NXU-2A Operations Manual
3-6
Interoperability Now!
3.3.7
Client/Server Selection
Whether the unit will be a client (a unit which can make and break connections) or a server (a
unit which only accepts connections from a client) will need to be decided. This selection is
made with the CONMODE command. CONMODE 0 configures the unit as a client, while
CONMODE 1 configures the unit as a server. For a client unit, you also need to set the IP
address and port of the corresponding server with the SRVRIP and SRVRPORT commands.
For example, if a client unit is going to be connected to a server NXU-2A at address
192.168.1.10 and port 1221, then the commands must be issued:
SRVRIP 192.168.1.10
SRVRPORT 1221
On the client unit, if you do not want the client unit to connect to a server automatically at
power-up then set the server IP address to 0.0.0.0 by typing SRVRIP 0.0.0.0.
Note: The server port on a client unit corresponds to the VoIP port on the server unit that the
client unit is going to connect to. Also, the client unit’s VoIP port does not need to match the
server unit’s VoIP port (or client unit’s server port) for the two units to communicate. The
server unit will automatically determine where to send audio so the client unit receives it.
3.3.8
COR and VOX Settings
The NXU-2A uses the COR (Carrier Operated Relay) or equivalent signal from your radio to
determine when to send audio data across the network. When the COR input is active, audio is
transferred to the other side of the network. The COR command allows you to select the
polarity of the COR input. If a COR output signal is not available, you may select VOX (Voice
Operated Switching). VOX operation uses the detection of an audio signal from your radio or
other audio device to control the flow of audio from the NXU-2A.
Select the polarity of the COR input by using the COR command.
COR 0
selects active low
COR, while
COR 1
selects active high COR sense.
COR 2
selects VOX mode. In VOX mode,
no connection to the NXU-2A COR input is required, since the audio input level itself is used
to determine when a signal is present
.
COR 3
selects VMR (Voice Modulation Recognition)
mode. In VMR mode the unit must detect speech content before a signal is determined to be
present. In order to conserve network bandwidth, digital audio packets are only sent when COR
is active. If using the NXU-2A in an application where the connected equipment does not
support the COR line, then the COR line must either be tied to its active state (in which case
audio will be sent across the network continuously) or you must select VOX or VMR mode.
In
any case, the COR, VOX, or VMR mode must be set properly since the NXU-2A uses this
setting to determine when to send audio data across the network.
3.3.9
Duplex Setting
The NXU-2A allows full-duplex audio operation. Audio can be received and transmitted at the
same time. In some applications this is required, but in other applications this may not be
desirable. For example, if the system echoes back the transmitted audio to provide sidetone
monitoring the resulting audio will be slightly delayed. Listening to a delayed version of your
own voice can be distracting, and in such cases it would be better to use half-duplex audio. Use
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