Unverified80% confidenceDecision RuleTime unknown
选购时按接入设备数预留20-30%端口余量，如当前需6口应选8口，为后续扩展避免二次采购或级联损耗
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80%
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Long-term
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Unverified端口数量按实际设备数×1.5预留，8口机型实际可用建议接≤6台，留余量应对未来扩展和级联，避免买满即用满88% similarUnverified端口数越多单口成本越低但功耗发热和体积上升，家庭布线建议按现有设备数×1.5预留（如现有5台选8口），一次到位比后续级联省一层延迟80% similarUnverified选购前先统计线缆数量并预留20%冗余，后期新增设备（充电器、扩展坞）常导致理线板不够用69% similarUnverified接口尺寸需与入户主管匹配，国内家装总管多为4分(DN15)或6分(DN20)，选购前务必测量；接口不符需转接头，转接过多会造成额外压损和渗漏点69% similarUnverified安装前需确认自己轮组的辐条数量，一般套装按36根辐条配置，少辐条轮组（如20/24根）会有剩余，多辐条则需购买多套68% similar
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