150327 96.661% 9953.28 9620.928


Spreadsheet's Author:  Brent A. Musat
Last Updated 10/8/2002 with Excel 5.0 or 95
 
Created with xlhtml 0.4

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