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See Chinese contents: YD/T 868-2007 YD/T 868-2007: Technical Requirements and Measuring Methods for Additional Equipments of Telephone Set
This Standard specifies the technical requirements and measuring methods for the additional equipment, including functional requirements, basic technical requirements and environmental test, electromagnetic compatibility, safety and lightning protection. This Standard applies to the equipment for the access to the PSTN network, which is capable of performing the auxiliary functions independently or along with the telephone set.
