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 E0s are in a STM-1?

A STM-1 carries 1,890 E0s, per ITU-T G.707 and ITU-T G.704.

1,890

E0s in a STM-1

Working

STM-1 → 63 × E1 → 30 × E0

63 × E1 in each STM-1 ITU-T G.70763 VC-12 tributaries: 3 TUG-3 × 7 TUG-2 × 3 TU-12.
30 × E0 in each E1 ITU-T G.70430 voice channels in 32 timeslots. TS0 is framing and TS16 is channel-associated signalling.

63 E1s
63 × 30 = 1,890 E0s

Leftover capacity

34.560 Mbit/s of each STM-1 line rate (155.520 Mbit/s) sits outside 1,890 × 64 kbit/s of E0 line rate (120.960 Mbit/s). That remainder is overhead, fixed stuff or justification. It is not another whole tributary.

By bit rate only

Dividing the line rates gives 2,430, which floors to 2,430 E0s by bit rate only. The standard mapping is 1,890. Use the mapping.

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