Hot Standby:
A method of redundancy in which the primary and secondary (i.e., backup) systems run simultaneously. The data is mirrored to the secondary server in real time so that both systems contain identical information.
Frequency Diversity:
Frequency Diversity uses separate frequencies (dual transmit and receive systems).
It monitors primary for fail over and switches to standby.
Interference usually affects only one range of frequencies.
Not allowed in non-carrier applications because of spectrum scarcity.
Space Diversity:
Space Diversity protects against multi-path fading by automatic switch over to another antenna place below the primary antenna.This is done at the BER failure point or signal strength attenuation point to the secondary antenna that is receiving the transmitted signal at a stronger power rating.
