Polycom Vortex EF2241, Application Note

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T
IPS FOR
V
IEW
S
TATION
FX
1. The volume control for the ViewStation FX controls the incoming far side audio and the local tone
generator. It does not, however, control the sound effects inside the units such as incoming call
ring and the female speech that occurs when you dial a number. This is important to note because
if the volume control is very low, it may appear that the codec audio is operating correctly because
the sound effects are still generated and will be heard in the local room. However, when a call is
connected, the local side may not hear the far side because the local volume control is too low.
Since the local participants heard the sound effects audio at a normal level, it may not be obvious
that the volume control is set too low.
The sound effects volume control can be adjusted in the System Info, Admin Setup, Phone Audio
page.
2. If the ViewStation FX is turned off either through the power switch or unplugged from the wall
while the codec is still connected to the Vortex device via the input and output audio cables, a
loopback will occur in the codec. This means that a portion of the audio signal that is sent to the
codec from the Vortex device will be coupled into the signal that is sent from the codec to the
Vortex device. This will cause the local room to hear a reinforced version of their own speech via
the local room loudspeakers. Our recommendation is to leave the codec power on all the time;
however, if the codec must be powered down, we recommend muting either the output channel of
the Vortex device that will feed the input of the codec or the input channel of the Vortex device that
is connected to the output of the codec.
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