S.I. Tech, Inc.Model 2870 - Coax to Fiber Optic Bit-Driver®
2870 Bit-Driver

Operation Mode: Synchronous, simplex or full
duplex, 2.35 Mbps
Input/Output Interface: 93 ohm coaxial cable BNC
bulkhead jack
Transmission Line Interface: 2 ST fiber optic receptacles (SMA option)
Transmission Distance: See distance chart
Transmitter Output Power: 30 microwatts into 50 micron fiber
System Wavelength: 820 nanometers (1300 nm option)
Receiver Sensitivity: 3 microwatts at 10-9 bit error rate
Operating Temperature: 0 °C to 50 °C
Metal Enclosure: 7.5" x 7" x 3"
(19 x 17.8 x 7.6 cm)
Weight: 3 lbs. (1.36 kg)
Input Power: 110 VAC 50/60 Hz
230V Version: 2870V
Rack Mount Version: 2370 (3000 rack)
The S.I.Tech 2870 Bit-Driver is designed to work with 93 ohm coaxial cable (RG 62/U type) used by IBM in SNA environment. It is a ideally suited to replace coaxial cable between IBM 3274 and 3276 controllers and 3278 terminals. It can also be used between IBM 3299 multiplexer and remote multiplexer. The normal operating data rate is 2.35 Mbps.

This fiber optic Bit-Driver product eliminates many disadvantages of coax, especially EMI/RFI, high attenuation (high signal loss), limiting distance between workstations (2000 feet coax), ground loops (electrical isolation with fiber), weight, and potential lightning damage outdoors between buildings.

S.I.Tech Model 2870 is a stand alone product allowing easy change from coax to fiber: Simply disconnect the BNC connector and plug into the input/output port.


SNA is IBM System Network architecture.

Some fiber types in short distance applications may overload the receiver.

If other than coax cable is used, use balun (impedance matching transformer).

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)


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.
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