{"id":10294,"date":"2011-06-06T00:00:00","date_gmt":"2011-06-06T00:00:00","guid":{"rendered":"https:\/\/www.techopedia.com\/definition\/add-drop-multiplexer\/"},"modified":"2018-02-07T14:56:44","modified_gmt":"2018-02-07T14:56:44","slug":"add-drop-multiplexer","status":"publish","type":"definition","link":"https:\/\/www.techopedia.com\/definition\/24120\/add-drop-multiplexer-adm","title":{"rendered":"Add\/Drop Multiplexer"},"content":{"rendered":"<h2><span id=\"what_does_adddrop_multiplexer_mean\">What Does Add\/Drop Multiplexer Mean?<\/span><\/h2>\n<p>An add\/drop multiplexer (ADM) is a critical element of an optical fiber network. It can combine (i.e. multiplex) several low-bandwidth streams of data into a single light beam; and simultaneously, it can drop or remove other low-bandwidth signals from the stream of data and direct them to other network routes. The filtering technology used with ADM is called Fabry-P&eacute;rot etalon.<\/p>\n<p>Add\/drop multiplexers are also known as optical add\/drop multiplexers.<\/p>\n<h2><span id=\"techopedia_explains_adddrop_multiplexer\">Techopedia Explains Add\/Drop Multiplexer<\/span><\/h2>\n<p>Thank of an ADM as an on-ramp\/off-ramp to a high-speed optical fiber network.<\/p>\n<p>Add\/drop multiplexers can be used for both expensive long-haul core networks and shorter distance networks, called metro networks. The expense in long-haul core networks comes from adapting (i.e. scaling) the technology to the high-speed data rates and the dense wavelength division multiplexing (DWDM), i.e. a technology allowing a number of carrier signals of different wavelengths (or colors) of laser light to be carried on a single optical fiber.<\/p>\n<p>Recent changes in ADM technology, called multi-service provisioning platform (MSPP), is composed of equipment with legacy ADM equipment capabilities but with cross-functionality, allowing direct connections from local area networks (LANs) to an ISPs (Internet Service Providers) or other service provider&rsquo;s optical fiber backbone.<\/p>\n<p>Many carriers are investing in metro optical networks with an ever increasing variety of ADMs. Many of these are reconfigurable optical add-drop multiplexers (ROADMs) capable of remotely switching data traffic from a wave-length division multiplexing (WDM) system at the wavelength layer, i.e. switching based on wavelength.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>What Does Add\/Drop Multiplexer Mean? An add\/drop multiplexer (ADM) is a critical element of an optical fiber network. It can combine (i.e. multiplex) several low-bandwidth streams of data into a single light beam; and simultaneously, it can drop or remove other low-bandwidth signals from the stream of data and direct them to other network routes. [&hellip;]<\/p>\n","protected":false},"author":7813,"featured_media":0,"comment_status":"open","ping_status":"closed","template":"","format":"standard","meta":{"_acf_changed":false,"_lmt_disableupdate":"","_lmt_disable":"","om_disable_all_campaigns":false,"footnotes":""},"definitioncat":[219,248],"class_list":["post-10294","definition","type-definition","status-publish","format-standard","hentry","definitioncat-networks","definitioncat-networking-hardware"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v23.8 (Yoast SEO v23.8) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>What is a Add\/Drop Multiplexer (ADM)? - Definition from Techopedia<\/title>\n<meta name=\"description\" content=\"This definition explains the meaning of Add\/Drop Multiplexer and why it matters.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.techopedia.com\/definition\/24120\/add-drop-multiplexer-adm\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Add\/Drop Multiplexer\" \/>\n<meta property=\"og:description\" content=\"This definition explains the meaning of Add\/Drop Multiplexer and why it matters.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.techopedia.com\/definition\/24120\/add-drop-multiplexer-adm\" \/>\n<meta property=\"og:site_name\" content=\"Techopedia\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/techopedia\/\" \/>\n<meta property=\"article:modified_time\" content=\"2018-02-07T14:56:44+00:00\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:site\" content=\"@techopedia\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.techopedia.com\/definition\/24120\/add-drop-multiplexer-adm#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.techopedia.com\/definition\/24120\/add-drop-multiplexer-adm\"},\"author\":{\"name\":\"Margaret Rouse\",\"@id\":\"https:\/\/www.techopedia.com\/#\/schema\/person\/f5dd538e31ee352d105b8af36c4268a5\"},\"headline\":\"Add\/Drop Multiplexer\",\"datePublished\":\"2011-06-06T00:00:00+00:00\",\"dateModified\":\"2018-02-07T14:56:44+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.techopedia.com\/definition\/24120\/add-drop-multiplexer-adm\"},\"wordCount\":266,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/www.techopedia.com\/#organization\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.techopedia.com\/definition\/24120\/add-drop-multiplexer-adm#respond\"]}],\"articleSection\":\"\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.techopedia.com\/definition\/24120\/add-drop-multiplexer-adm\",\"url\":\"https:\/\/www.techopedia.com\/definition\/24120\/add-drop-multiplexer-adm\",\"name\":\"What is a Add\/Drop Multiplexer (ADM)? 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