HP J4864A Hewlett-Packard HP ProCurve networking / enterprise server hardware Optical Transmission Module

The HP J4864A is a ProCurve Switch GL transceiver module, a fibre Gigabit expansion port for the Switch 4000M and 8000M “GL” chassis switch family, allowing an existing GL chassis to connect via fibre rather than copper for uplinks or server connections. As with other mini-GBIC style transceivers of this era, the specific optical type (SX, LX or similar) determines the fibre type and distance it will support. It fits into the dedicated transceiver slot on a GL-series chassis alongside the fixed copper ports already built into the unit. This is the correct spare for restoring a failed fibre uplink or for adding fibre connectivity to an existing GL chassis. Specifiers should confirm their fibre type and required link distance before ordering. Tech-Star (UK-based, shipped worldwide) sources and tests refurbished HP parts like this one to keep GL-series deployments running past end of manufacturer support.