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? What is this Feeling? "What is this Feeling?" is a song from the hit musical "Wicked". It is sung between Elphaba, Galinda (later Glinda), and the students at Shiz University, expressing their loathing for each other's contrasting personalities as newly-assigned roommates. The song is performed towards the beginning of the first act. It opens with the two girls, Galinda and Elphaba, writing letters home to their parents in order to complain about their new rooming situation at Shiz University, brought about by Madame Morrible. During the song, Galinda and Elphaba graphically detail their mutual and "unadulterated loathing" toward one another.