Result: standard mapping
How many DS0s are in an ODU1?
An ODU1 carries 32,256 DS0s, per ITU-T G.709, ITU-T G.707 and ANSI T1.107. This path maps STM-16 into ODU1 as a client, then follows that client's tributaries.
32,256
DS0s in an ODU1
Working
ODU1 → 1 × STM-16 → 16 × STM-1 → 84 × DS1 → 24 × DS0
- 1 × STM-16 in each ODU1 ITU-T G.709Client mappingCBR STM-16 mapped into OPU1.
- 16 × STM-1 in each STM-16 ITU-T G.70716 × STM-1.
- 84 × DS1 in each STM-1 ITU-T G.70784 VC-11 tributaries: 3 TUG-3 × 7 TUG-2 × 4 TU-11.
- 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.
- 1 STM-16
- 1 × 16 = 16 STM-1s
- 1 × 16 × 84 = 1,344 DS1s
- 1 × 16 × 84 × 24 = 32,256 DS0s
Leftover capacity
434.391126 Mbit/s of each ODU1 line rate (2.498775126 Gbit/s) sits outside 32,256 × 64 kbit/s of DS0 line rate (2.064384 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 39,043.36, which floors to 39,043 DS0s by bit rate only. The standard mapping is 32,256. Use the mapping.