N10-005 · Question #683
Which of the following cable types use pins 1 and 2 to transmit and 3 and 6 to receive?
The correct answer is D. Straight-though. In a standard straight-through Ethernet cable (used to connect different device types, e.g., a PC to a switch), pins 1 and 2 are the transmit pair (Tx+/Tx-) on the workstation/PC end, and pins 3 and 6 are the receive pair (Rx+/Rx-). A crossover cable swaps these pairs so that…
Question
Which of the following cable types use pins 1 and 2 to transmit and 3 and 6 to receive?
Options
- ACoaxial
- BCrossover
- CMultimode fiber
- DStraight-though
How the community answered
(17 responses)- A6% (1)
- B6% (1)
- D88% (15)
Explanation
In a standard straight-through Ethernet cable (used to connect different device types, e.g., a PC to a switch), pins 1 and 2 are the transmit pair (Tx+/Tx-) on the workstation/PC end, and pins 3 and 6 are the receive pair (Rx+/Rx-). A crossover cable swaps these pairs so that the transmit of one end connects to the receive of the other (used to connect like devices). Coaxial cables use a single center conductor and shield, and multimode fiber uses light - neither use RJ-45 pin assignments.
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