This read-only CoriantTypesFreq value (in MHz) reports the laser frequency the coherent optical channel (och-os) on the line side of a pluggable transceiver is actually operating at right now, reflecting both Rx and Tx frequency for a coherent interface when the configured Rx frequency is 0. An administrator compares this to the configured frequency to confirm the transceiver has actually tuned to the intended wavelength rather than trusting the configuration alone. For example, reading a different value here than what was configured on och-os would indicate the optics failed to tune correctly, prompting a technician to inspect the pluggable module.