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Hong Ruijiao, how do you identify inferior PoE switches?

Hong Ruijiao, how do you identify inferior PoE switches?
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    Telephone: 0755-27085760 
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    Email address:info@hruitech.com
    Address:Wangrong Industrial Park, Jiujiu Industrial City, Xihuan Road, Shajing Street, Baoan District, Shenzhen, China.
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