The Cisco® 10GBASE X2 modules offer customers a wide variety of 10 Gigabit Ethernet connectivity options for data center, enterprise wiring closet, and service provider transport applications.Main features of Cisco 10GBASE X2 modules include:- Support 10GBASE Ethernet.- Hot-swappable input/output device plugs into an Ethernet X2 port of a Cisco switch or router to link the port with the network.- Provides flexibility of interface choice.- Supports "pay-as-you-populate" model.- Supports the Cisco quality identification (ID) feature that enables a Cisco switch or router to identify whether the module is certified and tested by Cisco.- Has optical interoperability with respective 10GBASE Xenpak, 10GBASE XFP and 10GBASE SFP+ modules on the same link.The Cisco 10GBASE-CX4 Module supports link lengths of up to 15m on CX4 cable.