OTDR

A technician is troubleshooting a point-to-point fiber-optic connection.

The technician is at a remote site and has no connectivity to the main site.

The technician confirms the switch and the send-and-receive light levels are within acceptable range.

Both fiber SFPs are confirmed as working.

Which of the following should the technician use to reveal the location of the fault?

A.

OTDR

B.

Light meter

C.

Tone generator

D.

CSU/DSU.

A.

In this scenario, the technician is troubleshooting a point-to-point fiber-optic connection and has confirmed that the switch and the send-and-receive light levels are within acceptable range, and both fiber SFPs are working. However, there is still no connectivity to the main site, so the technician needs to locate the fault.

The correct answer is A. OTDR (Optical Time Domain Reflectometer). An OTDR is a device that uses fiber-optic technology to detect faults or breaks in a fiber-optic cable. It sends a pulse of light down the cable and measures the reflection of the pulse when it encounters a break or fault in the cable. This reflection is then analyzed to determine the location of the fault.

A light meter (answer B) is a device that measures the amount of light in a fiber-optic cable. It can be used to verify the signal strength and quality, but it cannot locate a fault in the cable.

A tone generator (answer C) is a device that can be used to trace a cable or wire. It sends a tone down the cable, and a receiver can be used to follow the tone and locate the cable. However, it is not effective for locating a fault in a fiber-optic cable.

A CSU/DSU (answer D) is a device used for connecting a digital data device (such as a computer) to a digital transmission line (such as a T1 line). It is not relevant to the troubleshooting of a fiber-optic connection.

Therefore, the most appropriate tool for the technician to use in this scenario is an OTDR.