While JPS still supports the NXU-2A, it has been replaced by the NXU-2B

The NXU-2A Network Extension Unit uses JPS’ proprietary Radio over Internet Protocol (RoIP) technology to transfer radio digital voice and serial data.

The NXU-2A is a general purpose stand-alone device that interfaces full duplex audio, one RS-232 port and four status bits onto an Ethernet network.

Additional Information:

• • NXU-2A Executive Summary
  • Manual
  • Datasheet

Application Notes:

• RoIP versus VoIP
• Using RoIP Links to Eliminate Voice-Grade Leased Lines
• AT&T EPTT + JPS Interoperability
• Point-to-Multipoint Multicast Communications
• NXU Bandwidth Capabilities
• Auxiliary I/O Control Signals over Ethernet
• Basestation Site Diversity Using the NXU
• NXU to Help Migrate to New Radio System
• RS-232 Control of Devices over Ethernet

It is optimized for use with radios, radio communication consoles, and other JPS products such as the ACU product line.  The Network Extension Unit features a variety of codecs, allowing audio links to be configured for the optimal combination of bandwidth and signal quality.  Provides a low cost, flexible method for extending radio communications over existing network infrastructure; eliminating the need for leased lines and microwave sites.

NXU-2A Simple Drawing:

A pair of NXU-2As can form a simple system that creates a transparent communications link between the two. One of a pair of units is set up as the server, the other as the client. The audio, RS-232, and status bits appear to be simply extended between the server and the client.

Benefits:

• Enables the formulation of low cost, extremely flexible radio communications networks.
• Multiplexes voice audio and data over a standard Ethernet network.
• Allows use of existing network infrastructure, thereby eliminating the need for leased lines and microwave sites.
• Eliminates need for in-band signaling to indicate active PTT condition.
• Facilitates centralized control of a communications network from a single computer.
• The NXU-2A offers adjustable transmit and receive audio delay, VMR COR type, connectionless mode (WAIS), multicast mode, factory reset, and QoS support of DSCP.
• Fully compatible with our with our WAIS,  ACU,  and PCNXU RoIP interfaces.

JPS’s NXU-2A Network Extension Unit offers superior audio quality with a minimal use of network bandwidth.

The NXU-2A Network Extension Unit ability to delay TX and RX audio is ideal for trunking applications where extra delay may be required.  The NXU-2A’s added ability to support multicast Internet protocol (IP) is optimal for customers who use multiple NXUs.  Multicast IP reduces the amount of network traffic, which ensures that each unit in the multicast group will receive communication.

The NXU-2A’s additional hardware offerings include VMR and a “restore to factory defaults” setting.  VMR, as with carrier operated relay (COR) and voice operated transmit (VOX) capabilities, determines when a radio’s squelch function is active. The ability to reset the NXU-2A to a well-defined factory default state overcomes the problem of unknown or forgotten IP addresses.

NXU-2A Use Case: