NXU-2A Operations Manual
4-2
Interoperability Now
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.
If no default server has been specified for the client to contact (using the
SRVRIP command; see Section 3.3.7, 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 that a connection has been
made.
4.4.2
Input/Output Level Adjustments
At this point, the audio input level to the NXU-2A may be set by adjusting the IN LVL control
on the rear panel. With normal audio input applied at J7, adjust the IN LVL control until the
AUDIO INPUT indicator flashes on voice peaks. The OUT LVL control sets the audio output
level from the NXU-2A and may be adjusted to the level suitable for the equipment connected
to the unit.
The proper audio input level may also be set by connecting an AC voltmeter to the test point
TP1 on the real panel and adjusting the IN LVL control for an average audio level of about
0.2V or –12dBm.
4.4.3
COR Input Description
The COR input on J7 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 J7 at the other unit. While the COR input of an NXU-2A
is active, the PTT output will remain active on another NXU-2A 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-2A COR input line to the
active state so that data will be transmitted continuously.
4.4.4
RS-232 Serial Data
RS-232 data at J4 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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