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Overview
The Dahua DH-S3218-16ET-135 (DH-PFS3218-16ET-135) is an 18-port unmanaged PoE switch designed for CCTV surveillance networks, IP telephony, and commercial connectivity. Featuring 16 Fast Ethernet PoE downlink ports and dual Gigabit RJ45/SFP combo uplink ports, it delivers reliable power distribution and high-bandwidth uplink data transmission for small to medium enterprise deployments.
Equipped with intelligent PoE management features—including IEEE 802.3bt / Hi-PoE power delivery, PoE Watchdog, Port Isolation, and Long-Distance PoE transmission—the DH-S3218-16ET-135 ensures smooth, uninterrupted video streaming for security infrastructure.
Key Features & Highlights
- High Power Output (IEEE 802.3bt / Hi-PoE): Ports 1–2 support up to 90W (IEEE 802.3bt / Hi-PoE) for power-hungry devices like heavy-duty PTZ cameras, while Ports 3–16 deliver up to 30W (IEEE 802.3at/af) with a total power budget of 135W.
- Dual Gigabit Combo Uplinks: Features 2 × Gigabit RJ-45 copper ports and 2 × Gigabit SFP optical slots (Combo) for high-speed connectivity to NVRs or core network backbones over long distances.
- PoE Watchdog (PD Alive): Real-time monitoring automatically detects unresponsive connected IP cameras and reboots the individual PoE port without interrupting the rest of the network.
- Long-Distance Transmission: DIP switch mode enables extended PoE and data transmission up to 250 meters over standard Cat5e/6 cabling (at 10 Mbps).
- Port Isolation (VLAN Mode): Isolates downlink ports from each other to prevent broadcast storms and unauthorized cross-port communication while maintaining uplink routing.
- VIP Port Prioritization: Prioritizes traffic on Ports 1 to 8 to prevent packet loss during heavy bandwidth spikes or network congestion.
- Surge Protection: Built-in surge protection (4 kV common mode, 2 kV differential mode) and electrostatic discharge (ESD) protection safeguard equipment against electrical fluctuations.
Technical Specifications
| Feature | Specification |
| Model | DH-S3218-16ET-135 / DH-PFS3218-16ET-135 |
| Switching Type | Unmanaged (Layer 2) |
| Downlink Ports | 16 X RJ-45 (10/100 Mbps PoE) |
| Uplink Ports | 2 X RJ-45 (10/100/1000 Mbps) / 2 X SFP (1000 Mbps) Combo |
| PoE Standards | IEEE 802.3af, IEEE 802.3at, Hi-PoE, IEEE 802.3bt |
| PoE Power Budget | 135W Total (Ports 1–2: ≤ 90W / Ports 3–16: ≤ 30W) |
| Switching Capacity | 7.2 Gbps |
| Packet Forwarding Rate | 5.36 Mpps |
| MAC Address Table | 8K |
| Power Supply | Internal AC 100V–240V, 50/60 Hz |
| Operating Temperature | -10°C to +55°C (+14°F to +131°F) |
| Casing & Installation | Metal enclosure; Rackmount (1U) or Desktop installation |
| Dimensions (L × W × H) | 440 mm x 220 mm x 44 mm |
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