Does the module require RS-FEC to operate at 25G?

Yes. RS-FEC must be enabled on the host port for operation at 25G.

What fiber type and maximum link length does this module support?

It supports a link length of up to 10 kilometers over standard single-mode fiber (SMF) G.652.

Questions & Answers: Cisco 10/25GBASE-LR SFP28 Module for SMF - 1 x LC/PC Duplex 25GBase-LR Network - Optical Fiber - Single-mode - 25 Gigabit Ethernet - 25GBase-LR - SFP-10/25G-LR-S=

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Cisco Systems, Inc.
Item#: 2AS-0016-007U4
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Cisco 10/25GBASE-LR SFP28 Module for SMF - 1 x LC/PC Duplex 25GBase-LR Network - Optical Fiber - Single-mode - 25 Gigabit Ethernet - 25GBase-LR - SFP-10/25G-LR-S=

For Data Networking, Optical Network
1 LC/PC Duplex 25GBase-LR Network
Optical Fiber
G.652 µm
Single-mode
25 Gigabit Ethernet
25GBase-LR

$2,978^.95 –