The Cisco QSFP-40G-SR-BD is a bidirectional 40 Gigabit transceiver that works over standard duplex multimode fiber, the same type of fiber typically used for existing 10 Gigabit short reach links, rather than requiring the wider ribbon fiber some 40 Gigabit optics need. This makes it a practical way to upgrade an existing fiber link to 40 Gigabit without replacing the fiber itself. Antofity Concepts supplies the QSFP-40G-SR-BD for organisations in Kenya upgrading existing duplex fiber links to 40 Gigabit speed.