Turns the channel contention detection and avoidance feature on or off. This feature is used to detect the situation where the modem port turn on a wavelength (or frequency in Gridless mode) that is in use by an existing L0 connection on a colorless network. This feature will be triggered by new wavelength/frequency provisioning and will automatically detects if the provisioned wavelength/frequency is already used. If the provisioned wavelength/frequency is already used, it declares channel contention, and then it will hold the Line port TX in a low power state (<-35 dBm) and will raise a Channel Contention alarm. This feature will also provide a mechanism to allow user to manually release the Line port TX from being held in a low power state while the channel collision declared.