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Difficulty: EasyTroubleshooting Physical Cabling and Connectors

A technician is troubleshooting a newly installed twisted-pair Ethernet cable run that fails to establish a link. A basic wire mapper indicates that pin 1 on one end is wired to pin 3 on the other end, and pin 2 is wired to pin 6. Which TWO of the following actions or tools should the technician use to resolve and verify this specific cabling issue?

  1. Re-terminate the cable connectors according to a single TIA/EIA 568B wiring standard on both ends.Answer
  2. Use a continuity wire mapper after re-termination to confirm correct pin-to-pin mapping.Answer
  3. C
    Use an Optical Power Meter to measure signal loss across the copper conductor pairs.
  4. D
    Connect a tone generator and probe to measure the exact distance to the pin miswire location.

Answer

The technician should re-terminate the cable connectors according to a consistent TIA/EIA 568B wiring scheme on both ends and use a continuity wire mapper to verify correct conductor alignment.
Re-terminating both ends of the cable according to the TIA/EIA 568B standard ensures proper pin alignment for a straight-through patch cable. Using a wire mapper after re-termination is the standard procedure to verify that all eight conductors map correctly pin-to-pin.

Step-by-Step Solution

1
Identify the cause of the failure based on the wire mapper reading.
Pins 1 and 2 mapped to pins 3 and 6 indicate an unintentional crossover or miswire condition.
Straight-through copper Ethernet runs require identical pin configurations (e.g., T568B to T568B) on both ends.
2
Correct the physical cabling termination.
Cut and re-strip the cable ends, then crimp modular RJ-45 connectors using standard T568B pinouts at both ends.
Proper pin alignment resolves the physical layer crossover fault.
3
Verify pin mapping with an appropriate cable testing tool.
Perform a test using a continuity wire mapper to confirm pin 1 connects to pin 1, pin 2 to pin 2, etc.
A wire mapper confirms pin-to-pin continuity and correct pair arrangement.

Key Concept

Pinout Standards and Wire Mapping Verification
Estimated Time:1m 0s
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Topics

Troubleshooting Physical Cabling and Connectors

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