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-64?

A STM-64 carries 1,344 DS2s, per ITU-T G.707 and ANSI T1.107.

1,344

DS2s in a STM-64

Working

STM-64 → 64 × STM-1 → 3 × DS3 → 7 × DS2

64 × STM-1 in each STM-64 ITU-T G.70764 × 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.

64 STM-1s
64 × 3 = 192 DS3s
64 × 3 × 7 = 1,344 DS2s

Leftover capacity

1.469952 Gbit/s of each STM-64 line rate (9.953280 Gbit/s) sits outside 1,344 × 6.312 Mbit/s of DS2 line rate (8.483328 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 1,576.88, which floors to 1,576 DS2s by bit rate only. The standard mapping is 1,344. Use the mapping.

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