zxr10PortGroupProtectType reports whether this port protection group uses a 1:1 (oneByOne) or 1+1 (onePlusOne) protection scheme, per its description. An admin uses this to understand the redundancy model in place for the group, since 1:1 normally carries traffic on the working port with the protect port free for switchover, while 1+1 sends the signal on both simultaneously. For example, onePlusOne(3) on a port group means both the working and backup ports are actively transmitting the same signal so that a failure causes a near-instant receiver-side switch.