How many DS3s are in a STM-1?

Working

STM-1 → 3 × DS3

1. 3 × DS3 in each STM-1 ITU-T G.707Three VC-3s, each able to carry a DS3.

• 3 DS3s

Leftover capacity

21.312 Mbit/s of each STM-1 line rate (155.520 Mbit/s) sits outside 3 × 44.736 Mbit/s of DS3 line rate (134.208 Mbit/s). That remainder is overhead, fixed stuff or justification. It is not another whole tributary.

STM-1 reference · DS3 reference · Open in the converter