Result: standard mapping
How many E1s are in an E2?
An E2 carries 4 E1s, per ITU-T G.702.
4
E1s in an E2
Working
E2 → 4 × E1
- 4 × E1 in each E2 ITU-T G.702Four E1s.
- 4 E1s
Leftover capacity
256 kbit/s of each E2 line rate (8.448 Mbit/s) sits outside 4 × 2.048 Mbit/s of E1 line rate (8.192 Mbit/s). That remainder is overhead, fixed stuff or justification. It is not another whole tributary.