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The Cisco CWDM-SFP-1570 1000BASE-ZX Ethernet transceiver is a CWDM SFP transceiver for optical communications, rated for distances up to 80km and a maximum bandwidth of 1Gbps. The CWDM-SFP-1570 transceiver operates at 1570nm wavelength. A Cisco CWDM SFP is a hot-swappable input/output device that plugs into an SFP port or slot of a Cisco switch or router, linking the port with the fiber-optic network. The Cisco CWDM SFPs are multirate parts that support both Gigabit Ethernet and Fibre Channel (1 gigabit and 2 gigabit).