Model TC1720  
Universal Sync/Async Fiber Optic Modem  

TC1700.jpg (4260 bytes)


  • Data Rates up to 2.5 Mbps
  • Distances Up to 30km* 
  • All Popular Electrical Interfaces
  • Built-In Test Signal Generator
  • Local & Remote Loopback
  • Interchangeable Interface
  • Supports 5 RS-232 Control Signals
  • Multimode & Single Mode Mode (850/1300-1310/1500nm)
  • Built-In Power Redundancy (optional)
  • Recessed Design for Easy Panel Access
  • Local Dry Contact Alarm Relay
  • Rackmount or Stand Alone


The TC1720 is ideal for applications requiring the RS422 interface with the DB37 Connector and high data rates, it supports asynchronous data rates up to 256Kbps and synchronous rates up to 2.5Mbps. 

Distances up to 30km* are possible depending on various factors including electrical interface, optical transmitter, number of fiber optic connectors and fiber type and quality.  Power redundancy is available when the TC1720R is used with the TCRM192 or 196 Rack Assembly and optional in standalone versions. 

Diagnostics are extensive and include a built-in Test Signal Generator, local loopback and LEDs for Power, Alarm, Tx, Rx and all applicable control signals.  The Test Signal Generator verifies both device and fiber optic link operation.

Available for multimode (850/1300nm) or single mode (1310/1550nm), the TC1720 is compatible with all popular sizes and types of fiber optic cable.  Fiber optic connectors are ST, SC or FC.  Electrical connectors are DB37 female.  Power is 12VDC (standard), 24VDC, -48VDC, 125 VDC or 115/230VAC with an external power cube.

The TC1720 is available in two versions: PC Card for installation in a 19' rack assembly , wall mount, or standalone "Pizza" box.  Standalone or rack mount versions can be mixed or matched on either end.  An extreme temperature version (-20 to 70C), Model TC1700T, is also available.

*Contact factory for higher requirements (Laser version).

TC1720 Specifications

Data Rates
RS-422 Sync up to 2.5 Mbps
RS-422 Async up to 256 Kbps
Transmitter LED/ELED/Laser Diode
Receiver PIN
Wavelength 850nm/1300nm multimode
  1310nm/1550 single mode
Fiber Optic connectors ST, SC MM -  ST or SC or FC SM 
Loss Budget TC1720R
15dB multimode 850nm/1310nm @62.5um
15dB single mode 1310nm @9um
(DCE /DTE) RS-422 DB37 female
Bit error rate
RS-422 1 in l09 or better
Visual Indicators
System "POWER A," "POWER B," "ALARM,"
RS-422 "VCC," "Rx," "RxD," "TxD," "RCLK," "TCLK," "CTS," "RTS," "DSR," "DTR," "CD," "LOOP TEST,
Redundant Power source 9 to I4VDC @400mA
optional: 115 or 230VAC with external power cube
optional: 24,-48, 125 VDC  
Operating - TC1720S/R
- 100C to 500C
- 200C to 700C
Storage -400C to 900C
Humidity 95% non-condensing
Stand Alone Unit Height (7.0cm) 2.75"
  Width (18.4cm)7.25"
  Depth (16.5cm) 6.5"
  Weight (700gm) 1.5 lb
Rack Mount Card Height (15cm) 5.963"
  Width ( 1.25"
  Depth (13cm) 6.00"
  Weight (I40gm)6oz


Typical Application (Application Questions)