NXU-2B Operations Manual
3-13
Interoperability Now!
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 will receive it.
3.4.9
Serial Port Settings
The serial port baud rate may be set using the BAUD command. Valid baud rates are 300, 1200,
2400, 4800, 9600, 19200, 38400, 57600, and 115200. The number of data bits may be
programmed to 7 or 8 using the DATA command, while the number of stop bits may be
programmed to 1 or 2 using the STOP command. The serial port parity may be programmed to
odd, even, or none by typing the PARITY command followed by O, E, or N.
3.4.10
COR and VOX Settings
The NXU-2B 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-2B.
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-2B 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-2B 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-2B uses this setting to determine when
to send audio data across the network.
3.4.11
Duplex Setting
The NXU-2B 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
the DUPLEX command to set full- or half-duplex.
DUPLEX 0
selects full-duplex operation (the
default) while
DUPLEX 1
selects half-duplex.
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