Question

A technician is tasked with connecting a router to a DWDM. The technician connects the router to the multiplexer and confirms that there is a good signal level. However, the interface on the router will not come up. Which of the following is the MOST likely cause?

1) The wrong wavelength was demuxed from the multiplexer.
2) The SFP in the multiplexer is malfunctioning.
3) There is a dirty connector on the fiber optic cable.
4) The fiber optic cable is bent in the management tray.

Answer 1

The most likely cause of the router interface not coming up after connecting to a DWDM could be either the wrong wavelength was demuxed or the SFP module in the multiplexer is malfunctioning. Issues relating to signal levels are less likely since a good signal level was confirmed.

Step-by-step explanation:

If a technician has connected a router to a DWDM (Dense Wavelength Division Multiplexing) system, confirmed a good signal level, but the interface on the router will not come up, the most likely causes could be:

1. The wrong wavelength was demuxed from the multiplexer.
2. The SFP in the multiplexer is malfunctioning.
3. There is a dirty connector on the fiber optic cable.
4. The fiber optic cable is bent in the management tray.

Among these options, if the signal level has been confirmed as good, it is less likely that a dirty connector or a bent cable is the issue, as these problems would typically affect signal levels. Thus, the most likely cause could be either the wrong wavelength being demuxed or a malfunctioning SFP (Small Form-factor Pluggable). These concerns address the light wavelength used to carry data and the interface module that transceives optical signals, respectively. It is essential to ensure compatibility between the router, the SFP module, and the DWDM system's expected wavelength for proper operation.