Add-drop multiplexer: Difference between revisions

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ADMs can be used both in long-haul core networks and in shorter-distance "[[Metropolitan area network|metro]]" networks]], although the former are much more expensive due to the difficulty of scaling the technology to the high data rates and [[wavelength division multiplexing|dense wavelength division multiplexing]] (DWDM) used for long-haul communications. The main optical filtering technology used in add-drop multiplexers is the [[Fabry–Pérot etalon]].

Newer "multi-service [[SONET/SDH]]" (also known as a [[multi-service provisioning platform]] or MSPP) equipment has all the capabilities of legacy ADMs, but can also include cross-connect functionality to manage multiple fiber rings in a single chassis. These devices can replace multiple legacy ADMs and also allow connections directly from [[Ethernet]] [[LAN]]s to a service provider's optical backbone. At the end of 2003, sales of multiservice ADMs exceeded those of legacy ADMs for the first time, as the change to next-generation SONET/SDH networks accelerated.

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== See also ==

* [[Optical add-drop multiplexer]]

* [[Drop and insert]]

== References ==

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