GYDXW is a single armored central tube ribbon cable designed for direct buried, duct and aerial applications. This Specification covers the design requirements and performance standard for the supply of optical fibre cable in the industry. Optical. Huamai Photoelectric is an high-tech industrial Company, aiming to develop, manufacture and sell optoelectronic devices. The special low-bending-sensitivity core enables this cable to achieve high transmission. ITU-T G. The tubSe is wra e water-blocking material is applied t steel wires are pl le: generally is 2KM, can be required � ersio wavel disp Maxim Indi Desig Link ff wa lengt le cu ff wa Attenua on unif ≤1.