TABLE OF CONTENTS Level: 2
Definition: A segment or portion of the electromagnetic spectrum that has been allocated on a shared basis for satellite and terrestrial microwave transmissions. C-band spectrum extends from 3.4 to 6.4 GHz. C-band satellite transmissions require use of large transmitting antennas to uplink signals to satellites in geosynchronous orbit and relatively large receiving antennas (3 to 5 feet), often referred to as television receive-only (TVRO) antennas. Use of TVROs began in the 1980s to receive satellite-delivered cable programming, creating the so-called backyard antenna (or TVRO) market. (See Table C 1 and see also Clarke Belt, Geostationary, and Spectrum Frequency.)
| Letter Band | Designated Frequency (Ghz) |
|---|---|
| C-band | 4 8 |
| K-band | 18 27 |
| Ka-band | 27 40 |
| Ku-band | 12 18 |
| L-band | 1 2 |
| Q-band | 20 46 |
| S-band | 2 4 |
| V-band | 40 75 |
| W-band | 75 110 |
| X-band | 8 12 |
Level: 3
Definition: A data transmission that can be represented by a nonvarying, or continuous, stream of bits or cell payloads. Applications such as voice circuits generate CBR traffic patterns. CBR is an ATM service type in which the ATM network guarantees to meet the transmitter s bandwidth and quality-of-service (QoS) requirements.
Used in a sentence: Because we were planning to offer so many voice and video services over our local network, we had to make sure the system could deliver a constant bit rate quality of service. (See...
