Result: standard mapping
How many DS1s are in an ODU1?
An ODU1 carries 1,344 DS1s, per ITU-T G.709 and ITU-T G.707. This path maps STM-16 into ODU1 as a client, then follows that client's tributaries.
1,344
DS1s in an ODU1
Working
ODU1 → 1 × STM-16 → 16 × STM-1 → 84 × DS1
- 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.
- 1 STM-16
- 1 × 16 = 16 STM-1s
- 1 × 16 × 84 = 1,344 DS1s
Leftover capacity
423.639126 Mbit/s of each ODU1 line rate (2.498775126 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 1,618.37, which floors to 1,618 DS1s by bit rate only. The standard mapping is 1,344. Use the mapping.