PWR-3900-POE Cisco 3925/3945 AC Power Supply with Power Over Ethernet PWR3900POE

Description:

The Cisco PWR-3900-POE Power Supply is used in Cisco 3925 and 3945 Integrated Services Router systems to provide AC power and integrated Power over Ethernet capability for connected network devices. Commonly installed in Cisco ISR G2 router deployments used in enterprise branch networks, corporate communication infrastructures, and unified communications environments requiring reliable router power and PoE support. Maintenance teams, network administrators, and system integrators use this power supply for hardware replacement, power system upgrades, and maintaining continuous operation of Cisco routers supporting enterprise networking and voice communication systems.

Applications:

The Cisco PWR-3900-POE power supply is deployed in enterprise networking environments where Cisco 3925 or 3945 Integrated Services Routers provide WAN connectivity and unified communications services. It is commonly used in branch office networks, enterprise WAN infrastructures, and business communication systems where routers must deliver stable system power and Power over Ethernet to connected devices such as IP phones and network equipment. Network engineers install this power supply during maintenance operations, infrastructure upgrades, or replacement of failed power modules to maintain reliable router performance.

Technical Specifications:

• Manufacturer Part Number (MPN): PWR-3900-POE
• Product Type: Router Power Supply with PoE capability
• Compatible Platforms: Cisco 3925 and Cisco 3945 Integrated Services Routers
• Input Voltage: 100–240V AC
• Frequency: 50–60 Hz
• Power Type: AC Power Supply with integrated Power over Ethernet
• Installation: Internal power supply module
• Function: Provides router system power and PoE capability for connected devices
• Application: Replacement or upgrade power supply for Cisco ISR 3900 Series routers
• Manufacturer: Cisco Systems

Common Replacements:

• Cisco PWR-3900-AC Power Supply
• Cisco PWR-3900-DC Power Supply
• Cisco PWR-3845-AC-IP Power Supply