This read-only CoriantTypesFreq value (in MHz, not applicable to SFP+ pluggables) reports the actual receive local-oscillator laser frequency on the coherent optical channel (och-os) on the line side of a pluggable transceiver for a coherent interface with a separate local-oscillator laser from the transmit laser; a reported value of 0 means the two share the same laser. An administrator reads this to confirm the receive-side local oscillator has actually tuned to the intended frequency on interfaces sophisticated enough to tune Tx and Rx independently. For example, on och-os a correct, nonzero actual-Rx-frequency reading confirms the receive local oscillator is properly locked even while a separate transmit-side tuning issue is being diagnosed.