Guardian Telecom Inc.
Installation and Operation
DTT-50 & DTT-60 Telephones
Page 15
User Operating Mode:
When the handset is off the cradle or the [SPK] key is pressed the phone will go off hook. The LCD
will display the greeting message and the current Audio mode. While the phone is off hook and it
detects a Call Disconnect pulse from the CO line or PABX, the phone will go on hook, even with the
handset off the cradle.
1. Audio Modes:
The DTT telephone has two Audio Modes Handset and Hands-free. The LCD display will show
the current status of the Audio mode. The [
↑
] key and [
↓
] key are volume control keys.
Pressing these two keys will adjust the volume of the current hearing device
a. Handset
mode:
When the phone is on hook or while it is off hook in Hands-free Mode, removing the
handset from the cradle will set the phone to the Handset Mode. In this mode the
speaker and the hands-free microphone are off. The headset receiver and
microphone are off if the headset is configured to replace the speaker. The volume
control keys will adjust the volume on the handset earpiece volume. The phone will go
back to on hook if the handset is returned to the cradle.
b. Hands-free
Mode:
When the phone is on hook, or while it is off hook in Handset Mode pressing the [SPK]
key will set the phone to the Hands-free Mode. After the phone has switched from
Handset Mode to Hands-free Mode returning the handset to the cradle will not put the
phone on hook. The phone will go back to on hook if the [SPK] key is pressed.
Hands-free Mode can be configured to Speaker Phone or Headset by setting the
contents of register #54 to 1 or 2 respectively. Speaker phone capability is standard
however a headset is optional.
i. Speaker Phone Mode:
When the phone is configured to Speaker Phone the hands free MIC and the
speaker are on. The handset MIC and headset are off. The volume control
keys will adjust the speaker volume.
ii. Headset
Mode:
When the phone is configured to Headset Mode, the hands free MIC, speaker,
and the handset are off. The volume control keys will adjust the volume on
headset earpieces.
Note: be sure that Register #54 is set correctly.
2. Dialing Modes:
There are four signaling modes in the DTT telephone.
A. DTMF dialing modes (RS 470 and BTR 21):
In the DTMF mode, using keypad dial, redial, or Phone Book dial will result in having the
phone dialed in DTMF tones.
B.
Pulse dialing (break/make ratio of 60:40) mode
:
In the 60:40 Pulse dialing mode, using keypad to dial, redial, or Phone Book dial will
result in having the phone number dialed in pulse with the break/make of 60:40 at
10pulses/sec. In this mode the Link key (timed break key), the ‘*’ key, and the ‘#’ key
are not supported.
C. Pulse dialing (break/make ratio of 66:33) mode:
In the 66:33 Pulse dialing mode, using keypad to dial, redial, or Phone Book dial will
result in having the phone number dialed in pulse with the break/make of 66:33 at
10pulses/sec. In this mode the Link key (timed break key), the ‘*’ key, and the ‘#’ key
are not supported.
