The range of Cisco 10GBASE XENPAK modules offers customers a wide variety of 10 Gigabit Ethernet connectivity options for data center, enterprise wiring closet, and service provider transport applications. Cisco 10GBASE XENPAK modules provide flexibility of interface choice and support 10GBASE Ethernet. These hot-swappable input/output devices plug into an Ethernet XENPAK port of a Cisco switch or router to link the port with the network and support the Cisco quality identification (ID) feature that enables a Cisco switch or router to identify whether the module is a Cisco certified and tested XENPAK module. Cisco 10GBASE XENPAK modules also support pay-as-you-populate model.