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-256?

A STM-256 carries 5,376 DS2s, per ITU-T G.707 and ANSI T1.107.

5,376

DS2s in a STM-256

Working

STM-256 → 256 × STM-1 → 3 × DS3 → 7 × DS2

256 × STM-1 in each STM-256 ITU-T G.707256 × 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.

256 STM-1s
256 × 3 = 768 DS3s
256 × 3 × 7 = 5,376 DS2s

Leftover capacity

5.879808 Gbit/s of each STM-256 line rate (39.813120 Gbit/s) sits outside 5,376 × 6.312 Mbit/s of DS2 line rate (33.933312 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 6,307.52, which floors to 6,307 DS2s by bit rate only. The standard mapping is 5,376. Use the mapping.

Share this result. Pairing page