14.2 Physical Layer Troubleshooting

Question 1

What are some of the common layer 1 issues?

Answer 1

Bad cables or connectors, bad port, opens and shorts, splitting pairs in a cable, dB loss, transposed TX/Rx leads, Cable Placement, distance limitations exceeded, crosstalk, speed/duplex mismatch, transceiver mismatch.

Question 2

Physical Copper Cables issues could include:

Answer 2

Shorts, opens, incorrect cabling, EMI/RFI, attenuation, crosstalk, bad connector, bad cable, using too long of a run.

Question 3

Physical fiber cable issues could include:

Answer 3

Attenuation, connector mismatch, wavelength mismatch, fiber-type mismatch, dirty connector, extreme bends in fiber, or trying to use too long of a fiber cable based on the specifications for that fiber.