A network administrator tests a multimode fiber cable from end-to-end on a new link that is down and notices that the dB loss is -.09. Which of the following is the MOST likely cause?

The correct answer is A. TXRX reversed. Some Ethernet switches support medium dependent interface crossover (MDIX),which allows a switch port to properly configure its leads as transmit (Tx) or receive (Rx) leads. You can interconnect such switches with a straight-through cable (as opposed to a crossover cable)…

Network troubleshooting

Question

Options

ATXRX reversed
BdB loss too high
CdB loss too low
DBad connectors

How the community answered

(52 responses)

A
75% (39)
B
8% (4)
C
13% (7)
D
4% (2)

Explanation

Some Ethernet switches support medium dependent interface crossover (MDIX),which allows a switch port to properly configure its leads as transmit (Tx) or receive (Rx) leads. You can interconnect such switches with a straight-through cable (as opposed to a crossover cable). However, if a network device does not support MDIX, it needs an appropriate cable (that is, a crossover cable ) to allow its Tx leads to connect to the Rx leads on a connected device, and vice Therefore, care must be taken when selecting cable types interconnecting network components.

Topics

#fiber optic#dB loss#multimode fiber#TXRX polarity

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