NXU-2B Operations Manual
1-7
Interoperability Now!
1.8.2
Configuration
The unit is configured via its web-based GUI. There are no physical potentiometers or switches
related to the analog interface configuration. See the NXU-2B manual for instructions on
configuration and adjustment.
1.8.3
Basic Applications and Operation
In many applications, the NXU-2Bs operate in pairs – one unit is configured as a server while
the other unit is configured as a client. The client unit is programmed to connect to the IP address
of the server unit. When the network connection between the units is established, a transparent
connection is created between the audio inputs and outputs of each device, as well as the
complements of each control signal. When the COR signal is active on one device, audio received
on that device is transported over the network and reproduced at the audio output of the second
device, and its PTT output is activated. Additionally, any RS-232 data received on one device is
also sent over the network and is transmitted from the RS-232 port of the second device. This is
the essence of the “Network Extension Unit” name – the devices act similarly to a long cable, if
you think of the associated IP network as that cable.
The NXU-2B is useful for remote radio linking (see Figure 3 below), allowing a LAN, WAN, or
the Internet to be used in place of expensive leased lines.
The NXU-2B is also compatible with the extensive JPS ACU family of radio interoperability
gateways; all have the capability for RoIP channels/interfaces.
Figure 1-2 Two NXU-2Bs Enabling a Radio Repeater Function
A simple application of the NXU-2B. A pair of the devices are used to connect a pair of radio
channels. Note that an Active COR (unsquelched) condition on one of the radios causes its RX
audio to be sent via its associated NXU-2B across the network to the other NXU-2B/radio pair.
The NXU-2B on the other side of the network transforms the RX audio into TX audio, and the
Active COR into Active PTT.
An RS-232 serial data stream can also be sent across the network.
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