Cabling history: in which LAN cabling system are BNC T-connectors and 50-ohm terminators required on the bus?

Introduction / Context: Early Ethernet implementations used a coaxial bus topology before the widespread adoption of twisted-pair star wiring. Recognizing which variant required BNC T-connectors and end-of-line terminators is a common historical networking question and helps diagnose legacy installations still in service.

Given Data / Assumptions:

• We compare LAN cabling types: 10Base2, Token Ring, 10Base-T, FDDI.
• Focus is on the presence of T-connectors and terminators.
• Coaxial bus topologies require proper termination to avoid reflections.

Concept / Approach: 10Base2 (Thin Ethernet) uses RG-58 coaxial cable with BNC T-connectors to attach NICs to the bus and 50-ohm terminators at both ends to prevent signal reflections. Token Ring typically uses MAUs with shielded twisted pair; 10Base-T uses star topology with UTP and has no coax terminators; FDDI employs fiber dual-rings, again without BNC T-connectors or 50-ohm terminators.

Step-by-Step Solution:

Verification / Alternative check: Vendor guides and certification materials depict 10Base2 with T-connectors and terminators, reinforcing the selection.

Why Other Options Are Wrong:

Common Pitfalls: Confusing 10Base5 (thick coax/vampire taps) with 10Base2; both used coax and termination, but T-connectors specifically identify 10Base2.

Final Answer: Thin Ethernet (10Base2).