Overview
The 3Com 3C905B-TXNM is a PCI-based network interface card (NIC) that provides robust 10/100 Mbps Ethernet connectivity for legacy industrial systems, embedded controllers, and older computing platforms. This card is part of 3Com’s EtherLink XL family and delivers reliable network communication when system integration requires proven, established hardware. Though discontinued by the manufacturer, it remains in demand for maintenance, repair, and legacy system replacement applications.
Key Features
- Dual-speed 10/100 Mbps auto-negotiating Ethernet (10BASE-T/100BASE-TX)
- Single RJ-45 connector for direct connection to standard network infrastructure
- PCI form factor compatible with ISA/PCI motherboards and controllers
- No Remote Wake-Up connector—streamlined design for embedded applications
- Interactive Access technology to minimize CPU utilization during network operations
- Parallel Tasking II architecture for high throughput and low processor load
Technical Specifications
Network Performance:
- Speed: 10 Mbps or 100 Mbps (auto-negotiating)
- Media Type: 10BASE-T/100BASE-TX (Fast Ethernet)
- Connector Type: RJ-45
- Form Factor: PCI expansion card
- Option ROM Socket: 32-pin DIP
- Power Connectors: None required (bus-powered)
- Weight: 0.06 lbs
Typical Applications
- Legacy industrial PLC and HMI networking
- Embedded controller Ethernet connectivity
- Retrofit and maintenance of older CNC and automation platforms
- Industrial PC and single-board computer network upgrades
- Systems requiring proven, mature driver support and long-term availability
Compatibility & Replacements
Compatible With
- PCI-based motherboards and embedded controllers
- Industrial PC platforms and legacy single-board computers
- Standard 10BASE-T and 100BASE-TX Ethernet networks
- Windows 9x, Windows NT, Windows 2000, OS/2, NetWare, MS-DOS environments
Replaces / Drop-In Replacement For
- Original 3Com 3C905B-TXNM units in maintenance applications
- Verify compatibility with your specific system architecture and motherboard before ordering
Works With
- Standard TCP/IP network stacks
- Ethernet switching and hub infrastructure
- PXE boot environments (BIOS version 3.00)
- Legacy driver packages compatible with Windows NT 3.5+ and Windows 9x platforms
