Result: standard mapping
How many DS1s are in an OC-48?
An OC-48 carries 1,344 DS1s, per Telcordia GR-253.
1,344
DS1s in an OC-48
Working
OC-48 → 48 × OC-1 (STS-1) → 28 × DS1
- 48 × OC-1 (STS-1) in each OC-48 Telcordia GR-25348 × OC-1 (STS-1). Channelized OC-48 is 48 STS-1s.
- 28 × DS1 in each OC-1 (STS-1) Telcordia GR-253Seven VT groups × four VT1.5 (DS1).
- 48 OC-1s
- 48 × 28 = 1,344 DS1s
Leftover capacity
413.184 Mbit/s of each OC-48 line rate (2.488320 Gbit/s) sits outside 1,344 × 1.544 Mbit/s of DS1 line rate (2.075136 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 1,611.6, which floors to 1,611 DS1s by bit rate only. The standard mapping is 1,344. Use the mapping.