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 DS0s are in an OC-768?

An OC-768 carries 516,096 DS0s, per Telcordia GR-253 and ANSI T1.107.

516,096

DS0s in an OC-768

Working

OC-768 → 768 × OC-1 (STS-1) → 28 × DS1 → 24 × DS0

768 × OC-1 (STS-1) in each OC-768 Telcordia GR-253768 × OC-1 (STS-1). Channelized OC-768 is 768 STS-1s.
28 × DS1 in each OC-1 (STS-1) Telcordia GR-253Seven VT groups × four VT1.5 (DS1).
24 × DS0 in each DS1 ANSI T1.10724 payload timeslots. The framing bit adds 8 kbit/s and brings the line rate to 1.544 Mbit/s.

768 OC-1s
768 × 28 = 21,504 DS1s
768 × 28 × 24 = 516,096 DS0s

Leftover capacity

6.782976 Gbit/s of each OC-768 line rate (39.813120 Gbit/s) sits outside 516,096 × 64 kbit/s of DS0 line rate (33.030144 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 DS0s by bit rate only. The standard mapping is 516,096. Use the mapping.

Share this result. Pairing page