Comnet ENCODED DUAL VIDEO RECEIVER - FVR20C2M2

Comnet FVR20C2M2 Dual Digital Video Receiver

Overview

The Comnet FVR20C2M2 is a dual digital video receiver designed for remote video and contact-closure signal recovery over fiber-optic cable. This unit receives dual video streams plus dual simplex contact signals transmitted across a 2-fiber multimode link, making it the receive-end counterpart to a matching transmitter in long-distance surveillance or industrial monitoring networks. The 10-bit decoding depth ensures accurate color reproduction and subtle tonal gradation throughout the video signal chain — critical when downstream analytics or forensic review depends on precise pixel-level fidelity.

Key Features

• Dual Digital Video Receiver: Accepts two independent video streams over fiber, allowing you to consolidate multiple camera or source feeds down a single fiber pair. Reduces the fiber count required in existing conduit runs compared to single-video-per-fiber architectures.
• 2-Fiber Multimode Architecture: Operates on standard multimode fiber (typically 50/125 or 62.5/125 micron), which is abundant in existing campus and industrial installations. Multimode extends distances beyond copper (PoE) limits while avoiding the cost of single-mode spool-ups and specialized termination on shorter runs under 3 km.
• 10-Bit Color Depth: Decodes video at 10-bit precision instead of 8-bit, preserving 1024 tonal levels per color channel rather than 256. This prevents posterization in gradual lighting transitions and maintains subtle detail in shadow regions — especially valuable in low-contrast forensic scenarios or when integrating with high-bit-depth recorders.
• Dual Simplex Contact Closure: Two independent contact inputs allow alarm, sensor, or relay signals (door contact, PTZ preset trigger, motion detector closure) to traverse the same fiber link alongside video. Eliminates the need for separate twisted-pair alarm runs in long-distance deployments.
• Industrial Fiber Optics for Surveillance: Fiber-based transmission is immune to electrical noise, ground loops, and surge transients that plague copper-based solutions in electrically noisy plants, utility substations, or rail corridors. If your video links cross railroad tracks, power distribution yards, or industrial machinery zones, fiber avoids the noise rejection headaches of long copper runs.
• Matched Transmit/Receive Pair Design: The FVR20C2M2 is the receive end of a transmitter–receiver set. Pairing it with a corresponding Comnet transmitter ensures synchronized compression, bit depth, and contact-closure timing — critical for systems where timing skew between video and control signals can trigger false alerts or missed events.

Integration & Compatibility

The FVR20C2M2 works as part of a fiber-extended video surveillance architecture, typically paired with a matching Comnet transmitter at the camera or encoder end. The dual video outputs connect to separate camera inputs on an NVR, DVR, or video management system, and the dual contact closures integrate with relay inputs on access control panels, alarm receivers, or PTZ controllers. Fiber distance capabilities depend on your transmitter model and the specific wavelength/frequency architecture — consult the installation manual for link-budget calculations. The unit supports standard industrial fiber-optic patch cords with LC, SC, or ST connectors depending on your transmitter specification.

Deployment Context

This receiver excels in large campus surveillance grids, utility and power-generation facilities, transportation corridors, and manufacturing environments where long video runs (beyond typical PoE range) and electrical isolation are non-negotiable. A common scenario: campus perimeter cameras 2+ km from the main security center, routed through underground conduit alongside power and control fiber. Another: rail yards or substations where EMI from heavy switching equipment would corrupt analog or poorly shielded copper video links. In these settings, the FVR20C2M2 recovers pristine video and sensor signals at the far end of a single multimode fiber pair.

What's in the Box

Documentation and specification files are available from Comnet, including application notes, installation manuals, CAD drawings, and architectural specification templates. For exact contents of the unit itself, consult the installation manual or request a product datasheet from the manufacturer.

Frequently Asked Questions

Q: What transmitter models pair with the FVR20C2M2?

A: The FVR20C2M2 is part of Comnet's fiber transmitter–receiver family. Check the application note and product compatibility documentation for the corresponding dual-video transmitter (typically designated FVT-series) that matches this receiver's specifications.

Q: Can I use the FVR20C2M2 with single-mode fiber?

A: No. The FVR20C2M2 is designed for multimode fiber only. Single-mode fiber requires a different transceiver module and transmitter pair.

Q: How far can I run video over the multimode fiber link?

A: Distance depends on your transmitter model, wavelength, and fiber quality. Multimode typically supports runs up to 2–3 km. Consult the application note for detailed link-budget information and your specific transmitter's range specification.

Q: What is the purpose of the dual simplex contact closures?

A: The two contact inputs allow sensor, alarm, or control signals (e.g., door contact, tamper signal, or PTZ trigger) to be transmitted alongside video over the same fiber pair, eliminating separate copper alarm cable runs on long-distance links.

Q: Is the FVR20C2M2 NDAA-compliant or ITAR-restricted?

A: Comnet products vary in compliance status. Check directly with the manufacturer or consult your distributor for NDAA Section 889 compliance and any export control certifications for this specific model.

Q: Does the FVR20C2M2 require external power?

A: Yes. Fiber receivers require DC power to operate the laser/transceiver and output stages. Consult the datasheet for power supply specifications and voltage/current requirements.

Marty Allison

The FVR20C2M2 is a workhorse for surveillance networks that demand long-distance, noise-immune video recovery. If you're running cameras more than 500 meters from your security center — especially through electrically noisy zones like substations or manufacturing floors — this dual-video receiver with 10-bit color fidelity will save you from the noise rejection and signal-loss headaches that plague copper PoE runs at distance.

Technical Highlights:

• 10-Bit Decoding: Preserves 1024 tonal levels per color channel instead of 256, preventing posterization and shadow detail loss in forensic-grade recordings. Makes a real difference when you're reviewing low-contrast scenes or integrating with high-bit-depth storage systems.
• Multimode Fiber Architecture: Operates on 2-fiber multimode (50/125 or 62.5/125 micron), which is cost-effective for campus runs under 3 km and uses existing conduit infrastructure. No need for single-mode procurement and specialized termination unless you're spanning intercity distances.
• Dual Simplex Contact Closure: Two independent contact inputs ride alongside video on the same fiber pair — ideal for door sensors, tamper signals, or PTZ triggers over long links. Eliminates the need to pull separate twisted-pair alarm cable through the same conduit.

Deployment Considerations:

• The FVR20C2M2 is a receive-end unit only; you must pair it with a matching Comnet transmitter at the camera or encoder end. Timing synchronization and compression parameters between transmitter and receiver are locked in the product family — don't mix vendors or assume interoperability.
• Fiber distance is determined by your transmitter model and wavelength. Multimode limits you to roughly 2–3 km depending on signal quality and bit rate. If you're pushing distance, request a link-budget calculation from Comnet's pre-sales team before ordering.

This receiver shines in utility substations, rail yards, large manufacturing campuses, and any deployment where electrical isolation and long-distance video consolidation are mandatory. If your security center is more than half a kilometer away and EMI is a factor, the FVR20C2M2 delivers the noise immunity and dual-stream capacity you need without the cost and complexity of single-mode fiber.