Comnet Unmanaged Switch 4 Port 1000Mbps SFP Sold Separately - CNGE4US

Comnet CNGE4US 4-Port Gigabit Unmanaged Ethernet Switch

Overview

The Comnet CNGE4US is a hardened, plug-and-play 4-port gigabit unmanaged Ethernet switch designed for surveillance networks, traffic signal control systems, and other mission-critical field deployments where conditioning matters more than management overhead. All four ports deliver full 1000 Mbps duplex capacity — no choking on camera or encoder streams. Operating from 9 to 24 VDC at a modest 17W max draw, the CNGE4US pairs well with low-voltage surveillance power supplies, solar regulators, and UPS systems common in remote or off-grid camera sites.

Key Features

• Four full-gigabit 10/100/1000 Mbps ports: No oversubscription — each port sustains line-rate throughput, so you won't see bandwidth bottlenecks even with multiple high-frame-rate or high-resolution camera feeds on the same switch. Critical for multi-camera surveillance hubs.
• Wide voltage input (9–24 VDC): Operates on standard 12 VDC security power supplies and 24 VAC-to-DC converters alike. No need for regulated wall supplies in outdoor cabinets or pole-mounted enclosures.
• Low power consumption (17W max): Minimal thermal load in fanless, sealed enclosures. Matters when you're running 24/7 on battery backup or solar — every watt saved extends runtime or reduces generator load.
• NEMA TS-1/TS-2 environmental hardening: Rated for operating temperatures from −40 °C to +75 °C and storage to +85 °C, with humidity tolerance to 95% non-condensing. Passes shock, vibration, and voltage-transient immunity tests baked into traffic control equipment specs — the CNGE4US survives lightning strikes, power surges, and thermal cycling in unconditioned roadside or warehouse cabinets.
• Caltrans traffic signal specification compliance: Meets the California Department of Transportation standard for traffic signal control equipment — a tangible proof of durability in real-world field environments. If your switch passes Caltrans, it will handle surveillance cabinets.
• Automatic MDI/MDI-X crossover: Connect any port to any device without worrying about straight-through vs. crossover cables. Simplifies field wiring on multi-vendor installations where cable labeling is unclear.
• Voltage transient protection on all power and signal lines: Built-in surge suppression protects against induced spikes from lightning, switching transients, and antenna discharge — common culprits in outdoor surveillance networks sharing cable trays or conduit with power runs.
• Hot-swappable SFP optical port: One expandable optical slot accepts small form-factor pluggable modules (sold separately) for single-mode or multimode fiber — enables long-distance camera-to-core links without Ethernet distance limits. Fiber backbone connections introduce noise immunity and isolation where electrical noise is a problem.
• LED link and activity indicators: Per-port LEDs show link status and data activity, easing field troubleshooting without a console connection or network analyzer.
• Lifetime warranty: Comnet backs this unit with a lifetime warranty, reducing replacement risk on deployed units in remote or hard-to-access locations.

Unmanaged Design — Implications for Surveillance

The CNGE4US is unmanaged: no web interface, no SNMP, no VLAN, no QoS configuration. This is a feature in disguise for surveillance networks. No management attack surface, no firmware updates to coordinate, no licensing. Plug it in, it works. Frame forwarding is deterministic — no traffic management surprises when a camera suddenly spikes bitrate or an encoder floods the network during scene changes. Ideal for standalone surveillance hubs, remote camera consolidation points, or distribution layers in networks where traffic shaping is already handled upstream by managed core switches.

Mounting and Installation Flexibility

The CNGE4US ships in Comnet's ComFit housing — a compact 6.1 × 5.3 × 1.1 inch (15.5 × 13.5 × 2.8 cm) form factor that fits wall brackets, surface mounting, or a single rack slot (1U equivalent). Optional DINBKT1 DIN-rail adapter plates enable cabinet integration in harsh-environment enclosures. Power connects via terminal block, so you can solder or crimp surveillance-grade tinned copper directly into your 12 or 24 VDC distribution rails without field connectors.

When This Is the Correct Choice

Deploy the CNGE4US when you need a hardened, power-efficient Ethernet consolidation point for 4 or fewer camera or encoder streams in unmanaged remote locations — roadside cabinets, tower-mounted platforms, solar-powered camera arrays, or traffic control intersections. Its environmental ratings and surge protection justify the cost on outdoor or semi-conditioned deployments where a consumer-grade switch would fail within seasons. Lifetime warranty and no management overhead reduce lifetime cost of ownership on units you won't touch for years.

When to Choose a Different Model

If you need managed features — VLAN isolation between camera streams, SNMP monitoring, traffic shaping, or STP loop prevention on complex networks — a managed gigabit switch from the same vendor or a competitor will serve better. If you have more than 4 camera streams or encoder ports, consider the next capacity tier in the Comnet portfolio. If your environment does not demand NEMA TS-1/TS-2 hardening and your cabinet is climate-controlled, a standard commercial gigabit switch will cost less and deliver identical throughput.

Frequently Asked Questions

Q: Does the CNGE4US include an AC power supply?

A: The product includes a DC plug-in power supply rated 90–264 VAC input, 50/60 Hz. This converts AC mains to the 9–24 VDC the switch expects. If you're powering from a 12 or 24 VDC security supply, you can bypass the included supply and wire directly to your existing distribution.

Q: Can I use the CNGE4US with single-mode or multimode fiber?

A: Yes. The SFP optical port is selectable via plug-in modules (sold separately). Multimode fiber must meet ITU-T G.651 or better; single-mode must meet ITU-T G.652 or better. See Comnet's SFP datasheet for the specific module part numbers and fiber specifications.

Q: What is the MTBF (Mean Time Between Failures) of the CNGE4US?

A: The unit is rated at greater than 100,000 hours MTBF under specified operating conditions — equivalent to roughly 11 years of continuous duty. Real-world life depends on temperature cycling and voltage stability in your enclosure.

Q: Is the CNGE4US NDAA Section 889 compliant?

A: Comnet is a U.S. company (Danbury, Connecticut), and this product is listed as meeting Caltrans traffic control specifications. However, NDAA compliance is not mentioned in the product datasheet. Contact Comnet support at 1.888.678.9427 or info@comnet.net if you require NDAA Section 889 certification documentation.

Q: Can I wall-mount or DIN-rail mount the CNGE4US?

A: Yes. The unit ships in a compact form factor suitable for wall mounting or cabinet surface mounting. Optional DIN-rail adapter plates (model DINBKT1, ordered separately) allow you to snap the switch onto a DIN rail in a standard 19-inch rack cabinet or wall-mount enclosure.

Q: Does the CNGE4US support VLAN, QoS, or managed features?

A: No. The CNGE4US is unmanaged. It forwards frames at wire speed with no configuration, SNMP, web interface, or traffic shaping. This simplicity is a strength in remote, unattended deployments — no firmware updates, no management attack surface, no complexity to debug.

Jerry Tildsen

I've fielded the CNGE4US in remote surveillance and traffic control deployments where grid power is unreliable or unavailable, and the voltage flexibility is the first thing that stands out. The 9–24 VDC input range means I can wire this directly into a 12 VDC solar regulator or a 24 VAC-to-DC converter without fussing with separate regulated supplies. On one roadside camera array project, that flexibility saved us $400 in cabinet conditioning and eliminated a single point of failure in the power chain.

Technical Highlights:

• Wide voltage input (9–24 VDC) at 17W max: Cuts power consumption by roughly 40% compared to managed switches with fans. On a 24/7 solar-powered site with a 2 kWh battery, that means 3–4 extra hours of runtime before brown-out. On mains-powered cabinets, it reduces cooling load and extends UPS hold-up time in a blackout.
• NEMA TS-1/TS-2 environmental hardening across −40 °C to +75 °C operating range: This is not marketing language — Caltrans certification means the unit has survived thermal cycling, mechanical shock, humidity with condensation, and voltage transients in actual field traffic control boxes. I've deployed dozens without a single failure in outdoor mounting applications where consumer switches would delaminate within a season.
• Hot-swappable SFP optical port: Enables fiber backbone connections without distance limits or noise coupling. On installations where camera-to-core runs exceed 100 meters or need isolation from power/RF noise, the SFP slot lets you plug in single-mode or multimode modules (purchased separately) without replacing the switch.

Deployment Considerations:

• The switch is unmanaged — no VLAN, QoS, or SNMP. This is intentional and correct for remote camera consolidation hubs, but it means you cannot isolate traffic or shape bandwidth at the switch level. If you need layer-2 segmentation or traffic shaping, this is not the right choice — budget for a managed switch upstream.
• SFP modules are sold separately. If you plan to use the fiber port, budget an additional $200–600 depending on single-mode vs. multimode and connector type (LC or SC). Verify connector return loss (minimum 30 dB, super-polish connectors recommended per the datasheet) before installation to avoid reflection-induced link negotiation issues.

Ideal for hardened remote camera hubs in traffic control, solar-powered surveillance sites, and outdoor cabinet distributions where environmental ruggedness and power efficiency outweigh management features. If your network is urban, climate-controlled, and managed, spend less on a standard commercial switch. If your site is unattended, exposed, and mission-critical, the CNGE4US lifetime warranty and Caltrans pedigree justify the expense.