TLS3 Teltone Telecom Telephone Line Simulator

The TLS3 is a telecom Telephone Line Simulator from Teltone.

Additional Features:

  • Portable 2-line unit
  • Precise call progress tones, tone/rotary dialing
  • Programmable line parameters
  • Caller ID, Visual Message Waiting
  • Realistic, simulated CO/PBX lines in a compact, fully-featured unit
  • Eliminate the cost and hassle of locating phone lines for your demos
  • Ideal for use at industry expos, test labs or production environments


  • Input Voltage: 24 VDC nominal, 500 mA minimum
  • On-Hook Voltage: -42 VDC nominal
  • Inter Interfaces faces: RJ-11
  • Regulatory: FCC Part 15 Class A


  • Ring Frequency: 20 Hz
  • Dial Tone Delay: 0.1 seconds
  • Network Response Delay: 0.2 seconds
  • Line Attenuation: -6 dB, -16 dB; ± 2 dB @ 1 kHz

Call Progress Signals/Test Tones

  • Dial Tone: 350 + 440 Hz continuous
  • Ringback: 440 + 480 Hz follows ringing cadence
  • Busy: 480 + 620 Hz 500 ms on/500 ms off
  • Reorder: 480 + 620 Hz 250 ms on/250 ms off

Forced Disconnect

  • COD signal issued after 2 seconds of valid on-hook condition
  • Signal duration: 850 ms ± 25 ms
  • Line Impedance: 900 ohms

Teltone’s Telephone Line Simulators (TLS) make it easy to test or demonstrate equipment that connects to the North American telephone network (POTS), without requiring a phone company connection. Everything you need is in a compact, portable, AC-powered unit. The Teltone TLS-3 is a two-line version with Caller ID signaling.

Like a miniature central office or PBX, Teltone’s simulators provide accurate dial tone, audible ring, and busy signals to the telephones or other devices connected to them. Many functions of the TLS-3 are easily programmed with a touchtone phone.

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