Digital Sense:

In digital two-way radio systems, there are two main “channel access” methods used today. One is FDMA (Frequency Divided Multiple Access). This method is the oldest and most established in the industry. The other method is TDMA (Time Divided Multiple Access).

The basic difference between FDMA and TDMA is the definition of a channel and how it is used or accessed. In FDMA, a particular bandwidth (e.g., 6.25 kHz) at a particular frequency (e.g., 400.000 MHz) is used to define a channel.

In TDMA, the same principle applies regarding bandwidth and frequency, but the signal is divided into time slots that allow the channel to have ‘extra’ capacity in the same bandwidth, e.g., two 6.25 kHz ‘equivalent’ channels in a 12.5 kHz channel.

True Narrowband: Reliable Communications for Half the Spectrum

IDAS (both NXDN and dPMR) operate at true 6.25 kHz channel efficiency. Even in urban areas, where users often experience channel congestion, narrowband digital channels offer higher communication access capability. Radio spectrum is a scarce resource and IDAS provides a future-proof solution not only now, but also in many years ahead as 12.5 kHz channels become full over time.

Communication Reliability When You Most Need It

There is no need to allow for TDMA time slot synchronization. Instant communications in emergencies and critical situations FDMA is the fail-safe mode of choice in land mobile radio. Nothing else compares.

FDMA: A Proven History Like No Other Radio Technology

For over 50 years, FDMA has been the backbone of two-way radio communication. Generational enhancements have culminated in the realization of 6.25 kHz FDMA digital protocols that are literally ahead of their time while keeping backward compatibility with analogue FM radio.

6.25 kHz Channels: The Current and Future Trend

6.25 kHz channel plans and standards are used in North America, Europe, Japan, Oceania, and the list goes on. 6.25 kHz provides an answer to the worldwide problem of spectrum shortage and efficient use.

6.25 kHz Fundamental Excellence

Narrower bandwidth FDMA provides technical excellence in sensitivity, interference resistance, increased coverage, audio quality, spectrum efficiency and more.

In-building, Campus Communication System

Provides mobile communication in a multi-storied building

Industry Applications for Forestry, Farming and Security (Wide area outdoor use)

Data transfer and worker safety monitoring

Large Scale Multi-site System

Wide area coverage with multi-site system

Come to Fawz Biz; we are the solution provider for NXDN in Bangladesh