This standard specifies the structure, requirements, test methods, markings, packaging, etc. of PVC insulated and PVC sheathed cables for program-controlled switching offices. This standard applies to the manufacture, use and acceptance of cables. The cable is mainly used for the audio connection between the main distribution frame in the program-controlled switching office and the user circuit board of the switching office. It can also be used for the audio connection between other communication equipment.
YD/T 817-1996 history
2008YD/T 1820-2008 Telecommunication Cables Central Office.Symmetrical Cables