Model TC2900

Bus/String Multi-Drop Fiber Optic Multiplexer




  • Support Bus/String Topology
  • Async Data Rates up to 38.4 Kbps
  • Separate Broadcast/Respond Channels
  • Multimode & Single Mode (850/1300/1550nm)
  • Distances up to 100Km
  • 4, 8 or 12 Channels RS-232/422/485
  • Tx & Rx LED's for Each Channel
  • Anti-Streaming Capability
  • Built-In Power Redundancy
  • Local Dry Contact Alarm Relay
  • Rackmount or Standalone
  • Extend telephone lines with TC1900 RS-232 or Fiber Phone Extenders


Intended for Bus or String topologies, the TC2900 Multi-Drop Fiber Optic Multiplexer links up to 12 monitoring devices (RTU's  or PLC's) fitted with RS-232, RS-422, or RS-485 (2 or 4 wire) interfaces to a Host controller or CPU. It supports asynchronous data rates up to 38.4 Kbps.

The TC2900 works in a "polled-response" (also called Slave/Master) types of communication network. Model TC2900 is the Master, TC2901 is the Slave Units. A wide-range temperature version (-20C to 70C), Model TC2900T, is available for extreme environment applications.

Each TC2900 unit provides two pairs of fiber interfaces and 4, 8 or 12 independent RS-232 and/or RS-422/485 channels.  The RS-232 channels can be used for data or as telephone extension with the Model TC1900 "Quick-Talk" Telephone Extenders.  Diagnostic LED's include Tx and Rx for each channel, Power A, Power B, VccA, VccB, SyncA, SyncB, LP-A and LP-B. An Anti-Streaming capability is provided to prevent a single node failure (e.g. "babbling") from bringing down the entire network.

                       Technical Specifications 
Data Rates
Async RS-232/422/485 Up to 38.4 Kbps
Transmitter ELED, ELED, LASER*
Receiver PIN Diode
Wavelength 850nm, 1300nm Multimode
1300nm, 1550nm Single Mode
Fiber Optic Connectors ST or FC
Loss Budget*
(850nm, 1300nm, 1550nm)
Multimode (62.5/125m): 15dB
Single Mode (9/125m): 15dB
Connector RJ11 Female
Interface RS-232 (DTE or DCE), RS-422, or RS-485 (2 or 4 wire)
Bit Error Rate 1 in 109 or better
Diagnostic Functions
Local & Remote Loopback, Signal Generator, Master/Slave

* Contact factory for higher requirements
Dry Contact Normal OPEN
Visual Indicators
System Status PWR A, PWR B, VccA, VccB
Electrical Signal Status Tx, Rx (for each channel)
Optical Signal Status TxA, RxA, TxB, RxB, SYNC A, SYNC B, LPA, LPB
Standard 12VDC @ 800mA
Optional 24VDC, -48VDC, or 115/230VAC (with external power cube)
Operating -10 to 50C
Hi-Temp (optional) -20 to 70C
Storage -40 to 90C
Humidity 95% non-condensing
Physical (Standalone/Wallmount Unit)
Height 6.71 cm) 2.6" 
Width 18.10 cm) 7.1"
Depth 24.89 cm) 9.8"
Weight (1.82 kg) 4 lbs.



 Typical Application (Application Questions)