3Com 3C16670 LinkBuilder FMS II 12-Port 10Base-T Ethernet Hub Rackmount

3Com 3C16670 LinkBuilder FMS II 12-Port 10Base-T Ethernet Hub Rackmount

The 3Com 3C16670 is a 12-port 10Base-T Ethernet hub from 3Com's LinkBuilder FMS II product line. It provides 12 RJ-45 ports for connecting workstations and devices to a shared 10 Mbps Ethernet network segment. The unit is housed in a 1U rackmount chassis and accepts universal AC input (100–240V), making it compatible with both North American and international power infrastructure.

Specifications & What's Included

• Model: 3Com 3C16670
• Series: LinkBuilder FMS II
• Networking Standard: 10Base-T (IEEE 802.3), 10 Mbps
• Front Panel Ports: 12 × RJ-45 (10Base-T)
• Rear Expansion Ports: 2 × DB-50 (Telco/SCSI-style) stacking/expansion connectors
• Rear Auxiliary Port: 1 × DB-15 connector
• Power Input: 100–240V AC, 50/60 Hz, 1.5A; 2.0A fuse
• Power Connector: IEC C14 (standard 3-prong AC inlet)
• Front Panel Indicators: Per-port LED status array (ports 1–12), STATUS LEDs
• Form Factor: 1U rackmount
• Included: Hub unit only — no power cord, cables, or accessories

Applications

The 3Com LinkBuilder FMS II series was designed for departmental and workgroup Ethernet networks in the mid-1990s, when 10Base-T over unshielded twisted-pair cabling was the dominant LAN standard. Hubs like this one served as the central connection point for shared Ethernet segments, allowing multiple workstations, servers, and printers to communicate on the same network. The DB-50 expansion ports allowed multiple FMS II units to be stacked or cascaded, extending the network without additional uplink hardware. Today, units like this see use in legacy network lab environments, vintage computing setups, and hobbyist or retro networking projects where 10 Mbps shared Ethernet infrastructure is still needed — for instance, connecting period-correct hardware such as early 1990s Sun, HP, or IBM workstations that lack support for faster standards.