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-64?
A STM-64 carries 129,024 DS0s, per ITU-T G.707 and ANSI T1.107.
129,024
DS0s in a STM-64
Working
STM-64 → 64 × STM-1 → 84 × DS1 → 24 × DS0
- 64 × STM-1 in each STM-64 ITU-T G.70764 × 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.
- 64 STM-1s
- 64 × 84 = 5,376 DS1s
- 64 × 84 × 24 = 129,024 DS0s
Leftover capacity
1.695744 Gbit/s of each STM-64 line rate (9.953280 Gbit/s) sits outside 129,024 × 64 kbit/s of DS0 line rate (8.257536 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 155,520, which floors to 155,520 DS0s by bit rate only. The standard mapping is 129,024. Use the mapping.
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