SDH Standard Bit Rates

The standard SDH bits rates are shown in Table 19.2. ITU-T Rec. G.707 (Ref. 5) states "that the first level digital hierarchy shall be 155,520 kbps ... and ... higher synchronous digital hierarchy rates shall be obtained as integer multiples of the first level bit rate."

7This implies a DS3 configuration. It contains 28 DS1s.

Table 19.2 SDH Bit Rates with SONET Equivalents

SONET Equivalent

SDH LevelĀ®

SDH Bit Rate (kbps)

Line Rate

1

155,520

STS-3/OC-3

4

622,080

STS-12/OC-12

16

2,488,320

STS-48/OC48

aTwo other SDH hierarchical levels are under consideration by CCITT (Ref. 5):

Level 8 1,244,160 kbps; Level 12 1,866,240 kbps.

aTwo other SDH hierarchical levels are under consideration by CCITT (Ref. 5):

Level 8 1,244,160 kbps; Level 12 1,866,240 kbps.

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