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A SONET Overview
Issue 1 December 1997 A-19
Higher Rate Transport 1
Higher rate SONET signals are created by byte-interleaving
N
STS-1 to form an
STS-
N
signal. The STS-
N
is then scrambled and converted to an optical carrier -
level
N
(OC-
N
) signal. The OC-
N
has a line rate of exactly
N
times the OC-1 signal
(see Table A-2).
Conclusion 1
The intent of this section is to present a short overview of SONET. More detailed
expositions can be found in various literature. An excellent description of SONET
can be found in Reference 3.
Table A-2. SONET Transport Rates
OC Level Line Rate (Mb/s) Capacity
OC-1 51.84 28 DS1s or 1 DS3
OC-3 155.52 84 DS1s or 3 DS3s
OC-9 466.56 252 DS1s or 9 DS3s
OC-12 622.08 336 DS1s or 12 DS3s
OC-18 933.122 504 DS1s or 18 DS3s
OC-24 1244.16 672 DS1s or 24 DS3s
OC-36 1866.24 1008 DS1s or 36 DS3s
OC-48 2488.32 1344 DS1s or 48 DS3s
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