High Quality Content by WIKIPEDIA articles! XENPAK is a Multisource Agreement (MSA), instigated by Agilent Technologies and Agere Systems that defines a fiber-optic or copper transceiver module which conforms to the 10 Gigabit Ethernet (10GbE) standard as laid down by the IEEE 802.3ae. The MSA group received input from both transceiver and equipment manufacturers during the definition process. XENPAKs come in a variety of physical layer interfaces, supporting multi-mode and single mode fiber optic cables and CX4 InfiniBand copper cables. Transmission distances vary from 100 metres to 80 kilometres for fiber and up to 15 metres on CX4 cable. 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.

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