X2 Optical Module Introduction
2017-07-03
X2 is a standardized package of the 10G optical transponders. X2 are available for both versions 10G Ethernet and 10G Fibre Channel. X2 optical transponder is only applied to the data communication optical fiber connection (not used in the telecommunications transmission network), and their size is smaller than XENPAK optical transponder. Electrical interface of board is standardized, be known as XAUI (4X3.125Gb / s).
 X2 Optical Module Introduction
X2 optical modules is evolved from the standard of XENPAK, and its internal functional modules are same to XENPAK basically, the circuit board applications are same too .that only need one optical module to achieve 10G Ethernet interface functions. As XENPAK optical modules put-on the board need to slot on the circuit board , so it will be achieve complex and can’t achieve high density applications. Improved X2 optical modules’ size only about half of XENPAK, can be directly put on the board, so apply to high-density rack systems and PCI card applications.
 
X2 optical modules are available in two circuit interfaces: XAUI and Serial Framer Interface (SFI-4), which can be used for 10G Ethernet and also can be used for OC-192 SDH and 10GFC. X2 compared to XPAK changes are mainly reflected in the rail system, the industry generally believe that the two specifications will be integrated together finally.

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