zxr10PortGroupProtectReceiver reports the receiver-side protection mode of this port group, with selective(2) meaning the receiver actively chooses between the working and backup signal, per its description. An admin checks this to know whether the receiving end of the protection group performs signal selection, typical of 1+1 protection, rather than passively relying on the transmit side to switch. For example, a group configured as onePlusOne would typically report selective(2) here, since the receiver must pick the better of the two simultaneously-transmitted signals.