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 DS2s are in a STM-4?
A STM-4 carries 84 DS2s, per ITU-T G.707 and ANSI T1.107.
84
DS2s in a STM-4
Working
STM-4 → 4 × STM-1 → 3 × DS3 → 7 × DS2
- 4 × STM-1 in each STM-4 ITU-T G.7074 × STM-1.
- 3 × DS3 in each STM-1 ITU-T G.707Three VC-3s, each able to carry a DS3.
- 7 × DS2 in each DS3 ANSI T1.107M13 multiplex: seven DS2s.
- 4 STM-1s
- 4 × 3 = 12 DS3s
- 4 × 3 × 7 = 84 DS2s
Leftover capacity
91.872 Mbit/s of each STM-4 line rate (622.080 Mbit/s) sits outside 84 × 6.312 Mbit/s of DS2 line rate (530.208 Mbit/s). That remainder is overhead, fixed stuff or justification. It is not another whole tributary.
By bit rate only
Dividing the line rates gives 98.55, which floors to 98 DS2s by bit rate only. The standard mapping is 84. Use the mapping.
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