Telecommunications information is often carried by

fiber-optic cable

Explanation:

Fiber optics, or optical fiber, refers to the medium and the technology associated with the transmission of information as light pulses along a glass or plastic strand or fiber. Fiber optics is used long-distance and high-performance data networking.

Fiber optics are also commonly used in telecommunication services such as internet, television and telephones. As an example, companies such as Verizon and Google use fiber optics in their Verizon FIOS and Google Fiber services, providing gigabit internet speeds to users.

Fiber optic cables are used since they hold a number of advantages over copper cables, such as higher bandwidth and transmit speeds.

the independent variable, or the one that is intentionally manipulated is the speed.

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