Cisco original Xenpak-10G-LX4 module
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10 Gigabit Ethernet XENPAK Transceiver, 1550 nm, up to 40 km on single-mode fiber, SC connector.
we also have the other original 10G transceivers , such as :
XFP-10G-SR (original finisar)
All the product are new in retailed box and with one year warranty , the product is both with good quality and competitive price .