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Concept
Studio transmitter link
Summary
A studio transmitter link (or STL) sends a radio station's or television station's audio and video from the broadcast studio or origination facility to a radio transmitter, television transmitter or uplink facility in another location. This is accomplished through the use of terrestrial microwave links or by using fiber optic or other telecommunication connections to the transmitter site.
This is often necessary because the best locations for an antenna are on top of a mountain, where a much shorter radio tower is required, but where locating a studio may be impractical. Even in flat regions, the center of the station's allowed coverage area may not be near the studio location or may lie within a populated area where a transmitter would be frowned upon by the community, so the antenna must be placed at a distance from the studio.
Depending on the locations that must be connected, a station may choose either a point to point (PTP) link on another special radio frequency, or a newer all-digital wired link via a dedicated data transmission circuit. Radio links can also be digital, or the older analog type, or a hybrid of the two. Even on older all-analog systems, multiple audio and data channels can be sent using subcarriers.
Stations that employ an STL usually also have a transmitter/studio link (TSL) to return telemetry information. Both the STL and TSL are considered broadcast auxiliary services (BAS).
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 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.
Official source
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