Add-drop multiplexer Add-drop multiplexer An add-drop multiplexer (ADM) is an important element of an optical fiber network. A multiplexer combines, or multiplexes, several lower-bandwidth streams of data into a single beam of light. An "add-drop" multiplexer also 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. ADMs can be used both in long-haul core networks and in
What is this Feeling? Through Life", Galinda's loathing of Elphaba is manifested yet again when, in order to embarrass her in front of everyone at the Ozdust Ballroom, she presents her with a pointed black hat, clearly representative of those traditionally associated with witchcraft, that Galinda received from her grandmother. However, Galinda's conscience soon starts to get the better of her, and in her remorse she approaches Elphaba with an invitation to dance, culminating in the pair eventually becoming friends in "Popular". Stephen Schwartz meant the song's title and lyrics to be an ironic parody on love songs ("What is this feeling so sudden