Optical modules, including SFP (1G), SFP+ (10G), and SFP28 (25G), are compact, hot-pluggable transceivers that allow routers to connect to different physical media without replacing the router hardware . They convert electrical signals from the router into optical signals for fiber networks or vice versa, enabling high-speed data transmission over long distances . Modules are standardized through multi-source agreements (MSAs), ensuring interoperability across devices, though full compatibility depends on the router's firmware and PHY support .
Routers with SFP/SFP+ ports can use optical modules for both WAN and LAN connections. For example, a router connected to a fiber ISP can use an SFP+ ONU stick to replace a fiber modem, connecting directly to the ISP's fiber network . Within a local network, optical modules can link routers to high-speed switches, servers, or NAS devices, supporting high-bandwidth applications . Modules are hot-swappable, meaning they can be inserted or removed while the router is powered on, which simplifies maintenance and upgrades .
Small Form-factor Pluggable Small Form-factor Pluggable connected to a pair of fiber-optic cables Small Form-factor Pluggable
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