Cordless telephone

Abstract From the Canadian patent

The invention provides means for detecting errors in the transmission of protocol data words between the handset station and base station of a cordless telephone set. Assuming the protocol data words are eight bits in length a sixteen bit, security code word is provided which consists of a high security byte and a low security byte. At the transmitting station (either the hand set or base), the protocol data byte is exclusive-ored with both the high security byte and the low security byte. The two resulting bytes are appended to the original protocol data byte to form a twenty-four bit error detection code. This error detection code is transmitted to the receiving station. The receiving …