Reverse PoE (reverse PoE) technology, contrary to the traditional PoE logic, the switch'spower from other devicesenables it to work. Thus:
In locations not near an electrical outlet, devices can transfer both data and energy via cable.
Facility costs and cable complexity are reduced.
Models like Pnlink are typically used in ISP (Internet Service Provider) infrastructures, rooftop installations, or remote locations.
Below are the typical features of Pnlink's "reverse PoE" switches (example model:PN‑RP071P‑OD).
| 🏷 Feature | 🔍 Description |
|---|---|
| 🔌 Port Structure | 7 × 10/100 Mbps reverse PoE (PoE-in) port + 1 × uplink port (PoE-out / data output) |
| 💡 Input Voltage | Usually 24 V DC (with PoE injector) |
| 🔋 PoE Output | Passive 24V PoE output – power can be supplied to devices from the uplink port |
| 🌐 Swap / Switch Capacity | Generally simple L2 switching capabilities (MAC table, data transmission) |
| 🌤 Environment / Cash Register | Outdoor (OD) versions with weather-resistant housing (may have an IP rating) |
| 🛠 Additional Features | - Smart power management - Automatic PoE detection - PCB protection - Signal isolation - Reset / DIP switches |
🔌 Energy transmission without the need for an electrical outlet
📈 Savings in installation costs
📶 Both data and power transmission over long distances
🔄 Network expansions are facilitated with a modular structure.
🌍 Compatible devices (e.g., ONU, CPE, WiFi devices) can be directly powered.
Voltage mismatch:The incoming PoE voltage (for example, 24 V) must be compatible with the devices' requirements.
Power budget constraints:The power limit per port should be taken into account.
Passive PoE compatibility:It can operate with the passive PoE standard, not active PoE.
Cable quality:Cable quality (AWG value) affects signal and energy losses over long distances.
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