1. Introduction
This manual provides essential information for the safe and effective use of your Onerbl 48V Power Supply. This power adapter is designed to provide reliable power to compatible Cisco IP Phones, specifically models within the 8800, 8900 (8961 only), and 9900 series.
2. Safety Information
Please read and understand all safety instructions before using this product. Failure to follow these instructions may result in electric shock, fire, or other hazards.
- Over Voltage Protection: The power supply is equipped with circuitry to protect against excessive voltage, safeguarding your connected devices.
- Over Heat Protection: Internal mechanisms prevent the power supply from overheating during operation.
- Short-Circuit Protection: Designed to prevent damage from short-circuit conditions.
- Do not expose the power supply to water, rain, or excessive moisture.
- Do not disassemble or modify the power supply. Refer all servicing to qualified personnel.
- Ensure the power supply is used within its specified input voltage range (AC 100-240V).
- Keep the power supply away from heat sources and ensure adequate ventilation.

Image: The power supply features multiple protection mechanisms, including short-circuit, over-voltage, and over-current protection, indicated by respective icons.
3. Package Contents
Verify that all items are present in the package:
- 1 x Onerbl 48V Power Adapter
- 2 x Power Cables (one integrated DC output cable, one AC input power cord)

Image: The Onerbl 48V Power Supply unit, featuring its integrated DC output cable and a separate AC input power cord. Key dimensions are indicated on the image.

Image: A close-up view of the AC input power cord, which connects the power adapter to a wall outlet.
4. Setup
Follow these steps to connect your Onerbl 48V Power Supply:
- Connect the AC input power cord to the power adapter. Ensure a secure connection.
- Plug the AC input power cord into a standard wall outlet (AC 100-240V, 50/60Hz).
- Connect the DC output cable from the power adapter to the designated power input port on your compatible Cisco IP Phone.
- Verify that the phone powers on.

Image: The power adapter is shown connected to a wall outlet and supplying power to a device, illustrating a typical setup.
5. Operating Instructions
The Onerbl 48V Power Supply operates automatically once connected correctly. It provides a stable 48V output to power your Cisco IP Phone. No user intervention is required during operation.
6. Maintenance
To ensure the longevity and proper functioning of your power supply:
- Keep the power supply clean and free from dust. Use a soft, dry cloth for cleaning.
- Avoid placing heavy objects on the cables or bending them sharply.
- Store the power supply in a cool, dry place when not in use.
- Regularly inspect the cables for any signs of damage. If damage is found, discontinue use and replace the unit.
7. Troubleshooting
If you encounter issues with your power supply, refer to the following common solutions:
- No Power to Phone:
- Ensure all cables are securely connected to the power adapter, wall outlet, and IP phone.
- Test the wall outlet with another device to confirm it is supplying power.
- Check for any visible damage to the power supply or cables.
- Intermittent Power:
- Ensure connections are firm and not loose.
- Avoid placing the power supply in areas with poor ventilation, which could lead to overheating and temporary shutdown.
If problems persist, contact the manufacturer or seller for further assistance.
8. Specifications
| Brand | Onerbl |
| Manufacturer | Shenzhen Waweis Technology Co., Ltd |
| Input Voltage | AC 100-240V, 50/60Hz |
| Output Voltage | 48 Volts |
| Connector Type | Proprietary |
| Compatible Devices | Cisco 8800, 8900, 9900 Series IP Phones |
| Compatible Phone Models | Cisco 8811, 8841, 8845, 8851, 8861, 8865, 8961, 9971, 9951 |
| Included Components | 1 x Power Adapter, 2 x Cables |
| Total Cable Length | Approximately 127.8 inches (324.6 cm) |

Image: Illustration highlighting the durable design and internal copper wire construction of the power cables, ensuring reliable power delivery.
9. Warranty and Support
Warranty information for this product is typically provided with your purchase documentation or can be obtained directly from the seller or manufacturer. For technical support or inquiries, please refer to the contact information provided by your retailer or the manufacturer, Shenzhen Waweis Technology Co., Ltd.