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The AXIS 2191 Audio Module
36
Simplex - Talk
Simplex - Talk mode means that only the web-client end of the connection can transmit audio
(that is, to the AXIS 2191). This can be used to e.g. provide spoken instructions to a person
seen in the image from the video server. This mode also requires the Push-to-Talk button.
Simplex - Listen
Simplex - Listen mode can only receive audio from the AXIS 2191 to the web-client. This can
be used in remote monitoring, web attractions etc., to provide live audio, as well as video, of a
monitored situation.
Troubleshooting the Audio Module
Symptoms
No audio controls below
image.
No sound from the AXIS
2191 or from a PC trying to
access a web page
containing audio content.
No audio signal from PC to
the AXIS 2191 when passing
a proxy server.
No full-duplex function.
Poor performance.
Whining or screeching sound
from speakers (feedback).
Poor sound on headphones.
The Power indicator LED is
not constantly lit.
The AXIS 2191 works locally,
but not externally.
Note:
If you still have a problem after reading this information, contact your reseller, or visit
www.axis.com and check the support section for Axis camera and video products.
Possible causes
The AXIS 2191 is not selected
for use on COM2.
Wrong video server firmware. If the AXIS 2191 does not appear as a purpose for COM2 in the
Incorrect settings or faulty
connections.
The Post Content Length set
in the proxy server is too low.
Incorrect configuration.
Sound card does not support
full-duplex.
Too many users/clients.
Low bandwidth.
Poor positioning of speakers
and/or microphone.
Incorrect connection.
Faulty power supply.
Firewall protection.
Default routers required.
AXIS 2400/2401 Admin Manual
Remedial actions
In the server's administration tools, click on the icon for COM2 and
set the purpose to AXIS 2191 Audio Module.
Administration Tools, the server does not have the correct firmware
and must be upgraded. See Updating the Firmware, on page 44.
Check that:
•
sound card, speakers and microphone are connected
•
the Mute button is not pressed
•
the Int/Ext switch for the input is in the correct position
•
the input and output levels are correct
•
all cabling is connected and all power switches are ON
Set the value of the Post Content Length in your proxy server to 1MB
or more. You may need to contact your system administrator to do
this.
Check the setting in the server's administration tools.
For information on how to check if your sound card supports
full-duplex, please visit www.axis.com and see the support section for
Axis camera and video products.
Try limiting the number of clients allowed to connect.
Reduce the available bandwidth by changing to a lower setting in the
Available Bandwidth selector. Setting a lower bandwidth will reduce
any break-up in the sound, but will also increase the transmission
delay.
If running in Full-Duplex mode, try switching to Half-Duplex mode.
Relocate the speakers or microphone so that they do not point
towards each other, and/or lower the volume.
Headphones can only be used by connecting them to Speaker-Out on
the terminal connector.
Verify that you are using an AXIS PS-D power supply.
Check the Internet firewall with your system administrator.
Check if you need to configure the default router settings.
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