Result: standard mapping
How many DS2s are in a STM-16?
A STM-16 carries 336 DS2s, per ITU-T G.707 and ANSI T1.107.
336
DS2s in a STM-16
Working
STM-16 → 16 × STM-1 → 3 × DS3 → 7 × DS2
- 16 × STM-1 in each STM-16 ITU-T G.70716 × 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.
- 16 STM-1s
- 16 × 3 = 48 DS3s
- 16 × 3 × 7 = 336 DS2s
Leftover capacity
367.488 Mbit/s of each STM-16 line rate (2.488320 Gbit/s) sits outside 336 × 6.312 Mbit/s of DS2 line rate (2.120832 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 394.22, which floors to 394 DS2s by bit rate only. The standard mapping is 336. Use the mapping.