NXDN Trunking

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NXDN – Next Generation Digital Narrowband

Part 2 of a 2 Part NXDN Series
NXDN Trunking Types

What you need to know

For details on the basics of NXDN, please see last week’s session, An Introduction to NXDN.

NXDN trunking supports 65,545 group ID’s and User IDs.

Like most trunk systems, NXDN also supports:

  • Single and Multi Site
  • Individual and Group call
  • Automatic Roaming
  • Wide area networking via IP linking.
  • Emergency calls
  • Remote or OTA programming
  • accessory ports for 3rd party apps, such as GPS, MDT.


Like P25, DMR, pDMR, NXDN uses the AMBE+2 Vocoder from Digital Voice Systems, Inc (DVSI).


It was realized that both Control Channel and Distributed logic runking were equally predominant in the US market based on the analog equivalents already in deployment, like EDACS, Motorola Type II, and LTR)


NXDN Type C trunking

C=Dedicated Control Channel – Single or Multiple site trunking using 6.25/12.5kHz FDMA

Like typical TRS where the CC has all the control signal and all communications are done on VC’s


NXDN Type D trunking

No Dedicated control Channel

Single or multi site trunking – 6.25kHz FDMA (no 12.5)

Distributed logic based.  No CC. All channels can operate as the VC.  Think LTR


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Links and Sources from this session:

Scanner School Resources Page

Eric Cottrel’s research on Radio Reference

Kenwood’s NXDN Map

NXDN on Wikipedia

NXDN History on the NXDN Forum

NXDN Overview

NXDN on the Radio Reference Wiki

Understanding IDAS Trunking:

(Some of the above links are affiliate links.  Scanner School may earn a small fee, at no additional cost to you, if you use these links to make a purchase.  This is a great way to help support Scanner School.)

Bonus Material:

Are you looking for your first scanner radio?

Download our new e-guide, “5 Thinks You Need to Know Before Buying Your First Scanner”.   This free PDF is about 30 pages long and has 5 things you should look for, plus a few extra bonus items to make sure you make an educated purchase.

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Podcast Transcription:

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