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Repeater Info, Mobile Info, Portable Info,
Operating Modes, Advantages to using Nexedge Digital Radios
- 136-174, 400-470, 450-520*1 MHz Models
- 5 W RF Output Power
- 512 Channel / Group ID with 128 Zones
- 6 Front & 2 Side PF keys
- 12-Key Keypad Models Available
- Emergency/AUX Key
- 14 Character Alphanumeric Aliases Display
- Backlit Dot Matrix LCD with Backlit Keys
- 3-Digit Sub-Display
- Date & 12/24 Hour Time Clock
- Multi-Language Display
- 500 mW Speaker Audio
- VOX (Voice Operating) Ready
- Dual Priority Scan (Conventional)
- Flash Firmware Upgrading
- MIL-STD-810 C/D/E/F
- MIL-Spec Speaker Mic Options Available
- IP54/55/67*2 Water & Dust Intrusion
- Intrinsically Safe Option*3
NEXEDGE® systems support the following NXDN® digital modes:
- Digital Conventional
- Digital Trunked
- Digital Trunked Wide Area IP Networks
In addition, NEXEDGE® equipment can support legacy analog modes.
Digital Conventional Mode
base units include a 16-RAN(Radio Access Number) capacity conventional
repeater controller for 16 user group site sharing. The 65,519 (each)
Group ID and Unit ID capacity adds group and individual selective
calling capability beyond conventional analog. Also Mixed mode
operation allows analog & NXDN® conventional units to share the same RF channel.
Digital Trunked Mode
NEXEDGE® trunked mode provides increased capacity, enhanced call capabilities,
improved security and faster communications with less required user
operation than conventional systems. The system automatically assigns
channels for faster, efficient use of spectrum, allowing users to
concentrate on the job at hand. The 3,000 (each) Unit ID and Group ID
per-site capacity provides ample unit and fleet organization
capabilities. Group and Individual calls enjoy complete privacy as
other users in the system cannot monitor the calls. The Priority
Monitor feature will monitor for up to 4 high priority talk groups and
switch users to those calls in progress so important calls are not
missed. During peak usage hours, system Call Queuing stacks call
requests and processes calls when a channel becomes available. System
operators can assign important individuals higher queue priority and
even pre-empt lower priority users for more important dispatch and
Digital Trunked Wide Area IP Networks
network option leverages the power of IP to link up to 16 digital
trunked sites together for wide area roaming and calling capabilities.
Scalable networks can be created over existing IT assets, private
microwave, spread-spectrum links or carrier services using standard
10/100 Base-T Ethernet switches and routers. IP Sec VPN tunneling
provides encrypted, secure communications links within any IP network.
Subscriber units use advanced control channel hunting algorithms, RF
signal strength and digital signal quality (low bit-error-rate) to
automatically determine the best sites to register on while moving
throughout a network. The 60,000 Group ID and Unit ID network capacity
is sufficient for large organizations and multi-user system sharing.
The NXDN® Digital Advantage
analog systems as the signal strength decreases in low-coverage areas,
noise and dropouts increase, severely degrading intelligibility.
However, with the NXDN® digital system, which features
enhanced Forward Error Correction (FEC), the digitized audio stream is
less susceptible to noise, resulting in superior clarity at varying
signal strengths. System operators converting from analog to NEXEDGE® typically comment that users now receive calls in areas that were out of range before. NXDN® reduces lost or misinterpreted calls and the need for repeat calls, thus enhancing workforce productivity.
(Click to hear the difference ).
A key element of the NXDN® air interface is the AMBE+2™ vocoder which digitizes speech while
retaining natural voice nuances, performs noise reduction, introduces
FEC and compresses this voice data to accommodate land mobile radio
data rates. Next, the radio's digital signal processor (DSP) protocol-
packages the vocoder, signaling, control, and more FEC data together
and converts this to a uniquely filtered 4-Level FSK digital waveform
that modulates the transmitter. This results in an unusually low
bit-error-rate digital air interface delivering robust communications
even in weak signal strength areas. The NXDN® air
interface is capable of fitting into both narrow 12.5 kHz and very
narrow 6.25 kHz bandwidth channels meeting the tightest of spectrum
efficiency requirements (9600 bps @ 8.3 kHz and 4800 bps @ 4 kHz
occupied bandwidth respectively). NXDN® is a Frequency
Division Multiple Access (FDMA) methodology whereby one user accesses a
channel frequency at any one point in time (i.e. accesses via the
frequency domain). Other digital methods such as Time Division Multiple
Access (TDMA) permit more than one user to access the channel frequency
via time slots (i.e. accesses via the time domain), but there has to be
a tradeoff between coverage and effective transmission rate, as
increasing the former means decreasing the latter.
- AMBE+2™ is a trademark of Digital Voice Systems Inc.
All NEXEDGE® equipment operates in 25 & 12.5 kHz analog and 12.5 & 6.25 kHz NXDN® digital modes – satisfying spectrum requirements today & tomorrow.
Migration by Design
NEXEDGE® extends the life of current radio system assets. All NXDN® digital modes use the same Class-C power amplifiers and site management
equipment used for current analog stations, ensuring return on
investment (ROI) and a multitude of supplier choices. Current analog
and NXDN® digital fleets can share a NEXEDGE® base/repeater station in 12.5 kHz conventional "Mixed Mode," thus
providing uninterrupted service as long as needed and a straightforward
migration path as aging analog fleets are replaced with digital. Also,
NEXEDGE® trunked traffic channels can be shared with
existing external analog conventional or trunked logic controllers,
extending service to fleets as a transition to NXDN® trunking is underway.
Variety of Operation
NEXEDGE® systems are configurable in traditional conventional, trunked and wide
area trunked network operation modes. IP connectivity for NEXEDGE® trunked sites provides scalability over existing LAN/WAN assets and services.
Outstanding Voice Quality
AMBE+2™ Vocoder is a state-of-the-art voice compression
digitization technology that offers superior clarity at varying signal
strengths, even at highway speeds.