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A tone generator is typically used to generate tones in a cable for testing purposes. This device produces specific audio frequencies or tones that can be sent through the cable, allowing technicians to verify that the cable is functional and properly routed. The tones help in identifying cable faults, ensuring continuity, and facilitating the tracing of cables within walls or other inaccessible areas.

When using a tone generator, the generated tone travels through the cable, and technicians can use a tone probe to detect the sound at different points along the cable path. This process is crucial for troubleshooting and maintaining telecommunications infrastructure, ensuring that signals can pass through the cables without interference or loss.

The other devices mentioned, while useful in their respective areas, do not serve the primary purpose of generating tones for cable testing. A multimeter measures voltage, current, and resistance but does not generate tones. An oscilloscope visualizes electrical signals but does not produce tones. A signal analyzer is used to analyze the quality and parameters of signals but, similarly, does not create tone signals for the testing of cables.