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
Is This What You Want? and distinctive voices which have the potential of turning its owner into a superstar". Leng attributes the album's underachievement to the Beatles' inexperience as label owners. He says that they relied too heavily on establishing their artists with a hit single and that, after "Sour Milk Sea" had failed to become a hit, this formula left "Is This What You Want?" without an adequate marketing strategy. The album was issued on CD for the first time in November 1991, with the inclusion of bonus tracks such as "New Day", "Thumbin' a Ride", "How the Web Was Woven" and "Won't You