What a DS3 contains
A DS3 carries 672 DS0s, per ANSI T1.107.
DS3 → 28 × DS1 → 24 × DS0
- 28 DS1s
- 28 × 24 = 672 DS0s
Down to DS0
DS3
- 28 × DS1 ANSI T1.10728 DS1s, which is 7 DS2s × 4 DS1s.
- 24 × DS0 ANSI T1.10724 payload timeslots. The framing bit adds 8 kbit/s and brings the line rate to 1.544 Mbit/s.
- 7 × DS2 ANSI T1.107M13 multiplex: seven DS2s.
DS3 rates and aliases