General Information

One of the VoIP family products, NXU-2/NXU-2A connects communications equipment to a digital network using VOIP (Voice over Internet Protocol) technology. It is intended for use with radio communications consoles, communications radios, and other products such as ACU Interconnect Unit and SNV-12 Voter.

This unit is a general purpose stand-alone device that interfaces full duplex audio, one RS-232 port, and four status bits onto an Ethernet network. A pair of NXU-2s/NXU-2As can form a simple system that creates a transparent communications link between the two. The unit at the far end is the server, the one at the near end is the client.

Technical Specifications

RX AudioInput

Input Impedance Balanced 47k ohms, transformer coupled
Input Level 0 dBm nominal; 15 dBm connected
FrequencyResponse 10 Hz to 3600 kHz +-2dB

TX AudioOut
Output Impedance Unbalanced 10 ohms, AC coupled
Output Level 0 dBm nominal; +-15dBm 600 ohms load connected
Distortion 0.5% or less (except vocoder)

COR and AUX input
Input Impedance 47k ohm pullup to +5V
Polarity Active Low or high, selectable
Threshold +2.5 V nominal
ProtectionUpto +-100 VDC

PPT and AUX output
Output Type Açık drain, 47 k ohm to +5V
Max.Sink Current 100 mA
Max. Open Circuit Voltage 100 mA

Serial Interface


Rs-232, Assynchronus, FullDuplex
Baud Rates
: 300, 1200, 2400, 4800, 9600, 19,200, 38,400, 57,600, 115,200bps.
DB-9 male, standart PC/AT DCE Pinout

Network Interface
Interface Type
10/100 BASE-T Ethernet, 100 Mbps; RJ-45
Protocols : Audio -UDP, RS232-TCP.
Audio Vocoder GSM compliant (13 kbps)mm G723 ADPCM (16,24,32 Kbps), G.711 (64Kbps) selectable.

Programming RS-232, HTTP (web) veya Telnet
Front Panel : Power, Busy, Link Active, and Channel Active LEDs.
Rear Panel : Audio data, Serial, Network, and Power Connectors.
Audio/DataConenctor DB-15 Dişi
Input Power (12V DC Nominal) : +11 to +15VDC @ 0.5A max. 12VDC wall cute supplied.
Power Connector : Coaxial jack, 2.5mm ID, 5 to 5.5mmOD; center pin positive; reverse polarity protected.
Temprature : Operating; -20 to +60 degrees C. Storage; -40 to +85 degrees C.
Humidity : Upt to 95% @ 55 degrees C.
Shock : MIL-STD-810D, method 516.3, procedure VI
Vibration : MIL-STD-810D, method 514.3, category I


-Radio to IP

-Radio-VoIP applications

-Extending the radio coverage over IP network




 NXU 2A brochure