Tones and Bandwidth Combinations
Conversations using Olivia are by convention initiated using either Olivia 16/500 (16 tones over a 500 Hz bandwidth) or Olivia 32/1000 (32 tones over a 1000 Hz bandwidth). Once communications have been established, the communicating parties mutually decide if another mode would better suit the current propagation conditions. The possible number of tones that can be chosen are 2, 4, 8, 16, 32, 64, 128, and 256 with higher numbers of tones giving more data redundancy but slower throughput and lower numbers of tones giving faster throughput at the cost of less redundancy. Available bandwidths for Olivia are 125 Hz, 256 Hz, 512 Hz, 500 Hz, 1000 Hz, and 2000 Hz with wider bandwidths giving faster throughput and narrower bandwidths giving slower throughput. The most commonly used combinations are 4/125, 8/250, 8/500, 16/500, 16/1000, and 32/1000.
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