12V Adapter for Router and ONU

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Specification

Key Specifications

Output Voltage (V): This is non-negotiable and must match exactly.
- Look for "Output: DC 12V" or "Input 12V" on your devices' labels.
- Using an adapter with the wrong voltage can permanently damage your device.
Output Current/Amperage (A or mA): The new adapter's current rating must be equal to or higher than your device's requirement.
- Common current ratings are 1A, 1.5A, 2A, or 2.5A (amperes).
- A device rated for 1.5A can safely use a 2A adapter, but not a 1A adapter (which would overheat and fail).
DC Plug Size: The physical size of the circular connector (barrel plug) must fit securely.
- The most common size for routers and ONUs is 5.5mm (outer diameter) x 2.1mm (inner diameter).
- Mismatched connector sizes are a common cause of physical damage.
Polarity: The internal wiring of the plug must match the device's requirements. Most devices use a "center-positive" configuration.
- This is typically indicated by a symbol on the label: a circle with a positive (+) sign in the middle and a negative (-) sign on the outside.