STA-III Plus – Smart Telephone Autocoupler/Hybrid

The STA-III Plus provides a convenient interface between a telephone line and the user’s equipment. Features include auto-answer after a user programmed number of rings, user programmed numeric DTMF access code and relay and audio in/out control via numeric DTMF commands.

Categories: , SKU: d10ec7c16cbe



  • • Auto-answer and auto-disconnect via CPC (calling party control) and/or long dial tone hang up signals, allowing use behind analog PBX switches and POTS lines.
  • • Front panel, plus remote line seize and drop control for manual operation.
  • • Electronic telephone hybrid.
  • • Remote controllable send and receive audio.
  • • Balanced bridging audio input with front panel level control.
  • • Balanced low Z audio output with front panel level control.
  • • Front panel LED’s display power, hook, ring and valid DTMF tone.
  • • Two remote controllable SPDT relays
  • • SPDT End of Call relay.
  • • External SPDT hook relay activates when a valid access code is entered.
  • • Remote line busy input.
  • • User programmable number of rings before auto-answer.
  • • User programmable access code, up to 10 digits.
  • • Loop-thru phone jack.
  • • Plug-in euro-block screw terminals for audio and remote control connections, mating plugs supplied.
  • • Fully RFI proofed.
  • • Surge protected internal power supply, 12 VDC universal switching power supply with domestic connectors supplied. International AC connectors optional.
  • • Each unit may be set on a desktop, mounted on a wall or rack-mounted with the optional RA-1 rack shelf for mounting up to three units in 1-RU.