IBM 19K4885Product Fast Ethernet switch module 10/100Base-TX PCI 1 port

Low-cost 10/100 PCI network card

The IBM 19K4885 adds a single RJ-45 port to a desktop PC through a standard PCI slot. It targets users who need basic wired connectivity on older systems without integrated Ethernet. The card supports 10BASE-T and 100BASE-TX speeds with auto-negotiation. It is not for buyers who require gigabit throughput or a modern PCI Express interface.

Passive cooling and minimal power draw

The plug-in card operates without a fan, so it adds no audible noise to the system. Power consumption stays low because the Intel Pro/100VE controller is designed for entry-level desktop use. Full-duplex flow control under IEEE 802.3x helps prevent packet loss during normal traffic. The compact 4.7 by 5.4 inch form factor fits most standard chassis.

Steady throughput under continuous load

Sustained file transfers hold at the negotiated 100 Mbps rate without thermal throttling. The single-port design means all bandwidth is dedicated to one link, avoiding contention. Auto-negotiation re-establishes the best speed if the link partner changes. Builders needing multiple ports or higher sustained bandwidth should select a multi-port gigabit adapter instead.