A network technician is inspecting a newly installed Category 6A copper link between a patch panel and an end-user wall outlet that fails to negotiate a 10Gbps connection and frequently drops packets. A cable certifier report indicates a wire map failure with an open circuit on pins 4 and 5, along with severe Near-End Crosstalk (NEXT) on pairs 1-2 and 3-6. Which of the following physical layer conditions are the most likely causes of these test results? (Select TWO.)
- Excessive untwisting of wire pairs near the patch panel punch-down block termination pointAnswer
- An unseated conductor or incomplete crimp on pins 4 and 5 inside the modular connectorAnswer
- CUsing a tone generator and inductive probe to pinpoint the exact distance to the physical break
- DAn auto-negotiation duplex mismatch between the switch port and the workstation network card
Answer
The correct physical layer causes are excessive untwisting of wire pairs near the termination point and an unseated conductor on pins 4 and 5.
Excessive untwisting of wire pairs removes the inherent noise cancellation of twisted-pair media, inducing high NEXT interference. In addition, an open reading on specific pins indicates an incomplete pin crimp or unseated conductor preventing physical continuity.
Step-by-Step Solution
Key Concept
Physical layer copper cable troubleshooting, crosstalk mitigation, and wire map diagnostics
Estimated Time:1m 30s