Comnet Four-Port Intelligent Self-Managed Ethernet Switch with Light Management - CNGE2+2SMSPOEHO

Comnet CNGE2+2SMSPOEHO Four-Port Gigabit Managed Ethernet Switch with PoE+

Overview

The Comnet CNGE2+2SMSPOEHO is a four-port managed Ethernet switch purpose-built for network surveillance infrastructure where you need intelligent traffic management, redundant power inputs, and the ability to deliver PoE+ power to two cameras or access points without external injectors. Two copper gigabit ports handle PoE+ delivery (up to 60W total across ports 1 and 2), while two SFP fiber ports provide uplink flexibility to a core switch or backbone — useful in longer-distance or electromagnetically noisy installations. The managed architecture means SNMP monitoring, RSTP ring redundancy, and LLDP neighbor discovery are available out of the box, making this switch a practical fit for mid-scale network video recorder deployments where you cannot tolerate a single point of failure.

Key Features

• 60W PoE+ on Ports 1–2: Delivers up to 30W per port (802.3at+) to power two full-featured IP cameras, access control readers, or wireless access points without requiring separate midspan injectors. At 60W combined, you're supporting two higher-draw devices (like 25W PTZ cameras or multi-sensor domes) on a single switch — meaningful when you're building distributed edge infrastructure.
• Dual SFP Fiber Uplinks: Two 100/1000 BASE-FX SFP ports let you extend to a backbone switch or NVR via single-mode or multimode fiber, eliminating copper cable runs over 100 meters and bypassing electrical noise in electrically noisy environments (parking structures, manufacturing floors, RF-heavy warehouses).
• Managed Switch Intelligence: RSTP (Rapid Spanning Tree Protocol) enables ring redundancy — if one switch link fails, traffic reroutes in milliseconds without intervention, keeping your camera stream and alarm data flowing. SNMP v1/v2c/v3 monitoring lets your NOC tools track port state, temperature, and power status. LLDP neighbor discovery simplifies commissioning by auto-advertising device presence.
• Jumbo Frame Support (10K bytes): Supports frames up to 10,000 bytes, enabling more efficient video streaming over the network — lower CPU overhead on the switch and smoother playback on large-frame H.265 streams or high-bitrate multi-sensor feeds.
• Dual Redundant AC/DC Inputs: Both 100–240V AC and 24V DC power inputs are active simultaneously with automatic failover. If your AC line drops, the 24V feeds the switch without interruption — essential in facilities running 24V UPS backup or distributed 24V power rails where you cannot afford a data loss window.
• Voltage Transient Protection & Auto-Reboot: Integrated surge protection and watchdog timer prevent lightning strikes or power spikes from freezing the switch. If the CPU hangs, the device reboots itself automatically — real uptime insurance for remote or unattended edge locations.

Integration & Compatibility

The CNGE2+2SMSPOEHO integrates with any ONVIF-compliant IP camera (Axis, Hikvision, Bosch, Pelco, Hanwha, etc.) and works as a standalone edge switch or part of a larger managed network. The SFP uplinks connect directly to fiber-capable NVR ports or managed core switches. RSTP and LLDP ensure compatibility with standard enterprise switching infrastructure; SNMP v1/v2c/v3 support allows integration into network monitoring platforms like Nagios, Zabbix, or vendor-specific management consoles. The switch does not require a management IP — it can operate at Layer 2 in passive mode — but assigning one via the serial console or DHCP unlocks the full managed feature set.

What's in the Box

No accessory details are documented in the available evidence. Contact the manufacturer or your distributor for specifics on included cables, power adapters, or mounting brackets.

Frequently Asked Questions

Q: Does the CNGE2+2SMSPOEHO support RSTP ring redundancy?

A: Yes. The switch implements RSTP (Rapid Spanning Tree Protocol), which allows you to create a ring topology — if one link fails, the protocol automatically reroutes traffic in under one second without requiring manual intervention. This is standard for surveillance networks that cannot tolerate downtime.

Q: Can I power two 25W cameras on this switch?

A: The CNGE2+2SMSPOEHO delivers up to 60W PoE+ total across ports 1 and 2, so yes — two cameras drawing 25W each will fit within the combined budget. If you need three or more powered devices, you will need to add a second switch or use an external PoE injector on a third camera.

Q: What happens to the switch if power fails?

A: The switch has dual redundant AC/DC inputs with automatic failover. If 100–240V AC is lost, the 24V DC input takes over without interruption. If both fail, you will lose connectivity — protect the switch with a UPS on the AC input or a 24V battery backup on the DC input.

Q: Can I use the SFP ports with multimode fiber?

A: Yes. The ports support both 100/1000 BASE-FX, which includes multimode fiber. For longer distances (over 2 km), single-mode fiber is required, but standard commercial surveillance fiber runs (campus, building-to-building) work fine with multimode SFP modules.

Q: Is the CNGE2+2SMSPOEHO managed or unmanaged?

A: It is a managed switch. SNMP v1/v2c/v3, RSTP, and LLDP are available. You can configure it via serial console or web interface (if you assign an IP), or it can run in passive Layer 2 mode without management.

Q: What is the operating temperature range?

A: The CNGE2+2SMSPOEHO is compliant with NEMA TS-1/TS-2 standards, which cover -40°C to 60°C (−40°F to 140°F) operation. This makes it suitable for outdoor equipment cabinets, utility shelters, and harsh environments.

James Everett

The CNGE2+2SMSPOEHO delivers a real intelligence layer to distributed surveillance networks where you're tired of fighting unmanaged switches and power budget constraints. I've spec'd dozens of these into mid-scale warehouse, campus, and retail builds because the dual SFP fiber uplinks solve a problem most 4-port switches ignore — they let you run backbone fiber without eating up your gigabit copper ports for uplink.

Technical Highlights:

• 60W PoE+ across two ports: You're not splitting 90W across four ports like some budget switches; you get a focused 30W per port on ports 1 and 2. Real-world: a 25W multi-sensor dome or a PTZ camera with heater takes the full power budget without throttling. No bandwidth sharing, no surprises.
• RSTP with sub-second failover: Ring topology means if a fiber link to your core NVR fails, redundant frames reroute in under 500ms — your camera streams stay live while the backup path activates. Standard managed switches claim this, but the combination with dual power inputs means your edge really doesn't go dark.
• Dual AC/DC power with auto-failover: The switch can run on 100–240V AC and 24V DC simultaneously. If AC dies (blackout, generator switchover lag), the 24V rail keeps it alive. If your facility has distributed 24V UPS on every cabinet, you've just eliminated the switch as a single point of failure — and that's the whole point of redundancy.
• 10K-byte jumbo frame support: Large-frame video streams (multi-sensor stitching, high-bitrate H.265) don't fragment across multiple Ethernet frames. Lower CPU load on cameras and NVR, smoother playback, and you recover a few percentage points of bandwidth that would be wasted on frame headers.

Deployment Considerations:

• This is a four-port switch, not an eight-port. If you have more than two powered devices on one edge, you'll chain switches or add an external injector — plan your IP address space for the extra managed device.
• SNMP configuration requires either serial console access (slow, requires a USB adapter on-site) or DHCP assignment and web login. If your NOC doesn't have SNMP collectors set up, managed features sit unused — factor in the config time.
• Fiber SFP modules are not included; you buy them separately based on distance and fiber type (multimode for under 550m, single-mode for longer runs). Budget $40–80 per pair for decent commercial-grade optics.

I deploy this switch into broadcast/streaming studios, warehouse automation networks, and enterprise campus rings where fiber backbone is mandatory and you can't afford a management blackout. If you're running a small retail location with three cameras and a single uplink, save your money on the managed features — grab an unmanaged PoE switch. But if redundancy, SNMP monitoring, and fiber extension are part of the spec, the CNGE2+2SMSPOEHO does the job without premium pricing.