NXDN

20130313-iwce2013

NXDN™ is a very narrowband protocol employing 6.25/12.5 KHz FDMA technology.

Technical Specifications of NXDN™

Access Method FDMA
Modulation 4-level FSK
Vocoder AMBE+2™
Channel Spacing 6.25 kHz 12.5 kHz
Transmission Rate 4800 bps 9600bps
Codec Rate 3600bps 7200bps
Conventional Yes
Trunking operation Yes
Type-C and Type-D
Yes
Type-C
Digital Scrambling Yes (15-bit/32,000 keys)
Encryption Yes (AES/DES)

Vocoder

NXDN™ has utilized the AMBE+2™ vocoder from Digital Voice Systems, Inc. (DVSI). This vocoder is recognized as the leading low-bit rate vocoding technology and has also been widely adopted in other two-way radio standards like dPMR™, DMR, P25 Phase 1 and Phase 2. The use of this vocoder in its “half-rate” mode is also a leading factor in achieving 6.25 kHz operation. The vocoding advancements in P25, an accepted digital standard, allowed further enhancements to signal quality.

Useful Links

Real Time Traffic Log

Tampa NXCore Log (Coming Soon)