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https://sites.google.com/view/dvlapmangvnpt/ Toc do truy cap dich vu lap cap quang vnpt cao, on dinh. Bang tan rong dam bao khong nghen mang, khong qua tai cung nhu khong bi suy hao tin hieu vi do dai cua cap hay nhieu dien tu. An toan cho cac thiet bi, khong lo bi set danh lan truyen tren duong day.