Abstract: In a transmission node, a portion of the control information is separated into M (M is an integer) parts of control information blocks having N (N is an integer) bit length. A control information parity having (8?N) bit length is added to control information block i. The control information block is encoded to M parts of control information having 8 bit length according to a predetermined control information bit array. The control information parity and the control information bit array are set such that Hamming distance of each of the control information code is d, and Hamming distance of the control information 10B code is D (d and D are integers). In a receiving node, the control information code is separated into the control information block and the control information parity. Parity check is performed. When an error is detected, error processing is performed.

Abstract: A thin flat twisted-pair gap cable and gap navigator unit reduces the diameter of twisted-pair wire, aligns them side by side, and fuses and fixes them in place with two plies of tape so as to flatten the conventional round twisted-pair cable in order to pass the conventional round twisted-pair cable used for high-speed transmission through a gap in a window sash or the like. Two core wires each consisting of a small-diameter conductor covered with an insulating covering of PE or the like are twisted together evenly to make the twisted-pair wires, with the necessary number of twisted-pair wires aligned side by side. The insides of two plies of plastic tape are coated with a thermoplastic adhesive and the aforementioned cable is inserted into and sandwiched between the two plies of plastic tape and the tape fused together so that the twisted-pair wires aligned side by side come in the middle of the width of the tape to form a flattened gap cable.