YD 5046-1997 Temporary Design Specifications for Installation of Unattended Power Supply Equipments in Optical Fibre Cable Telecommunications Projects (English Version)
2006YD/T 5040-2005 Design Specifications of Engineering for Telecommunication Power Supply Equipment Installation
1997YD 5046-1997 Temporary Design Specifications for Installation of Unattended Power Supply Equipments in Optical Fibre Cable Telecommunications Projects
YD 5046-1997 Temporary Design Specifications for Installation of Unattended Power Supply Equipments in Optical Fibre Cable Telecommunications Projects was changed to YD/T 5040-2005 Design Specifications of Engineering for Telecommunication Power Supply Equipment Installation.