NXU-2B Operations Manual
4-2
4.4.1
Operation at Power-Up
When the units have been connected and configured and are attached to the network the client
will automatically connect to the server when power is applied.
Note: If no default server has been specified for the client to contact (using the
SRVRIP command; see Section 3.4.8, Client/Server Selection), the client unit will wait
until a manual connection is requested, either via serial or telnet commands or via
the web interface. If the client is able to connect to the server, the LINK ACTIVE
indicator will light indicating the connection.
4.4.2
Input/Output Audio Level Adjustments
At this point, the audio input level to the NXU-2B may be set by adjusting the “RX input level”
in the web browser Configuration page. With normal audio input applied at the Audio/Control
connector, adjust the RX input level browser setting until the AUDIO INPUT indicator flashes
on voice peaks. The “TX output level” browser control sets the audio output level from the NXU-
2B and may be adjusted to the level suitable for the equipment connected to the unit. Don’t forget
to save your changes when you are content with the audio levels.
Selecting a value for RX input level means that the NXU-2B expects that level as its nominal
input. That is, if the NXU-2B RX Audio Input is set to 0, the unit expects, and operates best, with
an input of 0dBm. Likewise, selecting a value for the TX output level means that the NXU-2B will
produce that level as its nominal output level, assuming that the remote NXU-2B (or other linked
RoIP device) has its audio input configured correctly.
4.4.3
COR Input Description
The COR input on Audio/Control controls the flow of data across the network. When COR is not
active the units will send a keep-alive packet every 4 seconds just to keep the connection from
timing out. If a unit has an active COR input, that unit’s audio input will be transferred across
the network and will appear at the audio output on the Audio/Control connector at the other unit.
While the COR input of an NXU-2B is active, the PTT output will remain active on another
NXU-2B it’s connected to. The audio channels are independent, and full duplex operation is
possible. If the radio or other audio equipment does not have a COR output, it’s possible to tie
the NXU-2B COR input line to the active state so that data will be transmitted continuously.
Alternatively, VOX or VMR mode may be selected.
4.4.4
RS-232 Serial Data
RS-232 data is sent across the network connection to the RS-232 connector on the unit at the
other end of the link. Any data input to the RX DATA line on one end will appear at the TX
DATA line on the other end. The serial port data may be sent even while audio is being
transmitted as the two functions are independent. Audio and RS-232 data are multiplexed over
the same IP connection.
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