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 Child Is This? years later in 1871, when it featured in "Christmas Carols Old and New", a "prestigious" and "influential" collection of carols that was published in the United Kingdom. The hymnal was edited by Henry Ramsden Bramley and John Stainer; even though it is not known with certainty who paired the three stanzas from "The Manger Throne" with the music from "Greensleeves", the third edition of "The Christmas Encyclopedia" by William D. Crump and "Stories of the Great Christmas Carols" both suggest that Stainer – who was also responsible for "harmoniz[ing] the musical setting" – may have done so. What Child Is