TIA's Glossary of Telecommunication Terms

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relative transmission level

The ratio of the signal power, at a given point in a transmission system, to a reference signal power. (188) Note: The ratio is usually determined by applying a standard test tone at zero transmission level point (or applying adjusted test tone power at any other point) and measuring the gain or loss to the location of interest. A distinction should be made between the standard test tone power and the expected median power of the actual signal required as the basis for the design of transmission systems.