PTP 800 supports a 1+1 Hot Standby configuration where the wireless link is protected against hardware failure. This requires the installation of redundant equipment at each end of the wireless link including a secondary CMU and RFU. At a given end of the wireless link, only one CMU / RFU is Active at any one time, the neighbor CMU / RFU being Inactive. When a fault is detected on the Active CMU / RFU, the Active role will automatically switch to the Inactive CMU / RFU. To enable functionality associated with this feature, this attribute must be configured for a setting of 1+1.