S.I. Tech, Inc.Model 2811 / 2812 - ON-OFF Fiber Optic Link

Operation Mode: Simplex
Operating Wavelength: 820 nanometers (1300 nm option)
Transmission Distance: See distance chart
Optical Connector: ST or SMA
Power Requirements: See Chart 1
Input/Output: See Chart 2
Optical Power Budget: 10 dB
Operating Temperature: 0 °C to 50 °C
Altitude: Less than 10,000 ft.
Plastic Enclosure: 6" X 6.5" X 2.75"
(15.2 X 16.5 X 7 cm)
Weight: 2lbs. (1 kg)
Mean Time Between Failure: MTBF @ 25 °C = 800,000 hours
MTBF @ 50 °C = 300,000 hours
[Calculated using Belcore method]

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

View Complete Technical Data Sheet (PDF)


The S.I.Tech Model 2811 TR transmits a 10 KHz optical square wave over optic fiber when power is applied and control input shorted. The 2812 receiver detects this optical square wave and turns ON a 4PDT relay. If the fiber cable is removed, broken, or the remote transmitter or local receiver loses power, the relay in the local receiver will turn OFF.

The 4 sets of Form C (4PDT) relay contacts are provided on the rear panel via screw terminal blocks. The power input (+12 VDC or +24VDC) is also via screw terminals.

The fiber optic input/output is provided on the rear panel via ST receptacles, 905/906 compatible SMA receptacles are available as an option.

The front panel contains 2 indicator LEDs, a power ON indicator and a CARRIER (10 KHz detected) indicator.

Chart 1: Maximum Power Requirements

Input 2811 2812

Chart 2: 2811 and 2812 I/O Ratings

2811 Control Input 0 to 500 Ohms
Closure Isolated from
Power or Ground
2812 Contact Ratings
Resistive Loads
Switching Power
Switching Voltage
Switching Current
Carrying Current
60W, 125VA
220VDC, 250VAC

Contact Information: Phone: 630.761.3640 Fax: 630.761.3644 Email: sales@sitech-bitdriver.com
S.I. Tech, Bit-Driver®, and Fiber Cluster® are registered trademarks of S.I. Tech, Inc.
©2015 S.I. Tech, Inc. All copy and images.