HYA type, HYAC cable for telephone exchange area, relay trunk and design local telecommunication cables, can be used to rate and below 2B + D digital signal transmission of audio signals and integrated services digital network can also be used to transfer 2048kbit / 8 or a digital signal 150KHz below the analog signal. HYA series is mainly used for pipe laying cable can also be used for overhead, but need to use hanging wire. HYAC for aerial cable only, no use hanging wire and hooks. HYA53 cable to improve the mechanical strength and resistance to erosion of the cable can be laid either way, more suitable for direct burial in rocky areas. Temperature are: -30 ℃ ﹀ + 60 ℃.