Details

Extron FOX3 SR 331 MM (part number 60-1778-21) — a multimode fiber receiver built for mathematically lossless 4K/60 DisplayPort delivery to a KVM workstation.

Paired with a FOX3 T 331 transmitter, this receiver recovers video, USB HID, audio, and control data over multimode glass and outputs scaled DisplayPort at up to 4096x2160 at 60 Hz, 4:4:4 color. Unlike its SR 321 sibling, the SR 331 keeps the USB side dedicated to HID peripherals only — keyboards, mice, and touch controllers — rather than general USB 2.0 devices, which simplifies KVM deployments where a stray USB device shouldn't be extendable. Running lossless mode over a single fiber, it targets workstations where compression is not an option.

Key Capabilities

Lossless 4096x2160 at 60 Hz, 4:4:4 DisplayPort output over one multimode fiber
Multimode reach to 500 m (1640 ft) on OM4 laser-optimized cable
2-port USB HID extension for keyboard, mouse, and touch control
RS-232 and IR insertion for remote source and display control
Analog stereo audio de-embed with a local audio return channel
Front-panel USB configuration port and rear RJ-45 for Ethernet monitoring

Where It Is Used

Built for KVM-style DisplayPort workstation extension in control rooms, trading desks, and secure facilities where only HID peripherals — not general USB storage or cameras — should be able to reach the source.

Specifications at a Glance

Video: DisplayPort 1.2a, up to 4096x2160 at 60 Hz, 4:4:4, 21.6 Gbps
Fiber: multimode, 500 m max reach, 2 or 4 LC connectors, 850 nm
USB: 2-port USB HID only, 100 mA available
Enclosure: half-rack metal, 1.7"H x 8.75"W x 8.5"D, 2.4 lbs
Power: internal 100-240 VAC supply, 26.1 W consumption

Also referenced as Extron FOX3SR331MM, FOX3-SR-331-MM, part number 60177821.

Specifications

Part Number: 60-1778-21

Manufacturer: Extron

Model: FOX3 SR 331 MM

Condition: New

Video Output Signal: 1 single-link DisplayPort, female DisplayPort Type A

Max. Video Data Rate: 21.6 Gbps (5.4 Gbps per lane)

Max. Pixel Clock: 594 MHz

Max. Resolution: 4096x2160 at 60 Hz, 4:4:4 chroma, up to 10-bit color (lossless over 1 fiber)

Scaled Output Resolutions: 480p through 4096x2160, plus 1 custom mode and bypass

Standards: DisplayPort 1.2a

Audio Output: 1 digital (2-CH PCM de-embedded from DisplayPort) or 1 analog stereo, balanced/unbalanced

Audio Output Connectors: 1 DisplayPort (shared with video), 1 3.5 mm captive screw, 5-pole

Frequency Response: 20 Hz to 20 kHz, ±0.5 dB

S/N Ratio: >90 dB at maximum output, unweighted

THD + Noise: <0.1% at 20 Hz to 20 kHz, nominal level

Audio Output Impedance: 50 ohms unbalanced, 100 ohms balanced

Audio Return Input: 1 analog stereo, balanced/unbalanced, 3.5 mm captive screw, 5-pole

Audio Return Input Impedance: ≥10k ohms unbalanced, ≥20k ohms balanced

Audio Return Nominal Level: +4 dBu (1.23 Vrms), -10 dBV (316 mVrms)

Audio Return Maximum Level: +21 dBu balanced, +15 dBu unbalanced

Fiber Connectors: 2 or 4 LC (1 or 2 SFP modules)

Operating Distance (Multimode): 500 m (1640 feet) with 50 µm OM4 laser-optimized multimode cable

Nominal Peak Wavelength: 850 nm (multimode)

Fiber Data Rate: 10.0 Gbps (1 fiber) or 20.0 Gbps (2 fibers)

Transmission Power (Multimode): -3.3 dBm, typical

Receiver Sensitivity (Multimode): -13.0 dBm, typical

Optical Loss Budget (Multimode): +9.7 dB, maximum

USB Configuration Port: 1 front-panel mini USB B, Ethernet over USB, USB 2.0 low speed

USB Host Ports: 2-port USB HID, 2 USB Type A female connectors, 0 built-in hubs

Available USB Power: USB HID ports 100 mA

Serial Host Control: 1 RS-232, 3.5 mm captive screw, 5-pole, 9600 baud, 8 data bits, 1 stop bit, no parity

Serial Pass-Through: 1 RS-232, 3.5 mm captive screw, 5-pole, 9600 to 115,200 baud

IR Control Port: 3.5 mm captive screw, 5-pole (shared with RS-232 pass-through), 30-56 kHz modulated

Ethernet Control: 1 RJ-45, 10/100/1000Base-T, default IP 192.168.254.254

Program Control: Extron Product Configuration Software, Extron SIS

Power Supply: Internal, 100-240 VAC, 50-60 Hz

Power Consumption: 26.1 watts

Thermal Dissipation: 73.3 BTU/hr

Ambient Temperature/Humidity: Storage -40 to +158°F (-40 to +70°C), 10-90% noncondensing; Operating +32 to +122°F (0 to +50°C), 10-90% noncondensing

Cooling: Convection

Enclosure: Metal, 1.7" H x 8.75" W x 8.5" D, half rack wide (depth excludes connectors)

Mounting: Rack mount with optional shelf; furniture mount with optional under-desk kit

Product Weight: 2.4 lbs (1.1 kg)

Regulatory Compliance: CE, c-UL, C-tick, FCC Class A, ICES, UL, VCCI; complies with RoHS and WEEE

Product Warranty: 3 years parts and labor

Everlast Power Supply Warranty: 7 years parts and labor

Diagram

Resources

Brochure | FOX3 SR 331 MM 60-1778-21 | FOX3 DisplayPort Extenders

Brochure | FOX3 SR 331 MM 60-1778-21 | Extender DisplayPort FOX3

Brochure | FOX3 SR 331 MM 60-1778-21 | Extendeurs DisplayPort FOX3

Brochure | FOX3 SR 331 MM 60-1778-21 | Extensores FOX3 DisplayPort

Brochure | FOX3 SR 331 MM 60-1778-21 | FOX3 321 和 331 DisplayPort 光纤延长器

Brochure | FOX3 SR 331 MM 60-1778-21 | FOX3-DisplayPort-Extender

Manual | FOX3 SR 331 MM 60-1778-21 | FOX3 Matrix Series Network Ports, Protocols, and Licenses Guide

Manual | FOX3 SR 331 MM 60-1778-21 | FOX3 SR 321/331/211 Setup Guide

Manual | FOX3 SR 331 MM 60-1778-21 | FOX3 SR 321/331/211 User Guide

Specifications | FOX3 SR 331 MM 60-1778-21 | FOX3 SR 321/331

Panel Drawing | FOX3 SR 331 MM 60-1778-21 | FOX3 SR 331

Payment & Security

Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.

Extron FOX3 SR 331 MM Fiber Optic Scaling Receiver 60-1778-21

Name: Extron FOX3 SR 331 MM Fiber Optic Scaling Receiver 60-1778-21
Brand: Extron
SKU: EXTRON-FOX3SR331MM-60177821
Availability: InStock

Manufacturer: Extron

Type: Fiber Optics

Extron FOX3 SR 331 MM Fiber Optic Scaling Receiver

• Lossless 4K/60 DisplayPort output at 4:4:4 chroma over one fiber
• Multimode fiber reach to 500 m (1640 ft) on OM4 cable
• 2-port USB HID extension for keyboard, mouse, and touch control
• RS-232 and IR insertion keep sources and displays controllable at distance
• Analog stereo audio de-embed with a local return channel
• Half-rack 1U enclosure draws just 26.1 W
• Ethernet monitoring via RJ-45 for remote system management

Need service or repair? No matter the age, brand, or manufacturer Ampronix can repair it! Free, no charge for initial evaluations!

SKU: EXTRON-FOX3SR331MM-60177821