This part of GB/I39564 specifies the composition, classification and naming, requirements, test methods, inspection rules and signs, packaging, and transportation of fiber optic cable transfer box products in shared distribution facilities for multiple telecommunication service operators. and storage. This part is applicable to the optical cable transfer box for multiple telecommunication service operators in FTTH. The optical cable transfer box for multiple telecommunication service operators in other scenarios can also be used as a reference. Note: Refer to Appendix A for the selection guide of the distribution facilities in FTTH.