A device and method for operational switching between line-of-sight wireless communications transceivers requires evaluating a useful received signal strength intensity (RSSI) for a first transceiver, and switching to a second transceiver when the consequent bit error rate (BER) is not useful for the...http://www.google.com/patents/US6928248?utm_source=gb-gplus-sharePatent US6928248 - Optical communications system with back-up link
