9
Digital Telephone Hybrid
Rio Rancho, NM – USA
BASIC OPERATION
This chapter describes the TH3’s most essential user functions. The word “interface” is used here to distinguish
between the controls associated with the telephone (“telephone interface”) and those associated with the 4-wire
codec (“codec interface”).
Placing a Telephone Call
Telephone calls may be initiated from the TH3’s front panel, from a wired remote control, or from a PC or control
system connected via the TH3’s serial port. The TH3’s DTMF dialer may be used only from a PC or control system.
The simplest way to place a call is to attach a standard telephone to the Telephone Set jack. Dial the call with the
telephone, then press the CONNECT button for the telephone interface. When the TH3 connects, it automatically
disconnects the telephone set from the line. The CONNECT led will turn on and remain illuminated for the duration
of the call.
If the TH3 does not remain connected, please refer to the TROUBLESHOOTING chapter.
For information about using the TH3 software control panel to dial a call, please refer to the chapter on the TH3
SOFTWARE CONTROL PANEL.
Answering a Telephone Call
Upon receipt of an incoming call, the CONNECT led flashes and, optionally, a beeping sound is sent to the audio
outputs to indicate a ringing condition. By default, the TH3 will not answer telephone calls automatically. To manually
answer an incoming telephone call, press the CONNECT button for the telephone interface on either the front panel,
the wired remote control, or the TH3 software control panel. The CONNECT led will turn on and remain illuminated
for the duration of the call.
If the TH3 does not remain connected after answering, please refer to the Troubleshooting chapter.
For information about answering the phone from the TH3 software control panel or configuring the TH3 to answer
incoming calls automatically, please refer to the chapter on the TH3 Software Control Panel.
Ending a Telephone Call
The CONNECT button acts as a toggle. Pressing it while a call is in progress will disconnect the call.
The TH3 offers an automatic disconnect feature which is disabled by default. On telephone networks supporting this
feature, the TH3 can automatically disconnect when the other party disconnects. This feature is not compatible with
some PBX systems and the call waiting feature on some telephone networks. Please refer to the TH3 SOFTWARE
CONTROL PANEL chapter for information on enabling automatic disconnect.
Using the 4-wire Codec
The codec interface works nearly identically to the telephone interface, except that it is simpler. The codec interface
requires no dialing, and no automatic answer or automatic disconnect features are offered.
To connect or disconnect, simply press the codec CONNECT button on either the front panel, the wired remote, or
the TH3 software control panel.
