S.I. Tech, Inc.Model 3181 - Highly Shielded USB2.0 Fiber Optic Media Converter

Operation Mode:

USB 2.0

Input/Output Interface:

USB Type B

Transmission Line Interface:

ST optical connector is standard

Transmission Distance:

See distance chart

Transmitter Output Power:

MMF -9dBm Minimum
SMF -9dBm Minimum

System Wavelength:

850 or 1300 nm

Data Rate:

1.5, (USB 1.0) 12,(USB 1.1) and 480 (USB 2.0) Mbps

Bit Error Rate:


Receiver Sensitivity:

MMF(850nm) -17 dBm minimum
MMF(1300nm) -20 dBm minimum
SMF(1300nm) -20 dBm minimum

Operating Temperature:

0°C to 70°C

Metal Enclosure:

9.37X4.25X1.75 (23.8X10.8X4.4 cm)

Input Power:

External with power supply - 5W typical (S.I.Tech #2166 - L 5VDC, UL, CE, & TUVGS Listed)


2 lbs


  • Supports USB 2.0 over fiber
  • ST optical connectors
  • Improved Operation for Vista Operating System
  • Connects to UHCI, OHCI and EHCI Host
  • Supports USB 1.1 and 2.0 Host Controller
  • Works with National Instrument Controllers
  • Highly Shielded Case - Improved EMI/RFI Protection

S.I.Tech 3181 and 3182 are highly shielded 2181 and 2182 USB media converter pair which extends the range of USB 2.0 beyond the USB 5 meter limit. The USB media converters are compliant with the USB 2.0 specification supporting low speed (1.5Mbps), full speed(12 Mbps), and high speed(480 Mbps) USB data transfer.

The 3181 and 3182 provide improved EMI/RFI protection compared to 2181 and 2182. The 3181/3182 are enumerated as generic USB hub and provide a 1-port USB hub at distances up to 2 Km over fiber optic cable. The 3181 connects to host PC through USB type B connector. The 3182 connects to USB peripherals through USB type A connector. The 3181/3182 can be used with 2181/2182.

Meets FCC requirements of Class A, Part 15 Computing Devices Standard.
Specifications subject to change without notice.

View Complete Technical Data Sheet (PDF)


Contact Information: Phone: 630.761.3640 Fax: 630.761.3644 Email: sales@sitech-bitdriver.com
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