The full form of NXDN is Narrowband Digital Exchange. It is defined by two main organizations viz. Icom Incorporated and Kenwood Corporation. It operates in VHF/UHF frequency bands and uses FDMA technology.

Following are the specifications of NXDN.
• Offers clear voice quality with minimal background noise and interference.
• Offers secure communication through its digital encryption capabilities.
• Operates on either a 12.5 kHz channel or a 6.25 kHz channel bandwidth. It allows single carrier on one channel at a time.
• Supports multi-site tracking which enables seamless communication over a wide area by interconnecting multiple base stations.
• Supports data applications such as text messaging, telemetry, status monitoring and GPS location tracking.
• Offers better coverage and extends range compared to analog radio systems.
• Some NXDN systems support roaming capabilities.
• Many NXDN radios support both digital and analog modes which facilitates a smooth transition from analog to digital systems.