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