User`s guide

4: Setup and Conguration • 14
©2014 Axia Audio - Rev.1.3.8
ton. Pressing the button will open the bootstrap window.
The window will permit the setting of the IP address and
restoring of backup congurations.
Station Setup
Axia intercom stations use mDNS in order to avoid
the need for a central controller. With the use of mDNS,
each intercom station is able to learn of other stations
but this requires that each station is congured with a
host name and station label. Each station sends Livewire
audio as part of the audio communication between sta-
tions, so proper setup of the audio is also required prior
to successful operation of the intercoms.
Rackmount and Desktops setup
A factory fresh station will have a default host name
based on the device’s MAC address. The host name is
used as part of the mDNS process to learn of IP address-
ing. Its best practice to change the host name once if
changed at all. This is accessible from the System page.
The main conguration options are located on the
Intercom Conguration page.
Figure 4-2
The Intercom label is used in mDNS and is used by
each station to populate its own discovery table. For this
reason it is important to set a label name and maintain
it. Setting up a system of stations and then changing a
station’s label could create undesired results. Alternate
labels are used to display on station OLEDs by default.
The Intercom talk Livewire channel is the au-
dio that the station generates into the network. When
the station’s audio is to be received by another sta-
tion, the audio channel dened in this eld will be
routed. The numerical value can be in the range of 1
– 32767 and must be a number unique per station. To
enable the channel, select the Live or Standard Stereo.
Note: In Audio over IP (AoIP) there are differ-
ent means of packaging the audio into pack-
ets. Livewire has traditionally provided two
stream types known as Live and Standard. So
what is the difference? Live streams are spe-
cically designed to achieve low delay and in
doing so carries 12 samples (250 microsec-
onds of audio). This provides fairly low net-
work bandwidth efciency. Each packet takes
154 bytes on the wire but carries only 72
bytes of audio. The packet overhead puts the
Live streams at about 47% efciency. Live
stream packets are sent at 4000 packets/s rate.
Each stream requires 4.9MBits/s bandwidth.
Standard streams provide higher network band-
width efciency. Each packet of a Standard
stream carries 240 samples (5 milliseconds of
audio). This provides the highest network band-
width efciency. Each packet takes 1522 bytes
on the wire, which is the maximum allowed
Ethernet frame size. Each packet carries 1440
bytes of audio. The network efciency of Stan-
dard Streams is 95%. Standard stream packets
are sent at 200 packets/s rate. Each stream re-
quires 2.5MBits/s bandwidth.
Listen mix preview/headphone is an optional item al-
lowing for the creation of a network audio stream which
mimics the speaker of the intercom station for the excep-
tion that it does not mute. Volume control of this stream
is by pressing the volume knob inward and rotating the
knob.
Call drop ash is a value in seconds which is used
to dene the duration of time that a station’s channel will
blink to indicate who had just called. For example, if
you received audio where the caller asked if you were
present and the call ended prior to you looking at the
station, the key associated with the caller will blink for