Result: standard mapping
How many E0s are in an OC-768?
An OC-768 carries 483,840 E0s, per Telcordia GR-253 and ITU-T G.704.
483,840
E0s in an OC-768
Working
OC-768 → 768 × OC-1 (STS-1) → 21 × E1 → 30 × E0
- 768 × OC-1 (STS-1) in each OC-768 Telcordia GR-253768 × OC-1 (STS-1). Channelized OC-768 is 768 STS-1s.
- 21 × E1 in each OC-1 (STS-1) Telcordia GR-253Seven VT groups × three VT2 (E1).
- 30 × E0 in each E1 ITU-T G.70430 voice channels in 32 timeslots. TS0 is framing and TS16 is channel-associated signalling.
- 768 OC-1s
- 768 × 21 = 16,128 E1s
- 768 × 21 × 30 = 483,840 E0s
Leftover capacity
8.847360 Gbit/s of each OC-768 line rate (39.813120 Gbit/s) sits outside 483,840 × 64 kbit/s of E0 line rate (30.965760 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 622,080, which floors to 622,080 E0s by bit rate only. The standard mapping is 483,840. Use the mapping.