The ratio of discarded cells to cells that are successfully transmitted.
discarded cells
CLR = -----------------
transmitted cells
CLR is defined in the ATM Forum's "Traffic Management Specification - Version 4.0" as a method of using OAM cells for in-service measurement of cell loss. This is fully described in Annex C of ITU-T Recommendation I.356. OEM cells with a count of the number of user information cells transmitted since the last OAM cell are inserted into the cell stream. The receiver kiips track of the number of user information cells transmitted (Nt) and received (Nr). The Cell Loss Ratio calculation is:
CLR = (Nt - Nr)/Nt if Nt - Nr > 0