IBM 19K4309 PCI 10/100 Fast EtherLink Network Card EN1207D-TX NIC

IBM 19K4309 PCI 10/100 Fast EtherLink Network Card EN1207D-TX NIC

The IBM 19K4309 is a PCI 10/100 Fast EtherLink network interface card (NIC) built for IBM desktop and workstation platforms. It connects a PC to a 10BASE-T or 100BASE-TX Ethernet network via a single RJ-45 port, auto-negotiating between 10 Mbps and 100 Mbps link speeds. The card carries IBM FRU number 19K4309 and is based on the EN1207D-TX reference design with an MPX controller chipset.

Specifications & What's Included

• IBM FRU: 19K4309
• Secondary model / reference: EN1207D-TX
• Bus interface: PCI
• Network standard: 10BASE-T / 100BASE-TX (Fast Ethernet)
• Speed: 10/100 Mbps, auto-negotiating
• Port: 1× RJ-45
• Status LEDs: 3× green LEDs on bracket (link/activity/speed indicators)
• Chipset: MPX controller (visible on PCB)
• Form factor: Standard PCI card with full-height bracket
• Date code: May 1998
• Item is new and unused, still in anti-static protective sleeve

Applications

PCI 10/100 Fast Ethernet NICs like the IBM 19K4309 were standard equipment in late-1990s and early-2000s desktop PCs, workstations, and servers. This card was designed for IBM systems of that era — including IBM ThinkCentre desktops, IBM Netfinity servers, and IBM IntelliStation workstations — providing wired Ethernet connectivity where onboard networking was absent or had failed. Fast Ethernet (100BASE-TX) represented a major step up from 10BASE-T in the late 1990s, and cards like this were widely deployed in corporate environments upgrading their network infrastructure at that time. Today these cards remain useful for maintaining legacy IBM systems that require a PCI NIC, or for hobbyist and vintage computing projects. The PCI bus standard was dominant from the mid-1990s through the mid-2000s, and this card's full-height PCI edge connector is compatible with any standard PCI slot of that generation.