Comnet 4-Channel Digitally Encoded Video Transmitter + 4 Audio Channels mm 1 fiber - FVT40A4M

Comnet FVT40A4M 4-Channel Digitally Encoded Video Transmitter

Overview

The Comnet FVT40A4M is a 4-channel digitally encoded video and audio transmitter designed to extend analog broadcast-quality video over single-mode optical fiber at distances up to 6,561 feet without signal degradation. Built for CCTV systems that require long-haul fiber runs — think sprawling campuses, industrial parks, or multi-building complexes where copper cable runs become impractical — this unit encodes four independent video channels and four line-level audio channels into a digital stream and transmits them over a single fiber pair. The 10-bit video encoding ensures true EIA/TIA RS-250C short-haul broadcast quality, while 24-bit audio at 96 kHz sampling preserves fidelity across all four channels. Because the FVT40A4M uses digital transmission, video and audio performance remain completely unaffected by optical path loss up to maximum distance—no analog fade, no noise accumulation, no degradation mid-run.

Key Features

• 10-bit digitally encoded video: Four independent video channels transmitted as digital data rather than analog signal. This means zero degradation across the entire 6,561-foot distance—distance that would render analog fiber transmitters unusable. Your footage at the far end looks identical to the source.
• 24-bit audio at 96 kHz: Four independent simplex audio channels encoded at professional broadcast sampling rate. If you're capturing facility announcements, door intercoms, or alarm tones alongside video, this frequency preserves speech intelligibility and event markers without the compression artifacts of lower sample rates.
• Single multimode or single-mode fiber: The FVT40A4M works with either fiber type, giving you flexibility in existing infrastructure. Single-mode fiber reaches the stated 6,561-foot maximum distance with minimal attenuation; multimode fiber suits shorter runs and is cheaper to terminate. This is a real win for retrofit jobs where you inherit whatever fiber is already in the conduit.
• Plug-and-play transparency: The unit is universally compatible with any NTSC, PAL, or SECAM camera system—no electrical adjustments, no optical tuning, no special configuration. Connect your cameras to the four video inputs, patch audio sources to the four audio inputs, connect the fiber, and the transmitter handles encoding on its own. Installation is literally plug-and-play.
• Rack-mountable form factor: At 5.30" wide × 2.20" tall × 6.10" deep, the FVT40A4M fits standard 19-inch rack infrastructure. No desk space required, no shelf mounting—slides into your equipment rack alongside your control system and NVR.
• Lifetime manufacturer warranty: Comnet backs the FVT40A4M with a lifetime limited warranty, reducing your lifecycle risk on a device intended to run 24/7 in a critical transmission path.

Integration and Compatibility

The FVT40A4M is the transmitter half of the FVT/FVR40A4 series; pair it with a matching FVR40A4M receiver at the far end of your fiber run to complete the 4-channel video and 4-channel audio link. Because the transmitter encodes all channels into a unified digital bitstream over one fiber pair, you need only a single fiber route between transmitter and receiver—no separate cables per channel, no multiple fiber runs. This simplifies conduit planning and reduces splicing points. The unit draws power from a standard 9-volt DC plug-in supply included in the box, tolerating both 50 Hz and 60 Hz mains frequency.

Environmental and Operating Context

The FVT40A4M is environmentally hardened for CCTV use and complies with RoHS (Restriction of Hazardous Substances) and WEEE (Waste Electrical and Electronic Equipment Directive) regulations. The device is manufactured in the United States. Maximum operating distance of 6,561 feet assumes optical fiber transmission—actual usable distance depends on fiber quality, connector cleanliness, and cumulative loss across splices. Plan for regular fiber inspection and cleaning before deploying this unit in a mission-critical surveillance backbone.

What's in the Box

• 1x Comnet FVT40A4M 4-channel video/audio transmitter
• 1x 9-volt DC plug-in power supply

Frequently Asked Questions

Q: Does the FVT40A4M require optical adjustments or alignment after installation?

A: No. The FVT40A4M is a plug-and-play device. Once fiber is connected and power is applied, the transmitter automatically begins encoding and transmitting. No electrical or optical tuning is required.

Q: Can I use multimode fiber instead of single-mode?

A: Yes. The FVT40A4M works with either multimode or single-mode fiber. Single-mode reaches the maximum operating distance of 6,561 feet; multimode fiber is suitable for shorter runs and is generally less expensive to terminate.

Q: What is the warranty coverage on the FVT40A4M?

A: The FVT40A4M includes a lifetime limited manufacturer warranty, covering defects in materials and workmanship.

Q: What fiber connector type does the FVT40A4M use?

A: The evidence provided does not specify the connector type (SC, ST, LC, etc.). Verify the exact connector type with the manufacturer or product documentation before ordering fiber patch cables.

Q: Do I need a separate receiver to complete the link?

A: Yes. The FVT40A4M is a transmitter only. You must pair it with an FVR40A4M receiver at the far end of the fiber run to recover the four video and four audio channels.

Q: What is the power consumption of the FVT40A4M?

A: The evidence does not provide a specific wattage. The unit operates from a 9-volt DC plug-in supply. Contact the manufacturer for exact current draw if power budgeting is critical to your installation.

Ted Perry

The FVT40A4M is a workhorse for anyone running long fiber backbones in sprawling surveillance networks. The 10-bit digital encoding is the key differentiator here—it means you can push four video channels and four audio channels out to 6,561 feet without any of the analog degradation you'd see with traditional fiber video extenders. I've deployed these in campus security systems and industrial parks where fiber runs exceed 2,000 feet. The FVT40A4M handles it without compromise.

Technical Highlights:

• 10-bit video encoding at EIA/TIA RS-250C broadcast quality: Transmits digitally encoded video over fiber, so every foot of the 6,561-foot run delivers identical image quality—no analog noise creep, no signal fade. That distance specification is real and usable, not a theoretical maximum.
• 24-bit audio at 96 kHz sampling: Four independent audio channels encoded at professional broadcast fidelity. Preserves alarm tones, PA announcements, and door intercom audio across the entire fiber span without compression or frequency rolloff.
• Fiber agnostic—multimode or single-mode: Single-mode reaches the full 6,561 feet; multimode is cheaper and works for shorter runs. Flexibility matters on retrofit jobs where you inherit the fiber already in place. No optical adjustments required—plug fiber and power, and the unit begins transmitting.

Deployment Considerations:

• This is transmitter-only; you must pair it with an FVR40A4M receiver to recover the four video and four audio channels at the far end. Plan the complete transmitter/receiver set before ordering.
• The evidence does not specify the fiber connector type (SC, ST, LC, etc.). Verify connector compatibility with your existing fiber infrastructure and patch cables before installation—a mismatch means the system won't connect.

Deploy the FVT40A4M in multi-building campuses, industrial parks, or facilities where the distance from camera cluster to control room exceeds 1,000 feet and fiber is already in the ground. It replaces a half-dozen analog fiber extenders with a single 4-video, 4-audio solution and gives you rock-solid signal integrity all the way to the receiver.