The network technician is troubleshooting a connectivity issue on a CAT5 cable with a wire map and notices that only pins 1, 3, and 6 are mapping correctly. Which of the following pins are open and…

The correct answer is A. 2. In standard Ethernet wiring (T568B), 100BaseT uses two pairs: pins 1 & 2 (the orange pair, transmit) and pins 3 & 6 (the green pair, receive). Pin 1 is the white/orange wire and pin 2 is the solid orange wire-they are a matched pair. If pins 1, 3, and 6 map correctly but pin 2…

Network troubleshooting

Question

The network technician is troubleshooting a connectivity issue on a CAT5 cable with a wire map and notices that only pins 1, 3, and 6 are mapping correctly. Which of the following pins are open and keeping traffic from flowing correctly?

Options

How the community answered

(60 responses)

A
75% (45)
B
15% (9)
C
3% (2)
D
7% (4)

Explanation

In standard Ethernet wiring (T568B), 100BaseT uses two pairs: pins 1 & 2 (the orange pair, transmit) and pins 3 & 6 (the green pair, receive). Pin 1 is the white/orange wire and pin 2 is the solid orange wire-they are a matched pair. If pins 1, 3, and 6 map correctly but pin 2 does not, then pin 2 is the open conductor. Since pin 2 is part of the transmit pair (with pin 1), its failure breaks that pair's continuity, preventing proper data transmission. Pins 4 and 5 (choice B/C) are part of the unused blue pair in 100BaseT. Pin 8 (choice D) is part of the unused brown pair. Pin 2 is the only answer that is paired with a correctly-mapping pin and whose absence would disrupt traffic.

Topics

#wire map#open pins#Ethernet wiring#cable testing

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