Restore PoE to an Existing Ethernet Connection
When a network endpoint needs power but the existing Ethernet infrastructure does not provide PoE, the PowerDsine PD-3501G/AC provides a practical midspan solution without requiring a PoE-enabled network switch. This single-port Gigabit PoE injector adds 48V DC power at up to 15.4W to an Ethernet connection while supporting 10/100/1000 Mbps data transmission. The PD-3501G/AC belongs to the PowerDsine 3501G family and is designed around IEEE 802.3af PoE deployment. It is suitable for adding PoE capability to compatible IP phones, wireless LAN access points, network cameras, and other IEEE 802.3af-powered IP terminals. The midspan architecture allows the existing data network connection to remain in place while power is introduced through the Ethernet cable.
Application Scenarios
The PD-3501G/AC is intended for network installations where a compatible powered device requires PoE but the upstream Ethernet switch or network infrastructure does not provide it directly.
- IP Phone Deployment: Add PoE power to compatible IEEE 802.3af VoIP and IP telephone installations.
- Wireless Access Points: Supply power to compatible 802.3af WLAN access points while maintaining Gigabit Ethernet connectivity.
- Network Camera Installations: Provide PoE power to compatible 802.3af IP cameras where local AC power is inconvenient.
- Network Upgrades: Add PoE capability to an existing wired Ethernet connection without replacing the network switch.
Microchip's product documentation specifically identifies IP phones, WLAN access points, network cameras and other IP terminals as target applications for the PD-3501G PoE midspan family.
Technical Specifications
| Brand / Product Family | PowerDsine 3501G |
| Manufacturer | Microchip Technology / formerly Microsemi PowerDsine |
| Model / MPN | PD-3501G/AC |
| Product Type | Single-Port Gigabit PoE Midspan Injector |
| PoE Standard | IEEE 802.3af |
| AC Input Voltage | 90–264V AC |
| AC Input Frequency | 50/60Hz |
| PoE Output Voltage | 48V DC |
| Maximum Output Current | 320mA |
| PoE Power | 15.4W per port |
| Number of PoE Ports | 1 |
| Data Rate | 10/100/1000 Mbps |
| AC Input Connector | IEC 320-C14 |
| Ethernet Connectors | RJ45 |
| Mounting | Desktop |
| Operating Temperature | 0°C to +40°C |
| Dimensions | Approx. 140 × 53 × 32.5 mm |
The 15.4W rating refers to the PoE power delivered per port under the IEEE 802.3af implementation. The device also passes 10/100/1000 Mbps Ethernet data, making it suitable for Gigabit network connections rather than being limited to 10/100 Mbps environments.
Compatible Device Categories
- IEEE 802.3af IP Phones
- IEEE 802.3af WLAN Access Points
- IEEE 802.3af Network Cameras
- Compatible IP Network Terminals
No specific endpoint model is listed here because the available manufacturer/distributor documentation identifies application categories rather than providing a definitive model-by-model compatibility list. This avoids overstating compatibility with devices that may require a different PoE standard or power budget.
How the Replacement Logic Works
The PD-3501G/AC is not a conventional 48V DC wall adapter. It is a PoE midspan injector that receives AC mains power and Ethernet data, then supplies PoE power over the Ethernet connection to a compatible powered device. For replacement, the most important checks are the PD-3501G/AC model number, IEEE 802.3af requirement, single-port configuration, 15.4W PoE power budget and Gigabit Ethernet support. A higher-power PoE injector should not automatically be treated as an equivalent replacement, while a lower-power 802.3af injector may not provide sufficient power for the target endpoint. The powered device should be checked for its required PoE standard and power consumption before installation.
Frequently Asked Questions
What is the PowerDsine PD-3501G/AC?
It is a single-port Gigabit PoE midspan injector that adds IEEE 802.3af power to an Ethernet connection. It provides up to 15.4W of PoE power at 48V DC while supporting 10/100/1000 Mbps data transmission.
Is PD-3501G/AC a 48V AC adapter?
No. It accepts AC mains input and internally generates 48V DC PoE power that is delivered through an RJ45 Ethernet connection. It should therefore be listed and installed as a PoE midspan injector rather than a standard DC power adapter.
What devices can use this PoE injector?
The PD-3501G family is intended for compatible IEEE 802.3af IP phones, WLAN access points, network cameras and other IP terminals. The target device must support the appropriate PoE standard and remain within the 15.4W power budget.
Does PD-3501G/AC support Gigabit Ethernet?
Yes. The unit supports 10/100/1000 Mbps data rates, allowing it to be inserted into Gigabit Ethernet installations without reducing the specified data rate to 100 Mbps.
What AC power connector does this model use?
The PD-3501G/AC uses an IEC 320-C14 AC input connection. The Ethernet interfaces use RJ45 connectors.
The PowerDsine PD-3501G/AC is a single-port Gigabit PoE midspan injector that converts AC mains power into 48V DC PoE power at up to 15.4W for compatible IEEE 802.3af IP phones, WLAN access points, network cameras and other IP terminals. It supports 10/100/1000 Mbps Ethernet, uses an IEC 320-C14 AC input and RJ45 Ethernet connections, and is designed to add PoE capability to existing wired network infrastructure without replacing the network switch.
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