HYV is copper conductor solid polyolefin insulation self-supporting moisture barrier polyethylene sheath local communication cable. The annealed pure copper wire insulated with high density polyethylene, each two different color insulated wires twisted into a pair. The cable core is composed of twisted wire pair. After an aluminum tape is longitudinally applied around the cable core to act as moisture barrier, this part of cable accompanied with the stranded wires as the supporting part are completed with a polyethylene (PE) sheath to be figure 8 structure. It is used for transmitting audio frequency signals, analog signal up to 150kHZ or digital signals up to 2048kbit/s and in certain condition can carry digital signals, which is higher than 2048kbit/s.