Page 5 - NEXEDGE-Ability
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NEXEDGE systems use the NXDN digital air interface, a suite
of digital communications protocols using 4-Level FSK (4LFSK) modulation capable of operating in 12.5 kHz and 6.25 kHz bandwidths. NEXEDGE voice security enhances personnel safety, reduces risk and thwarts possible information breaches by protecting sensitive communications.
Spectrum Efficiency and Stability
The NXDN air interface is capable of fitting into both 12.5 kHz and 6.25 kHz bandwidth channel operation to ensure rock-steady frequency stability, exceeding all regulatory and emissions mask requirements in all bands.
The narrower 6.25 kHz bandwidth mode offers a high CNR (carrier-to-noise ratio), so radios can communicate over greater distances.
ESN Radio Validation
Each NEXEDGE subscriber radio has a unique and unchangeable factory embedded Electronic Serial Number (ESN) that can be validated for trunked system access. In the event a radio is lost, stolen or compromised, the ESN can be disabled, enabling all other radios to communicate in their talk groups without disruption.
The operator’s original ID numbering system is preserved because only one subscriber unit is disabled and talk groups shared by many users are unaffected.
Voice & Data Security
    [ NXDN 12.5 & 6.25 kHz ] 12.5 kHz channel
    emission mask
12.5 kHz
FDMA 1 voice path @ CH 12.5 kHz “efficiency”
6.25 kHz
FDMA 1 voice path @ CH 6.25 kHz “efficiency”
6.25kHz 6.25kHz
The NXDN digital air interface offers inherent security against casual electronic eavesdropping, and subscriber units also include the NXDN 15-bit key scrambling function for secure voice & data. IP links are further secured through encrypted VPN tunneling to authenticate and encrypt all inter-site communication. Optional AES &DESencryptionmodulesprovidegovernment/military-grade security against more sophisticated eavesdropping technologies.
If a module is installed
in any other radio unit,
the encryption keys are
automatically erased. In
addition, if more than 15
radio-password attempts
are made, the module’s
encryption keys are also
erased, preserving the
fleet’s current secure
voice integrity.
Radio Password Protection
Each radio can have a required password to authorize operation, thus adding an extra level of security against unsanctioned radio use.
             Improve interference resistance
 Two 6.25 kHz spectrums can be accommodated
[ Secure Voice ]
  Top Secret (TS)
Flexible Channelization
NEXEDGE equipment will program on any channel center or offset (2.5, 3.125, 5, 6.25, 7.5 kHz PLL channel steps), providing more potential to find frequencies. This is important where narrower channel migration is being forced or there is a need
to maximize use of geographical licenses and use split-channels where permitted.
User Validation
All NEXEDGE system configurations validate unit and group IDs for subscriber access. Commercial and private operators can easily activate & deactivate subscriber units via remote programming or system management software. This is ideal for organizations with frequent personnel changes, so radios can be used by contractors, vendors and seasonal/temp workers.
Advanced Encryption Standard (256-bit)
Data Encryption Standard (56-bit)
Scrambler NXDN Digital Scrambler

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