XENPAK
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XENPAK is a standard that defines a type of fiber-optic transceiver modules which are compatible with the 10 Gigabit Ethernet (10GE)) standard.
XENPAKs come in a variety of physical layer interfaces, for multi-mode and single mode fibre optic cables. Transmission distances vary from 100 metres to 80 kilometres. Recently introduced XENPAKs using the 10GBase-LX4 standard operate using multiple wavelengths on legacy multi-mode fibres at distances of up to 300 metres, eliminating the need to reinstall cable in a building when upgrading certain 1 Gbit/s circuits to 10 Gbit/s.
Since the standard was introduced in 1991, two successor standards emerged. XPAK and X2. These two standards have the same electrical interface as XENPAK but different mechanical properties (such as size and weight).
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