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The transmitter/studio link (or TSL) of a radio station or television station is a return link which sends telemetry data from the remotely-located radio transmitter or television transmitter back to the studio for monitoring purposes. The 'TSL may return the same way as the studio/transmitter link (STL), or it can be embedded in the station's regular broadcast signal as a subcarrier (for analog stations) or a separate data channel (for digital stations).
Analog or digital data such as transmitter power, temperature, VSWR, voltage, modulation level, and other status information are returned so that broadcast engineering staff can correct any problems as soon as possible. This data may be attended-to by an automated transmission system.
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