DSP Components 437
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Busy: Light up if the telephone remote is in busy status and is not allowed to receive any other
calls.
MCU: Function Reserved.
Fault: Light up if there is an error on telephone line.
Mute: Mute the transmitting audio.
Flash: Allow a 3-way telephone conversation. Press this button during the conversation of the first
remote phone, and dial the number of the second remote telephone. Once the second remote
accepts the call, press [FLASH] button again and start a 3-way telephone conversation.
Level: Adjust the level of transmitting audio.
Delay Key Define: Define the key for delay time. For some telephone systems, it will needs to dial
0 for an outside line before dialing the required number. Between 0 and the outside phone number,
it requires a short delay. In this case, you can define and select the digit signal included '' A,B,C,
D,*,# '' and delay time(sec) for your preference. For example, the digit signal you select is '' # '',
the dial numbers should be "0#XXXXXXXXXX" where X is the outside phone number you want to
call.
Delay Time: Select the delay time for a delay digit.
6.25.2 TC Receive
Receive a telephone call and detects if a DTMF tone output logic signal responded to the key
pressing on remote telephone. It needs to work with the telephone card.
The pins of the component will output the DTMF status.
o 0~9, A~D,* and #: The status of DTMF code.
o A: Indicates as ''Any'' pin; when any of the DTMF code is pressed for dialing, the A pin will be
triggered.
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