Quantity is how many containers you have. The result is how many tributaries fit, the path, and the leftover line rate. The choices stay in the URL, so you can share them.
Result: standard mapping
How many DS0s are in a STM-256?
A STM-256 carries 516,096 DS0s, per ITU-T G.707 and ANSI T1.107.
516,096
DS0s in a STM-256
Working
STM-256 → 256 × STM-1 → 84 × DS1 → 24 × DS0
- 256 × STM-1 in each STM-256 ITU-T G.707256 × STM-1.
- 84 × DS1 in each STM-1 ITU-T G.70784 VC-11 tributaries: 3 TUG-3 × 7 TUG-2 × 4 TU-11.
- 24 × DS0 in each DS1 ANSI T1.10724 payload timeslots. The framing bit adds 8 kbit/s and brings the line rate to 1.544 Mbit/s.
- 256 STM-1s
- 256 × 84 = 21,504 DS1s
- 256 × 84 × 24 = 516,096 DS0s
Leftover capacity
6.782976 Gbit/s of each STM-256 line rate (39.813120 Gbit/s) sits outside 516,096 × 64 kbit/s of DS0 line rate (33.030144 Gbit/s). That remainder is overhead, fixed stuff or justification. It is not another whole tributary.
By bit rate only
Dividing the line rates gives 622,080, which floors to 622,080 DS0s by bit rate only. The standard mapping is 516,096. Use the mapping.
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