N10-005 · Question #906
Which of the following connector types is only used with copper media?
The correct answer is D. DB-9. DB-9 is a serial (RS-232) connector used exclusively with copper cabling, while ST, SC, and MTRJ are all fiber optic connector types.
Question
Which of the following connector types is only used with copper media?
Options
- AST
- BSC
- CMTRJ
- DDB-9
How the community answered
(30 responses)- A7% (2)
- B3% (1)
- D90% (27)
Why each option
DB-9 is a serial (RS-232) connector used exclusively with copper cabling, while ST, SC, and MTRJ are all fiber optic connector types.
ST (Straight Tip) is a bayonet-style fiber optic connector used with both single-mode and multimode glass or plastic optical fiber, not copper.
SC (Subscriber Connector) is a push-pull fiber optic connector commonly used in data center and telecom fiber runs, not copper media.
MTRJ (Mechanical Transfer Registered Jack) is a small form-factor duplex fiber optic connector designed for both single-mode and multimode fiber, not copper.
The DB-9 (DE-9) is a D-subminiature connector used for RS-232 serial interfaces, which transmit electrical signals over copper conductors. It has no fiber optic variant and is therefore the only connector in the list exclusive to copper media.
Concept tested: Network connector types - copper vs fiber
Source: https://www.flukenetworks.com/knowledge-base/copper-testing/connector-types
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