Comnet 4 Port Self-Managed Switch 10/100 Mbps Ethernet 4TX (Copper) - CNFE4SMS

Comnet CNFE4SMS 4-Port 10/100 Mbps Ethernet Self-Managed Switch

Overview

The Comnet CNFE4SMS is a four-port 10/100 Mbps Ethernet switch purpose-built for network switches in surveillance and IP video deployments where simplicity and reliability matter more than managed complexity. This is a plug-and-play device—no programming, no in-field configuration. The CNFE4SMS arrives pre-programmed with port 4 designated as the uplink port, preventing network video flooding by design. DIP switch selection lets you flip between uplink mode or run it as a fully unmanaged switch if your topology changes. That flexibility saves you from swapping hardware mid-deployment.

Key Features

• 4 × 10/100 Mbps RJ45 Ports: Each port auto-negotiates between 10 Mbps and 100 Mbps, full or half duplex, without manual intervention. In a typical surveillance network with three IP cameras and a recorder, the switch handles 100 Mbps aggregation cleanly. If you're running 24/7 streaming from four cameras, you get predictable, collision-free switching at wire speed—no packet loss from congestion.
• Pre-Programmed Uplink Port: Port 4 is factory-assigned as the uplink by default. This prevents loop-back and broadcast storms that can choke a network. The DIP switch lets you disable this if you need all four ports as access ports; no soldering or firmware reflashing required.
• Automatic MDI/MDI-X Crossover: Straight-through or crossover cable detection is automatic. You don't need to hand-label cables or worry about wiring standards—just plug in and it works. Real time saver on a warehouse floor or in a retrofit where cable stock is mixed.
• Voltage Transient Protection: All power and signal lines are protected against surges and transient voltage spikes. In environments with aging electrical infrastructure or frequent lightning activity, this protection keeps the switch alive when lesser devices would fail. The automatic resettable current limiters add a second layer of defense without requiring a technician to replace fuses.
• Operating Temperature -40°C to +75°C (-40°F to +167°F): Designed for outdoor pedestals, unheated storage areas, and sun-exposed equipment cabinets. The wide operating range means you don't need a separate climate-controlled enclosure in most US climates. Storage tolerance extends to +85°C, handling temporary excursions during shipping or sun soak.
• 12W Max Power Consumption at 9–24 VDC Input: Accepts any industrial 12V or 24V supply in your cabinet, no special PSU required. The included 90–264 VAC DC plug-in supply means you can power it from building mains if needed. At 12W max, even a small 5-amp 24V supply in a distributed cabinet has no problem running four of these switches plus cameras.

Integration & Compatibility

The CNFE4SMS is IEEE 802.3 compliant and ships with full duplex and half duplex capability—compatible with any IP camera or video encoder that supports standard Ethernet. Because it's unmanaged (or self-managed via DIP switch), there's no SNMP, no CLI, no VMS integration headaches. Drop it between your edge cameras and your network video recorder or core switch, and it simply works. In multicast surveillance networks (where multiple cameras broadcast video to multiple clients), the uplink prevents the typical broadcast amplification problem. It's particularly valuable in modular camera clusters where you have 3–4 cameras at a remote site feeding back to a central NVR.

Physical & Environmental

Dimensions are 6.1 × 5.3 × 1.1 inches, making it small enough to DIN-rail mount inside a compact pole-top cabinet or wall-mount directly on a surface. Weight under 2 lbs means minimal stress on brackets or shelf hardware. Relative humidity tolerance is 0–95% (non-condensing), suitable for outdoor equipment shelters and semi-sealed enclosures. MTBF exceeds 100,000 hours—equivalent to over 11 years of continuous operation—making it a background device you don't think about until it's gone. LED indicators for power and link/activity give you visual confirmation that traffic is flowing, useful during commissioning or troubleshooting.

Mounting & Installation

Wall or flat-surface mount screw attachment is standard. If you need DIN-rail installation, order the optional DINBKT1 mounting adapter kit separately. The conformal coating option (suffix '/C') extends operation into condensation environments—useful in unheated outdoor shelters or agricultural settings, though consult the factory for lead time and pricing on that variant.

What's in the Box

• 1× Comnet CNFE4SMS 4-port switch
• 1× DC plug-in power supply (90–264 VAC input, 50–60 Hz)
• 1× Mounting hardware (wall screw attachment)

Frequently Asked Questions

Q: Does the CNFE4SMS require any programming or configuration?

A: No. The CNFE4SMS is pre-programmed at the factory with port 4 set as the uplink. It is plug-and-play out of the box. You can change the mode via DIP switch selection if you need all four ports as access ports, but no field programming is required.

Q: Can I use the CNFE4SMS in an outdoor environment?

A: Yes. The operating temperature range of -40°C to +75°C and relative humidity up to 95% (non-condensing) make it suitable for outdoor equipment shelters, pole-top cabinets, and unheated buildings. For condensation environments, order the '/C' conformal-coated variant.

Q: What power supply do I need for the CNFE4SMS?

A: The CNFE4SMS accepts 9–24 VDC input and draws a maximum of 12W. It includes a 90–264 VAC DC plug-in supply. In a cabinet with other 12V or 24V devices, any standard industrial supply rated for a few amps will support multiple switches.

Q: Is the CNFE4SMS managed or unmanaged?

A: It is self-managed via DIP switch. There is no SNMP, telnet, or web interface. It operates in either uplink mode (port 4 as uplink, ports 1–3 as access) or fully unmanaged mode (all four ports equal). No VMS integration or monitoring software is needed.

Q: What is the warranty on the CNFE4SMS?

A: Comnet provides a lifetime warranty on the CNFE4SMS.

Q: Can I DIN-rail mount the CNFE4SMS?

A: The CNFE4SMS ships with wall or flat-surface mounting hardware. DIN-rail mounting requires the optional DINBKT1 adapter kit, which includes mounting hardware and must be ordered separately.

James Everett

I've deployed the CNFE4SMS in edge-of-network camera clusters where you need simple, reliable switching without the overhead of managed equipment. The pre-programmed uplink on port 4 is the real value here—it stops broadcast storms before they start. In a typical three-camera remote site feeding back to a central NVR, the CNFE4SMS sits between the cameras and the uplink to your core network. No configuration, no training, no remote management needed. It just works for years.

Technical Highlights:

• Auto-Negotiation 10/100 Mbps with Full/Half Duplex: Each port figures out the correct speed and duplex without you touching a switch. In mixed camera deployments (some older 10 Mbps sensors, newer 100 Mbps units), the CNFE4SMS handles the negotiation cleanly. No collisions, no manual duplex forcing.
• Voltage Transient Protection on All Power and Signal Lines: Automatic resettable current limiters protect against the power surges and transient spikes you get in outdoor cabinets and electrical closets. I've seen lesser switches fail after a single lightning strike nearby; the CNFE4SMS is built to absorb that punishment and keep running.
• -40°C to +75°C Operating Range with MTBF >100,000 Hours: In unheated outdoor pedestals and semi-sealed equipment shelters across the northern US, you don't need climate control. The switch survives sub-zero winters and high-temp summer sun. Over 11 years MTBF means this is a set-it-and-forget-it background device.

Deployment Considerations:

• The DIP switch uplink mode prevents broadcast loops, but you must commit to that topology at install time. If you later need all four ports as access ports (star topology instead of hierarchical), you'll flip the DIP switch—simple enough, but confirm your network diagram before mounting.
• This is a 10/100 switch, not Gigabit. If you're running high-bitrate 4K or 5MP video from four cameras simultaneously at 30 fps, you're right at the edge of 100 Mbps aggregate capacity. For bandwidth-heavy sites, step up to a Gigabit variant or use the CNFE4SMS only for the remote edge cluster and switch to a faster core.

The CNFE4SMS shines in distributed warehouse and logistics deployments where you have remote camera pods (3–4 cameras per location) feeding centralized NVRs over copper runs up to 100 meters. No managed switch overhead, no SNMP polling, no 'did the switch go down?' questions at 2 AM. Just reliable switching.