The HP D3979-63001 is a legacy PCI Ethernet adapter designed for HP VECTRA XM 5 desktop systems. This card provides coaxial (10BASE2) network connectivity, supporting 10 Mbps half-duplex operation over thin Ethernet cable. The single-slot PCI form factor integrates directly into standard ISA/PCI motherboards typical of mid-1990s HP business desktops. Intended for environments requiring older network infrastructure compatibility, this adapter enables connectivity to legacy 10BASE2 coaxial networks still present in some enterprise environments. Assembly of internal components may be required upon installation. This refurbished unit has been tested and is guaranteed to meet original specifications; available via quote from G5 Network Group.