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This HP ProCurve 1000-BX-U SFP-LC Mini-GBIC (J9143B) is a small form-factor pluggable (SFP) Gigabit-BX (bi-directional) "upstream" transceiver that provides a full-duplex gigabit solution up to 10 km on one strand of singlemode fiber.
The J9143B connects to the J9142B "downstream" transceiver, or to any IEEE-standard 1000BASE-BX10-D ("downstream") device. (A 1000-BX-U transceiver can only connect to a 1000-BX-D product. You cannot connect two 1000-BX-U transceivers together).