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 E2s are in a STM-64?
A STM-64 carries 768 E2s, per ITU-T G.707 and ITU-T G.702.
768
E2s in a STM-64
Working
STM-64 → 64 × STM-1 → 3 × E3 → 4 × E2
- 64 × STM-1 in each STM-64 ITU-T G.70764 × STM-1.
- 3 × E3 in each STM-1 ITU-T G.707Three VC-3s, each carrying an E3.
- 4 × E2 in each E3 ITU-T G.702Four E2s.
- 64 STM-1s
- 64 × 3 = 192 E3s
- 64 × 3 × 4 = 768 E2s
Leftover capacity
3.465216 Gbit/s of each STM-64 line rate (9.953280 Gbit/s) sits outside 768 × 8.448 Mbit/s of E2 line rate (6.488064 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 1,178.18, which floors to 1,178 E2s by bit rate only. The standard mapping is 768. Use the mapping.
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