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The Cisco Nexus 5648Q with two expansion slots offers support for an additional twenty-four 40 Gigabit Ethernet ports using a hot-swappable generic expansion module (GEM). The Cisco Nexus 5648Q offers three fan modules for 2+1 redundancy and four 1+1 redundant power supplies, and supports both front-to-rear and reversible airflow options for flexible mounting.
Using Cisco's fabric extender (FEX) technology and cost-effective optics that allow the use of existing 10 Gigabit Ethernet fiber (a pair of multimode fiber strands), the Cisco Nexus 5648Q offers an optimal form factor for organizations upgrading their infrastructure from 10 Gbps to 40 Gbps. Please see the Cisco 40 Gigabit Modules QSFP data sheet for more details.