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Agere Systems, formerly known as the Microelectronics Group of Lucent Technologies and Agilent Technologies announced it on March 12th, 2001.
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 2.5Gbps circuits to 10Gbps.
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