Model TC2800

Self-Healing Ring Multi-Drop Fiber Optic Multiplexer

TC2800 Multidrop Fiber Optic Multiplexer







  • Sophisticated Tx/Rx Upstream, Downstream Fault Detection
  • Async Data Rates up to 38.4 Kbps
  • Separate Broadcast/Respond Channels
  • Multimode & Single Mode (850/1300/1550nm)
  • Protocol Transparent
  • 4, 8 or 12 Channels RS-232/422/485
  • Anti-Streaming Capability
  • Built-In Power Redundancy
  • Local Dry Contact Alarm Relay
  • Rackmount or Standalone
  • Extend telephone lines with TC1900 RS-232/Fiber Phone Extenders
Model Interface Type Speed Optics Distance
TC2800-21 RS-232/RS485/RS422 Async Up to 38.4 Kbps MM 850nm LED 15 dBm Up to 3.5 Klm
TC2800-23 RS-232/RS485/RS422 Async Up to 38.4 Kbps MM 1300nm LED 15 dBm Up to 6 Klm
TC2800-25 RS-232/RS485/RS422 Async Up to38.4 Kbps SM 1310nm LED 15dBm Up to 30 Klm


Intended for Ring and Self-Healing Ring topologies, the TC2800 Multi-Drop Fiber Optic Multiplexer interconnects up to 12 devices with RS-232, RS-422, or RS-485 (2 or 4 wire) interfaces over single mode or multimode fiber optic cable.  It supports data rates up to 38.4 Kbps.

The TC2800 is designed for a "polled-response" (Slave/Master) type of communication network.  A wide-range temperature version (-20C to 70C), Model TC2800T, is available for extreme environments.

Each unit provides two pairs of fiber interfaces and 4, 8 or 12 independent RS-232 and/or RS-422/485 channels.  Optical signals are re-generated at each drop.  Anti-Streaming is provided to prevent a single node failure (e.g. "babbling") from bringing down the entire network.  Fiber optic connectors are ST or FC.  Electrical connectors are RJ-11 female.  Standard power is 12VDC.  Optional power sources are 24VDC, -48VDC, or 115/230VAC with an external power cube.

The TC2800 is available in three basic configurations: Single Ring with one Master unit, Dual Ring with one Master unit, or Dual Ring with Multiple Master units.  The most reliable configuration is the Multiple Master self-healing ring.  This innovative configuration maximizes the reliability of a single Master because it can recover faults or failures in both rings in several different places.  RS-232 channels can also be used for telephone extensions with Model TC1900 RS-232/Fiber Phone Extenders.

One or two Master units (TC2800) and at least two Slave units (TC2801) are required to form a self-healing ring.  Fault conditions are detected on both Tx and Rx, upstream and downstream, and automatically re-routed to maintain Ring integrity.  Dry Contact alarms can be connected to RTUs/PLCs to help the Control Center pinpoint specifically where a fault has occurred.

*Model TC2800 are Master units, TC2801 are Slave units.

For maximum reliability, the TC2800 is available in a dual Master version (see diagram below), which provides a backup Master Unit.

When a fault condition occurs, the backup Master will start polling the Remote units from the opposite direction.  The primary and secondary Master units can be located anywhere on the fiber ring network. 

The TC2800 offers several features that enhance network flexibility for installation, troubleshooting and expansion including:

  • The ability to add additional channels to the network at any time without affecting the system.
  • The ability to re-configure the network at any time, e.g. moving devices to different rooms.
  • The ability to adapt to different power sources or interfaces.
  • The ability to separate broadcast & receive signals to avoid interference if the self-healing function is activated.
TC2800 Specifications
Channel Capacity
TC2800 4, 8, or 12 Channels
Data Rates
TC2800 DC to 38.4 Kbps (async)
Transmitter LED/ELED/Laser(option)
Receiver PIN
Wavelength 850nm/1300nm multimode
  1300nm singlemode
Fiber Optic connectors ST (FC or SMA optional)
Loss Budget 15dB multimode 850nm/1310nm @62.5um
  15dB single mode
1310nm @9um
Connector RJ11 Female
Type Rs232, RS422, or RS485
Bit error rate 1 in l09 or better
Visual Indicators Tx, RX for each channel, Alarm, Self-Healing
Loop A, Self-Healing Loop B, Power
Power source I2VDC @400ma
24/48 VDC Option
optional: 115 or 230VAC with external power cube
Operating: TC2800
-100C to 550C
-200C to 700C
Storage -400C to 900C
Humidity 95% non-condensing
Micro Size Unit Height (6.5cm) 2.60"
  Width (18.0cm) 7.20"
  Depth (25.0cm) 9.75"
  Weight (1.36kg) 3.0 lb



      Typical Application (Application Questions)