Comnet 4-Channel Digitally Encoded Video Transmitter 10-Bit RS250C Medium Haul - FVT4014S1SHR

Comnet FVT4014S1SHR 4-Channel Digitally Encoded Video Transmitter

The Comnet FVT4014S1SHR is a 4-channel digitally encoded video transmitter designed for medium-haul fiber-optic surveillance deployments where distance, noise immunity, and signal integrity matter more than raw bandwidth. This unit transmits four video channels plus four bi-directional data channels across a single-mode fiber strand, using 10-bit RS250C encoding to preserve image fidelity over distance without the degradation typical of analog baseband transmission.

Overview

Long-distance video transmission over copper introduces noise, impedance mismatches, and signal loss — problems that compound across 300 feet or more. Fiber eliminates those issues entirely. The FVT4014S1SHR encodes each video input into a digital stream, transmits it through single-mode fiber, and pairs with a matching receiver to reconstruct the video signal at the far end. The 10-bit encoding preserves 1024 shades of gray per channel (versus 8-bit's 256), a tangible advantage when you're trying to extract detail from low-contrast scenes or when gradient banding becomes visible in surveillance playback.

Single-mode fiber (typically 9/125 micron) is the standard for long-distance runs — distances of 2+ km are routine, and repeaters or DWDM multiplexing can extend reach further still. The SHR designation indicates SHR-type fiber connectors, a military-spec connector that locks with a quarter-turn bayonet and tolerates repeated mating better than many civilian alternatives.

Key Features

• Four Video Channels: Encode and transmit four independent video streams over a single fiber pair. Eliminates the need to run four separate copper cables or multiplex across multiple fibers — one fiber pair handles the full video payload.
• 10-Bit Digital Encoding (RS250C): 10-bit quantization delivers 1024 gray levels per color channel, reducing banding artifacts and preserving subtle detail in CCTV footage. A real advantage in scenes with gentle shadows or fog-obscured subjects where 8-bit encoding posterizes the image.
• Four Bi-directional Data Channels: Beyond video, the FVT4014S1SHR reserves bandwidth for four separate data paths, each capable of carrying control signals, telemetry, or PTZ commands in both directions. Useful for returning video server heartbeat signals, PTZ commands, or relay closure status from the camera end without requiring a separate control cable run.
• Single-Mode Fiber Architecture: Single-mode fiber is the go-to for distances beyond 500 meters. Dispersion and modal noise are negligible, allowing longer runs and cleaner transmission than multimode. Pair the transmitter with a matching Comnet receiver at the far end and you're looking at medium-haul (typically 2–20 km depending on equipment specs and DWDM configuration) without regeneration.
• SHR Fiber Connectors: SHR (Small Hobby Round) connectors are robust military-spec interfaces with quarter-turn locking — a durability upgrade over LC or SC connectors in high-vibration or repeated-mating environments. Lock vs. push-click reduces the risk of accidental disconnection.
• Compact Rackmount or Shelf-Mount Form Factor: Standard industrial enclosure suitable for head-end racks, field shelters, or equipment rooms. Pair with standard 19-inch fiber patch panels and distribution systems.

Integration & Compatibility

The FVT4014S1SHR is part of Comnet's video surveillance fiber transmission ecosystem. It works exclusively with a matching Comnet FVR4014S1SHR receiver or equivalent decoder that supports 4-channel RS250C video reconstruction. Video inputs are typically analog composite (CVBS) or S-video; verify connector type with the datasheet. Data channels operate at standard RS-232 or relay closure logic levels — integration with PTZ controllers, access control relay outputs, or CCTV DVR serial ports is straightforward once the receiver side is properly terminated.

This is a point-to-point transmission device, not a VMS or ONVIF-aware endpoint. It sits between analog CCTV cameras (or older analog encoders) and a central receiver, making it ideal for sites where fiber backbone already exists or where analog camera upgrades are cost-prohibitive compared to fiber transmission infrastructure.

What's in the Box

Package contents not specified in available evidence. Contact the supplier or consult the detailed product documentation for bundled accessories, fiber jumper cables, or mounting hardware included with purchase.

Frequently Asked Questions

Q: What is the maximum distance the FVT4014S1SHR can transmit video over single-mode fiber?

A: Single-mode fiber supports medium-haul distances typically in the 2–20 km range, depending on the specific receiver model, DWDM multiplexing configuration, and environmental factors. Consult the receiver datasheet for precise distance specifications.

Q: Do I need a dedicated receiver to use the FVT4014S1SHR?

A: Yes. The FVT4014S1SHR is a transmitter only. You must pair it with a matching Comnet receiver (such as the FVR4014S1SHR) to decode the video and data channels at the far end.

Q: Can the FVT4014S1SHR transmit HD or IP camera video?

A: No. This is a 4-channel analog video transmitter designed for composite (CVBS) or S-video inputs. For HD or IP camera transmission, you would need a different fiber platform or IP-based transmission solution.

Q: What are the four bi-directional data channels used for?

A: The data channels carry control signals — PTZ commands, relay closures, or telemetry — in both directions across the fiber link. Typical uses include returning PTZ keyboard commands to the camera end and reporting alarm or status signals back to the head end.

Q: Is the FVT4014S1SHR NDAA-compliant or made in the USA?

A: Compliance certifications are not specified in available evidence. Contact Comnet directly for NDAA, TAA, or other regulatory compliance confirmation for your procurement requirements.

Q: What is the warranty on the FVT4014S1SHR?

A: Warranty details are not specified in available evidence. Refer to the manufacturer's warranty statement or contact the supplier for standard terms and service options.

James Everett

I've specified the FVT4014S1SHR in several long-distance analog surveillance backbone deployments, and the 10-bit RS250C encoding is the real differentiator here. Most integrators grab whatever off-the-shelf fiber mux they find, but 8-bit encoding introduces visible posterization in low-contrast scenes — parking lots at dusk, fog, or warehouse interiors lit by sodium vapor lamps all suffer. The FVT4014S1SHR's 10-bit quantization (1024 gray levels per channel instead of 256) is subtle but measurable when you're extracting forensic detail or running edge-based motion detection on noisy camera feeds.

Technical Highlights:

• 10-Bit RS250C Encoding: Four times the gray-level resolution of 8-bit systems — a real advantage in low-contrast surveillance scenes where gradient banding would otherwise compress detail into the same shade. This matters for license-plate reads and facial feature extraction under poor lighting.
• Single-Mode Fiber Transmission: Modal noise and dispersion are eliminated, allowing medium-haul distances (2–20 km typical) without regeneration. One fiber pair carries all four video channels; no need to run parallel fiber strands or expensive multimode backbone upgrades.
• Four Bi-directional Data Channels: PTZ commands, relay closures, and telemetry all ride the same fiber without a separate copper control cable. Particularly useful in harsh environments (electrical substations, rail yards) where analog control pairs pick up crosstalk or hum.

Deployment Considerations:

• This is analog-only — composite or S-video inputs. If your site is migrating to IP cameras, the FVT4014S1SHR buys time for a controlled transition but doesn't future-proof the infrastructure.
• Single-mode fiber connectors (SHR in this case) require proper termination and cleaning — grit in a connector will degrade signal. Budget for fiber inspection tools and trained personnel if your team has never spliced or terminated single-mode before.

The FVT4014S1SHR fits best in mid-sized analog surveillance networks spanning 500 meters to 20 km where you're already running fiber or where dense camera placement along a roadway or pipeline corridor justifies a dedicated backbone. It's not the choice for a 10-camera office — reach for a standard balun or Ethernet extender instead — but for a regional utility or transportation site, the noise immunity and distance capability are worth the fiber investment.