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External Power
• The 2.1mm Power Jack (center tip positive) and the J1-1(+) / J1-2(-)
connectors both accept 12VDC at 1.2 amps or 24VDC at 2.5 amps
(With 12VDC, the IP7-FX can supply up to 8 watts to the speaker.
With 24VDC, the IP7-FX can supply up to 25 watts to the speaker)
• DO NOT supply power to both the 2.1mm Power Jack and the J1-1
and J1-2 connectors
USB Power
The USB connector can be used to power up the unit for diagnostics or low-
level firmware flashing. Plug a USB cable from a PC into the USB-B
connector. The unit will power up but will not be able to be used for audio
operations.
Audio - Mic and Speaker
Understanding Full Duplex Audio
The IP7-FX Full Duplex Operation is often referred to as Speakerphone or
Hands-Free mode. The technology to enable 2-way conversation without
acoustic feedback involves a process called Acoustics Echo Cancellation
(AEC). For AEC to be effective, the total system design needs to be
considered. This includes incorporating sophisticated DSP electronics and
optimizing the Speaker Frequencies and placement of the speaker and
microphone based on the maximum volume to be played on the speaker.
The Digital Acoustics IP7-FX series has highly advanced DSP electronics with
software that can optimize the endpoint based on the physical environment.
In full duplex echo cancellation mode, when the distance between the
microphone and speaker is small (under 24”), the speaker volume and
microphone sensitivity are limited to help prevent feedback. As the distance
between the two increases, the microphone sensitivity and speaker volume
can increase as there is less chance of feedback.
Understanding Half Duplex Audio
In half duplex audio mode, only the speaker or microphone is active at any
one time. In this mode, the speaker volume and microphone sensitivity can
both be maximized since there will not be any feedback.
Understanding Paging Audio
In paging mode, only the speaker will be active. The speaker volume can be
maximized since there will not be any feedback.
Simple ‘dialog’ choices in the configuration software offer several Audio
Profiles for different environments. Please refer to the Admin Console
Reference Guide for more information on selecting Audio Profiles.
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