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Geostationary Fixed Satellite Service (GSO FSS)
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The "C-band" is the workhorse of the Geostationary Fixed Satellite Service (GSO FSS), with 3.7—4.2 GHz the downlink band and its associated uplink 5.925—6.425 GHz. More generally, the 4—8 GHz spectrum is designated as C-band.
Cable TV networks use the C-band to provide programming to cable systems. Program package providers directly serve viewers with home satellite dish receivers (Direct-to-Home FSS or DTH-FSS, a service also available in the Ku-band, see 11.7—12.2 GHz).
Many radio stations receive programming by C-band satellite, and international telephone and data traffic travel over the satellites of the International Telecommunications Satellite Organization (Intelsat) and its competitors in the 4/6 and 11/14 GHz bands.
The C-band also is used for tracking, telemetry, and control (TTC) of satellites while transferring them to final orbit position. Satellite operators want to expand TTC to adjacent spectrum (see 3.65—3.7 GHz).
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Paired Frequency Bands |
| Paired Bands | Use | Service | Table |
| 3700 - 4200 MHz | C-band GSO FSS Downlink | Fixed-satellite | N |
| 5925 - 6425 MHz | C-band GSO FSS Uplink | Fixed-satellite (Earth-to-space) | N |
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