Cisco Systems Power Adapter ADP-19FB (PSA18U-480C Variant) 19W USA Pre-Owned

Cisco Systems Power Adapter ADP-19FB (PSA18U-480C Variant) 19W USA Pre-Owned

The Cisco Systems Power Adapter model ADP-19FB / PSA18U-480C variant 19W USA Pre-Owned is a compact and efficient switching AC/DC power supply designed for Cisco IP phones and enterprise communication devices. It delivers stable 48V DC output (0.38A), making it suitable for powering VoIP phones and related Cisco networking hardware used in office environments.

Because it is part of Cisco’s enterprise communication ecosystem, this adapter is engineered for consistent voltage delivery, low interference, and reliable 24/7 operation. Additionally, it ensures that IP phones remain powered and fully operational in business-critical environments. Cisco power supplies like the PSA18U-480C are commonly used with Cisco 7900 series IP phones and Aironet devices.

As a result, this adapter is widely used in corporate offices, call centers, and enterprise communication setups where stability is essential.

Specifications

Stable 19W Power for Cisco Devices

This adapter provides 48V DC at 0.38A, delivering approximately 18–19 watts of regulated power, which is standard for Cisco IP phone systems. Because of this, it ensures stable operation of VoIP devices without interruptions or voltage drops.

Additionally, it maintains clean and consistent output. As a result, Cisco phones can function reliably for long hours of continuous communication.

The PSA18U-480C family is widely documented as an 18W, 48V power adapter used for Cisco IP phones and Aironet access points.

Designed for Cisco IP Phone Systems

This adapter is commonly used with:

• Cisco 7900 series IP phones (e.g., 7940, 7960)
• Cisco VoIP desk phones
• Aironet wireless access points
• Enterprise communication endpoints

Because of this, it is a standard power solution in office telephony environments and corporate communication systems.

Additionally, it is often used as a replacement adapter in IT departments maintaining Cisco phone infrastructure.

Efficient Switching Power Technology

The adapter uses switch-mode power supply (SMPS) technology, which improves efficiency and reduces energy loss. Additionally, it ensures stable voltage output even under continuous load.

Because of this design:

• Power delivery remains stable
• Heat generation is minimized
• Energy efficiency is improved

As a result, it is suitable for continuous enterprise use.

Built-In Safety Protection

This Cisco adapter includes multiple safety features designed to protect connected devices.

Key protections include:

• Over-voltage protection
• Over-current protection
• Short-circuit protection

Because of these protections, it helps maintain safe operation of sensitive IP communication hardware.

Wide Input Voltage Compatibility

The adapter supports 100–240V AC input, making it suitable for global deployment. Additionally, it automatically adjusts to different voltage standards.

Because of this:

• It works internationally
• No voltage converter is needed
• It supports enterprise environments

Therefore, it is flexible for global Cisco installations.

Compact and Office-Friendly Design

The ADP-19FB / PSA18U-480C adapter features a compact external power brick design, making it easy to install behind desks, phones, or network equipment.

Because of this:

• It reduces clutter in office setups
• It is easy to install and replace
• It supports clean cable management

Pre-Owned Condition – Fully Tested

This unit is USA Pre-Owned and fully tested.

Condition details:

• Fully functional
• Light cosmetic wear may be present
• No performance issues detected

Because of this, it offers a cost-effective alternative to purchasing a new Cisco adapter.

Ideal For

This adapter is suitable for:

• Cisco IP desk phones
• VoIP communication systems
• Enterprise office telephony
• Cisco Aironet devices
• Replacement or backup power supply

Reliable Cisco 48V Power Solution

The Cisco Systems ADP-19FB / PSA18U-480C 19W Power Adapter USA Pre-Owned delivers stable, efficient, and safe power for Cisco communication devices. It is designed for uninterrupted performance in professional environments where reliability matters.

Therefore, it is an excellent choice for users needing a dependable replacement power supply for Cisco IP phones and VoIP systems.