Safe checkout
Secure payments
Fast dispatch
1–2 day handling
Free shipping
U.S. ground
Warranty & RMA
Support after delivery
3C509B-COMBO - 3Com EtherLink III Combo 16-Bit 10Base-/10Base-T Ethernet Network Adapter
- Network Interface Card (NIC)
- Bus Type: 16-Bit ISA
- Ethernet Speed: 10Mbps (10Base-T)
- Connectors: 1 x RJ45 (10Base-T), 1 x BNC (10Base-2)
- Model: Etherlink III
- Manufacturer: 3Com
- SKU: 3C509B-COMBO
3C509B-COMBO isn't on our shelf today — we source it to order. Request a quote and we'll confirm price and lead time within one business day.
Key specifications
See full specs ↓- Bus Type
- 16-Bit ISA
- Ethernet Speed
- 10Mbps
- Connectors
- RJ45, BNC
- Model
- Etherlink III
- Manufacturer
- 3Com
Product details
The 3Com 3C509B-COMBO Etherlink III is a 16-bit ISA network interface card. It offers a combo connection supporting both 10Base-T (RJ45) and 10Base-2 (BNC) Ethernet standards, providing versatile connectivity for older systems.
Technical Information
| Bus Type | 16-Bit ISA |
| Ethernet Speed | 10Mbps |
| Connectors | RJ45, BNC |
Additional Specifications
| Model | Etherlink III |
| Manufacturer | 3Com |
Description
The 3Com 3C509B-COMBO Etherlink III is a legacy network interface card designed for older computer systems that utilize the ISA bus. This card provides 10Mbps Ethernet connectivity, commonly known as 10Base-T. Its primary advantage is its 'combo' nature, offering both an RJ45 port for twisted-pair Ethernet cabling and a BNC connector for coaxial cable connections (10Base-2). This dual-connector capability made the 3C509B highly versatile in its time, allowing administrators to connect to different network infrastructures without needing separate cards. The 16-bit ISA interface was standard for many PCs and workstations from the late 1980s through the mid-1990s. The Etherlink III series was known for its reliability and ease of configuration, often using plug-and-play features or simple jumpers. While largely obsolete for modern high-speed networks, this card is still relevant for maintaining or restoring legacy systems, vintage computer enthusiasts, or specific industrial control applications that may still operate on older hardware and network protocols. Its inclusion of both RJ45 and BNC ports makes it a valuable component for bridging older network segments.
Condition: Refurbished
Free U.S. ground shipping
Typically 1–2 days handling, 3–7 days in transit.
Purchase orders accepted
Government, enterprise, data center and small business.
Buying 10+ units?
Get volume pricing and availability for 3C509B-COMBO.
