QoS | Committed Information Rate

This is example about CIR. I have a link T1 with limit bandwidth CIR 768 kbps, BC set 96000 CIR/8, how many TC to across a link?

TC = BC / CIR
TC = 96000 / 768000 
   = 0.125 s 
   = 125 ms
   = 1/8 s

ex. #2
CIR 1024 kbps
BC 256000
TC = 256000 / 1024000
   = 0.25 s
   = 250 ms
   = 1/4 s

CIR : Committed Information Rate
TC : time committed
BC : burst committed