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SDH equipment huawei OSN 3500 II SSN2BPA (14/-38 LC) HUAWEI BPA SSN2BPA (14 / - 38, LC) optical power and the preamplifier plate (DBM ~ 38-10 DBM, 22 db ~ 33 db; - 6 DBM ~ + 3 DBM, 14 DBM, LC) We can ...