Welcome to the ZyXEL Networking Glossary - your definitive source for descriptions of networking terms and ZyXEL's product features.
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Line-of-sight (LOS) refers to a wireless signal (such as beamed microwave) where a transmitter must have an unobstructed, direct signal path to a receiver for data transfer to take place. A line-of-sight signal cannot pass through solid objects such as buildings, mountains or trees. In a WiMAX network, wireless links between base stations must be line-of-sight, whereas wireless links between a base station and its subscriber stations can be non-line-of-sight. See also Signal Absorption and Non-Line-of-Sight (NLOS).