A parallel redundancy protocol (PRP) frame is generated at a first electronic device for transmission to a second electronic device over a LAN and a WAN. The PRP frame includes a source MAC address field, packet data, and a redundancy control trailer (RCT). The RCT is compliant with IEC standard 62439-3 and includes a sequence number field, a LAN identifier field, and a frame size field. The source MAC address of the first electronic device and at least one of a sequence number, a LAN identifier and a frame size for the RCT fields of the PRP frame are encoded, and the encoded data is inserted in at least one of the RCT fields of the PRP frame in place of the sequence number, LAN identifier and/or frame size. The PRP frame is transmitted to the second electronic device with the encoded data in the RCT.