Welcome to the ZyXEL Networking Glossary - your definitive source for descriptions of networking terms and ZyXEL's product features.
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Free-space optics uses line-of-sight transmissions of visible or infra-red light through Earth's atmosphere or outer space to communicate between devices. An everyday example of free-space optics is the IrDA standard that allows mobile devices such as cellphones or PDAs to exchange information across short distances. Longer-range free-space optical connections are often deployed for building-to-building communications, but can be susceptible to disruption by meteorological interference (such as clouds and rain).