How to calculate OTN bit rates?

We know that in SDH frame rate is fixed i.e. 125us.

But in case of OTN, it is variable rather frame size is fixed.

So, frame rate calculation for OTN could be done by following method:-

Frame Rate (us) =ODUk frame size(bits)/ODUk bit rate(bits/s)…………………………………….(1)

 Also, we know that 

STM16=OPU1==16*9*270*8*8000=2488320000 bits/s

 Now assume that multiplicative factor (M_k)** for rate calculation of various rates

Now, Master Formula to calculate bit rate for different O(P/D/T)U_k will be

Bit Rate for O(P/D/T)U_{k b/s} =M_k*X*STM16=M_k*X*2488320000 b/s………..(2)

Where X=granularity in order of STM16 for OTN bit rates(x=1,4,40,160)

Putting values of equation(2) in equation(1) we will get OTN frame rates.

Eg:-

For further queries revert:)

**Multiplicative factor is just a simple math :eg. for ODU1/OPU1=3824/3808={(239*16)/(238*16)}

Here value of multiplication factor will give the number of times  for rise in the frame size after adding header/overhead.