Dahua DH-S3218-16ET-135 – Unmanaged PoE Switch, 16× PoE, 2× Gigabit Combo, 135 W

The Dahua DH-S3218-16ET-135 is an unmanaged 18-port switch with 16 PoE ports, designed for IP video surveillance systems. Its high-performance switching engine and large buffer keep video streams stable. Two red ports support IEEE802.3bt and Hi-PoE with up to 90 W per port, so they can also power high-consumption devices such as PTZ cameras. Four DIP switches turn on PoE watchdog, long-distance PoE, VIP port and port isolation.

Key features

• Ports: 16 × RJ45 10/100 Mbps with PoE (ports 1–16); 2 × Gigabit RJ45 10/100/1000 Mbps / SFP 1000 Mbps combo uplink ports (ports 17–18)
• PoE standards: IEEE802.3af, IEEE802.3at, IEEE802.3bt, Hi-PoE
• PoE power: ports 1–2 up to 90 W, ports 3–16 up to 30 W, total budget up to 135 W
• Long-distance PoE: up to 250 m at 10 Mbps (Cat5e/Cat6 cable)
• Functions (via DIP switches): PoE watchdog, VIP port, port isolation, long-distance PoE
• Switching capacity: 7.2 Gbps, packet forwarding rate 5.36 Mpps
• Buffer / MAC table: 4 Mbit / 8K entries, Jumbo frames up to 15 KB
• Standards: IEEE802.3, 802.3u, 802.3x, 802.3ab, 802.3z
• Management: unmanaged (plug & play), Layer 2
• Power: built-in power supply 100–240 VAC, 50/60 Hz; idle consumption ≤6 W, full load 154 W
• ESD protection: 8 kV air discharge, 6 kV contact discharge
• Operating temperature: –10 °C to +55 °C, humidity 5–95% (non-condensing)
• Housing: desktop design, also suitable for cabinet mounting (1U rack), dimensions 440 × 300 × 44 mm

The switch is a good choice for mid-sized video surveillance systems that need many PoE ports, a fast Gigabit uplink to the recorder or network, and power for high-consumption devices.