What type of cable is wrapped multiple times in circles for testing purposes?

The correct choice indicates that the launch cable is specifically designed for testing purposes, particularly in the context of optical fiber networks. A launch cable is a section of fiber optic cable that is used to introduce light into a fiber optic system during testing. It typically allows for the measurement of various optical properties, such as insertion loss and bandwidth, by providing a controlled light source.

When testing, the launch cable is wrapped in circles to simulate conditions similar to those that the fiber will encounter in actual installation. This method helps to ensure that the testing parameters closely resemble real-world scenarios, allowing for accurate assessments of performance and ensuring quality within the network.

This practice can also help in identifying issues such as reflections or splice losses while ensuring that the measurements account for the impact of connectors and other components introduced in the testing setup. The circular wrapping in the testing environment can assist in avoiding excessive strain and bending of the fiber, thereby minimizing potential errors in testing results.

Other types of cables mentioned do not share the same testing focus or technique. The receive cable is generally used to accept signals, while fault detection cables are employed in different troubleshooting scenarios, and power cables relate to electrical distribution rather than testing optical systems.