XENPAK is amultisource agreement (MSA), instigated byAgilent Technologies andAgere Systems, that defines afiber-optic or wiredtransceiver module which conforms to the10 Gigabit Ethernet (10GbE) standard of theInstitute of Electrical and Electronics Engineers (IEEE)802.3 working group. The MSA group received input from both transceiver and equipment manufacturers during the definition process. XENPAK has been replaced by more compact devices providing the same functionality.
The XENPAK MSA was publicly announced on March 12, 2001 and the first revision of the document was publicly released on May 7, 2001. The most recent revision of the MSA, Issue 3.0, was published on September 18, 2002. The result covered allphysical medium dependent (PMD) types defined by the IEEE at that time for 802.3ae 10GbE.[1]
Although the XENPAK agreement received early support, its modules were thought to be overly large for high-density applications.[2] As of 2010[update], vendors generally changed to useXFP modules for longer distances, andEnhanced small form-factor pluggable transceivers, known asSFP+ modules, for higher densities.[3]The newer modules have a purelyserial interface, compared to the four "lane"XAUI interface used in XENPAK.[4]
XENPAK modules were supplied for physical layer interfaces supportingmulti-mode andsingle modefiber optic cables andInfiniBand copper cables with connectors known as CX4. Transmission distances vary from 100 metres (330 ft) to 80 kilometres (50 mi) for fiber and up to 15 metres (49 ft) on CX4 cable. Newer XENPAKs using the 10GBase-LX4 standard operated using multiple wavelengths on legacy multi-mode fibers at distances of up to 300 metres (980 ft), eliminating the need to reinstall cable in a building when upgrading certain 1 Gbit/s circuits to 10 Gbit/s.
The XENPAK form factor was initially supported by numerous network equipment manufacturers and module makers. However, advances in technology led to more compact form factors for 10 Gigabit Ethernet applications. Soon after the standard was introduced in 2001, two related standards emerged:XPAK andX2. These two standards have the same electrical interface as XENPAK (known asXAUI) but different mechanical properties.
The XPAK group was announced on March 19, 2002, first published their specification on May 24, 2002, and version 2.3 on August 1, 2003.[5]
The X2 group was announced on July 22, 2002, and published their specification on February 13, 2003.[6]Issue 3.0 of the XENPAK MSA was transferred to theSmall Form Factor committee as document INF-8474 on September 18, 2002.[7]
The XENPAK MSA website existed through the end of 2008.[1]
As of 2014, adapters are available that permit use of any modernSFP+ 10 Gbit/s optic in a XENPAK interface.[8]
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