A field technician is deploying a custom twisted-pair Ethernet patch cable to connect two older Layer 2 switches that do not support Auto-MDIX. The technician terminates End 1 using the T568A standard. On End 2, the technician arranges the wire positions as follows: Pin 1 (White/Green), Pin 2 (Green), Pin 3 (White/Orange), Pin 4 (Blue), Pin 5 (White/Blue), Pin 6 (Orange), Pin 7 (White/Brown), and Pin 8 (Brown). After plugging in the cable, the link LEDs on both switch ports remain unlit. Which of the following pinout modifications must the technician make to End 2 to resolve the issue and establish link connectivity?
- Swap the position of the White/Green and Green wires (pins 1 and 2) with the White/Orange and Orange wires (pins 3 and 6).Cevap
- BSwap the position of the Blue and White/Blue wires (pins 4 and 5) with the White/Brown and Brown wires (pins 7 and 8).
- CReverse all eight wire positions on End 2 completely so that Pin 1 becomes Pin 8 and Pin 2 becomes Pin 7.
- DSwap each solid-colored wire with its corresponding striped wire across all four twisted pairs on End 2.
Cevap
Swap the position of the White/Green and Green wires (pins 1 and 2) with the White/Orange and Orange wires (pins 3 and 6) on End 2.
To connect two legacy switches that lack Auto-MDIX support, a crossover cable is required. A crossover cable has T568A pinout on one end and T568B pinout on the other. In this scenario, End 1 was terminated using T568A, but End 2 was also wired using T568A (White/Green on pins 1/2, White/Orange on pins 3/6), producing a straight-through cable. Swapping the White/Green and Green wires (pins 1 and 2) with the White/Orange and Orange wires (pins 3 and 6) reconfigures End 2 into the T568B standard, successfully establishing the crossover transmit/receive path.
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Ethernet Crossover Cable Pinout (T568A vs T568B)
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