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Add-Drop Multiplexer Add-drop multiplexer Add-Drop-Multiplexer 塞取多工機 Add-drop multiplexor
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塞取多工機（ADM, Add-Drop Multiplexer）是電信傳輸網路中很重要的元件。將許多低頻寬的信號合在一起成為一個高頻寬的信號。而塞取多工機具有將低頻寬信號「塞進」（add）一個既有的高頻寬信號流，以及從一個既有的高頻寬信號流「取出」（drop）其中的低頻寬信號。就像是汽車要行駛進高速公路上或者駛離高速公路一般，塞取多工機的功用類似於高速網路中的交流道一般。 ADM可以用在長距離的中以及短距離的都會網路。近來的ADM被稱為「多服務SONET/SDH」（或者是）設備，除了包含傳統ADM的功能，更有電路交接功能。多服務ADM不僅可以取代傳統ADM設備，也可以連上乙太網路，提供區域網路的功能。 在2003年底，由於SONET/SDH網路的成長，多服務ADM的銷售量超越傳統ADM。在營運商不斷投資下又發展出新興的ADM稱之（ROADM, Reconfigurable Optical Add-Drop Multiplexer）。 Un Add-Drop Multiplexer o ADM è un elemento di rete nei sistemi di trasmissione sincrona SDH/SONET e nelle reti ottiche di tipo WDM (in quest'ultimo caso si parla anche di Optical Add-Drop Multiplexer o OADM). 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. Ein Add-Drop-Multiplexer ist ein Gerät der Multiplextechnik, das einem Multiplexsignal sowohl ein oder mehrere Teilsignale hinzufügen (add) und auch aus dem Multiplexsignal Teilsignale entnehmen (drop) kann. Das empfangene Multiplexsignal wird bis auf diese Add/Drop-Änderungen unverändert weitergesendet. Der Add-Drop-Multiplexer gilt somit als Erweiterung des herkömmlichen Multiplexers, der nur als Terminal-Multiplexer, am Ende von Übertragungsstrecken, eingesetzt wird.
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塞取多工機（ADM, Add-Drop Multiplexer）是電信傳輸網路中很重要的元件。將許多低頻寬的信號合在一起成為一個高頻寬的信號。而塞取多工機具有將低頻寬信號「塞進」（add）一個既有的高頻寬信號流，以及從一個既有的高頻寬信號流「取出」（drop）其中的低頻寬信號。就像是汽車要行駛進高速公路上或者駛離高速公路一般，塞取多工機的功用類似於高速網路中的交流道一般。 ADM可以用在長距離的中以及短距離的都會網路。近來的ADM被稱為「多服務SONET/SDH」（或者是）設備，除了包含傳統ADM的功能，更有電路交接功能。多服務ADM不僅可以取代傳統ADM設備，也可以連上乙太網路，提供區域網路的功能。 在2003年底，由於SONET/SDH網路的成長，多服務ADM的銷售量超越傳統ADM。在營運商不斷投資下又發展出新興的ADM稱之（ROADM, Reconfigurable Optical 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 shorter-distance "metro" networks, although the former are much more expensive due to the difficulty of scaling the technology to the high data rates and 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 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 LANs 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. An emerging variety of ADMs that is becoming popular as the carriers continue to invest in metro optical networks are reconfigurable optical add-drop multiplexers (ROADMs). Ein Add-Drop-Multiplexer ist ein Gerät der Multiplextechnik, das einem Multiplexsignal sowohl ein oder mehrere Teilsignale hinzufügen (add) und auch aus dem Multiplexsignal Teilsignale entnehmen (drop) kann. Das empfangene Multiplexsignal wird bis auf diese Add/Drop-Änderungen unverändert weitergesendet. Der Add-Drop-Multiplexer gilt somit als Erweiterung des herkömmlichen Multiplexers, der nur als Terminal-Multiplexer, am Ende von Übertragungsstrecken, eingesetzt wird. Un Add-Drop Multiplexer o ADM è un elemento di rete nei sistemi di trasmissione sincrona SDH/SONET e nelle reti ottiche di tipo WDM (in quest'ultimo caso si parla anche di Optical Add-Drop Multiplexer o OADM).
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