S.I. Tech, Inc.Model 2836 - Twinax to Fiber Optic Bit-Driver®- IBM Systems 3/X & AS/400

2836 Twinax Bit-Driver

Operation Mode: Synchronous, half or full duplex 1 Mbps, Serial Bi-phase data
Input/Output Interface: 100 ohm twinax bulkhead jack, IBM Protocol
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)
Operating Temperature: 0 °C to 50 °C
Input Power: 110 VAC, 50/60 Hz, 10 W
Metal Enclosure: 7.5" x 7" x 3"
(19 x 17.8 x 7.6 cm)
Weight: 3 lbs. (1.36 kg)
230V Version: 2836V
Rack Mount Version: Model 2336 - RJ11 connector
(3000 rack)

View Complete Technical Data Sheet (PDF)


The S.I.Tech 2836 Bit-Driver is designed to work with IBM 3/X & AS/400 systems using twinax cable. Model 2836 Bit-Driver is a twinax to fiber optic transmitter/receiver full duplex product implementing IBM Protocol. Normal operating data rate is 1 Mbps.

This fiber optic Bit-Driver product eliminates many disadvantages of twinax, especially EMI/RFI, ground loops (electrical isolation with fiber), high attenuation (high signal loss), limiting distance between nodes of system (5000 feet max. twinax), and potential lightning damage outdoors between buildings.

S.I.Tech Model 2836 is a stand alone product allowing easy change from twinax to fiber. Simply disconnect twinax and connect to model 2836 input/output port. Model 2836 comes with power supply and status indicators.

Optical Unit Connection: Connect the optical transmission line to the T and R receptacles. Note which cable channel goes to T or R by noting the cable imprint. On the other end, reverse the connections.

  1. IBM Specifications: Twinax 5000 ft. (1524 m) max; Local ports -7 devices max; Remote ports - 4 devices max; 5751 Cluster controller; 5251 remote terminal controller; 5294 and 5394 controllers.
  2. If other than twinax cable is used, impedance matching transformers (Balun) are needed.
  3. Some fiber types in short distance application may overload the receiver.

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

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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