Technical Information
The C450 standard was developed by Siemens in 1980. It is a 1G analog cellular standard that utilized non-audible in-band signaling, audio scrambling via band-inversion and cell network call queuing when congested. Cellular nodes varied in size, supporting a primary cell size of 15-20 km and micro-cells of 2-3 km in size. Channel bandwidth was typically 20 kHz, although it could be operated in a narrow-band mode of only 12 kHz. As its name implies, it was designed for the 450 MHz UHF frequency range.
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