Result: standard mapping
How many DS1s are in an ODU2?
An ODU2 carries 5,376 DS1s, per ITU-T G.709 and ITU-T G.707. This path maps STM-64 into ODU2 as a client, then follows that client's tributaries.
5,376
DS1s in an ODU2
Working
ODU2 → 1 × STM-64 → 64 × STM-1 → 84 × DS1
- 1 × STM-64 in each ODU2 ITU-T G.709Client mappingCBR STM-64 mapped into OPU2.
- 64 × STM-1 in each STM-64 ITU-T G.70764 × STM-1.
- 84 × DS1 in each STM-1 ITU-T G.70784 VC-11 tributaries: 3 TUG-3 × 7 TUG-2 × 4 TU-11.
- 1 STM-64
- 1 × 64 = 64 STM-1s
- 1 × 64 × 84 = 5,376 DS1s
Leftover capacity
1.736729924 Gbit/s of each ODU2 line rate (10.037273924 Gbit/s) sits outside 5,376 × 1.544 Mbit/s of DS1 line rate (8.300544 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 6,500.82, which floors to 6,500 DS1s by bit rate only. The standard mapping is 5,376. Use the mapping.