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 E4s are in a STM-4?
A STM-4 carries 4 E4s, per ITU-T G.707. This is a client mapping of E4 into STM-1.
4
E4s in a STM-4
Working
STM-4 → 4 × STM-1 → 1 × E4
- 4 × STM-1 in each STM-4 ITU-T G.7074 × STM-1.
- 1 × E4 in each STM-1 ITU-T G.707Client mappingAsynchronous E4 mapped into the C-4 / VC-4. This client holds 64 E1s internally; the VC-12 tributary count of an STM-1 is 63.
- 4 STM-1s
- 4 × 1 = 4 E4s
Leftover capacity
65.024 Mbit/s of each STM-4 line rate (622.080 Mbit/s) sits outside 4 × 139.264 Mbit/s of E4 line rate (557.056 Mbit/s). That remainder is overhead, fixed stuff or justification. It is not another whole tributary.
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