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Good price high quality Zyxel SLB-1553L-20,SFP 100Base-BX10-D 20km/Tx1550/Rx1310nm/LC SFP-100BX1550-20, US $ 10 - 1000 / Piece, China, Zyxel, SFP-100BX1550-20.Source from Shanghai Harmuber Technology Development Co., Ltd. on Waimaotong.com.