Model TC8000

Analog/Intercom Audio Multiplexer/Data 2-28 Channels


  • Up to 24 Analog/Intercom Channels
  • Up to 26 Data Channels Plus 2 Analog Channels
  • Voice Bandwidths from 300Hz to 3.4Khz
  • Low Noise PCM Digitized Voice
  • Push-Button Buzzer for Signaling
  • Single Mode & Multimode
  • Built-In Power Redundancy
  • Optional Optical Redundancy
  • Field Interchangeable Interface Modules
  • LEDs for "Alarm," "Power A," "Power B," "Vcc," "Buzzer," & "Push-Button"
  • Rack Mount or Standalone


The TC8000 multiplexes up to 24 channels of Analog or Intercom Signals over single mode or multimode fiber optic cable. It supports voice bandwidths from 300 Hz to 3.4 KHz. The analog interface is for FSK (frequency shift key) applications. It has a 600 ohm isolation audio transformer and supports voltages from 0 to 3 Vpp. The intercom interface is for 4-wire voice communication. It connects to a handset with mouth-and-ear piece.

The TC8000 digitizes the audio signals and converts them to PCM (pulse code modulation). Since the analog and voice signals are digitized, the voice quality does not degrade over extended distances. Distances to 30 km are typical via 1300nm single mode fiber, to 4 km over 850nm multimode fiber.

The TC8000 is available standalone or rack mount. Standalone versions support up to 8 channels, rack mount support up to 28 channels.

The TC8000 multiplexes up to 26 channels of standard data interfaces, RS-232, RS-422/485, TTL and Dry Contact Closures. Interface modules are interchangeable. Four RJ-11 ports are provided on the rear side to connect with handsets or customer's audio devices. Built-in power redundancy is standard. Optical redundancy is available as an option. Fiber Optical connectors are ST; FC is optional. Electrical connectors are RJ-11. Power is 9 to 12VDC or 115/230VAC with an external power cube.

Technical Specifications
Audio Bandwidth
Analog 300Hz to 3.4 KHz
Intercom 300Hz to 3.4 KHz
Channel Capacity
Standalone / Wallmount 2, 4 or 8 Channels
Rackmount Unit 2, 4, 8, 12, 16, 20, 24 or 28 Channels
Data Interfaces
Async RS-232, RS-422, TTL or Dry Contact Detector or Closure
Data Rate Up to 19.2Kbps
Transmitter ELED
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
Analog Interface
(2 or 4-Wire)
600 Ohm (Isolated Transformer)
Intercom Interface Capacitor Coupled
Connector RJ11 Female
Maximum Analog Input 3Vp-p
Connector RJ11(Female)

* Contact factory for higher requirements
Bit Error Rate 1 in 109 or better
Visual Indicators
System PWR A, PWR B, VccA, VccB, ALARM
Electrical Signal Status Pick Up Handset when Flashing, Push to Talk Remote Station Signaling
Standard 12VDC @ 500mA
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) (Details)
Height (6.64 cm) 2.64"
Width (18.13 cm) 7.14"
Depth (24.89 cm) 9.80"
Weight (907 g) 2.0 lbs.


Typical Application (Application Questions)

The TC8000 is frequently used in audio/intercom environments where it is necessary to transmit multiple intercom quality channels or FSK modem channels from one location to another via fiber optic cable. It is also used in harsh environments where ground loops, EMI/RFI interference and lighting conditions may occur.