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{{Distinguish|optical add-drop multiplexer}}
An '''add-drop multiplexer''' ('''ADM''') is an important element of [[optical fiber]] networks. A [[multiplexer]] combines, or [[Multiplexing|multiplexes]], several lower-[[bandwidth]] streams of data into a single beam of [[light]]. An ''add-drop'' multiplexer is a multiplexer that has the capability to ''add'' one or more lower-bandwidth signals to an existing high-bandwidth data stream, and at the same time can extract or ''drop'' other low-bandwidth signals, removing them from the stream and redirecting them to some other network path. This is used as a local "on-ramp" and "off-ramp" to the high-speed network.
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