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? recovering. During this time, he read the Bible comprehensively and was inspired to author hymns like "Alleluia! Sing to Jesus!" and "As with Gladness Men of Old". The precise time in 1865 when he wrote the poem "The Manger Throne" is disputed. While the "St. Petersburg Times" details how Dix penned the work after reading the Gospel for Epiphany that year (Matthew 2:1–12) recounting the journey of the Biblical Magi; "Singer's Library of Song: Medium Voice" contends that it was actually authored during the Christmas of 1865. Although written in 1865, "What Child Is This?" was only first published six