Introducing Pseudo Trunk Technology in Hytera Two-Way Radios

️ Understanding “Pseudo Trunk” on the Hytera BP518 / BP568 — A Technology That Optimizes Communication Channels

Introduction

In digital radio communication systems, using frequency efficiently is always a key challenge — especially in high-traffic environments such as factories, hotels, construction sites, or security teams. With the Hytera BP518 / BP568 digital two-way radios, users get clear audio and strong security, plus a smart feature called Pseudo Trunk.

What is Pseudo Trunk?

Pseudo Trunk (PTT) is a smart mechanism on DMR (Digital Mobile Radio) two-way radios that automatically picks an available time slot to transmit voice signals, without needing a repeater station like traditional trunking systems.

The concept, simplified:

Carry 2 simultaneous calls on the same frequency without a repeater, thanks to splitting the frequency into 2 time slots (DMR Tier II TDMA).

⚙️ How Pseudo Trunk works

In DMR Tier II, each channel is divided into 2 time slots:

  • Slot 1 and Slot 2 operate alternately in time (2-slot TDMA).
  • Normally, users are pre-configured to use one specific slot.

With Pseudo Trunk, however, when someone presses PTT to transmit:

  • The two-way radio automatically checks which slot is free.
  • It selects the free slot to transmit on.
  • This significantly reduces channel congestion when many users share the same channel.

Pseudo Trunk on the Hytera BP518 / BP568

The Hytera BP518 and BP568 are compact handheld DMR digital two-way radios that support both analog and digital modes, with Pseudo Trunk integrated even when no repeater is present.

Specific benefits:

Two people can talk simultaneously on the same frequency — each on a different slot. Doubles the efficiency of frequency use. Reduces transmission latency since there is no need to wait for a fixed slot.

No complex setup required — just enable the Pseudo Trunk function in the software.

️ How to activate Pseudo Trunk

  • Connect the two-way radio to a computer using the Hytera programming cable.
  • Open Hytera CPS (Customer Programming Software).
  • Go to Digital Channel > Edit Parameter.
  • Enable the Pseudo Trunk Mode option.
  • Save the configuration and reload it onto the two-way radio.

Note: Both the transmitting and receiving radios must have Pseudo Trunk enabled for it to work correctly.

Real-world applications

In hotels: security teams, housekeeping, and reception can all call at the same time without channel congestion.

On construction sites: two work crews share a single frequency yet can still talk separately, making the most of the equipment.

In event security: monitoring, security, and logistics groups can communicate simultaneously without investing in a repeater.

❓ Comparing Pseudo Trunk with true Trunking

Criterion Pseudo Trunk Trunking (DMR Tier III)
Infrastructure No repeater required Requires a central repeater
Physical channels 1 channel (split into slots) Multiple coordinated channels
Cost Low High
Best fit Small businesses, security teams, hotels Large-scale systems, utilities, transportation

Summary

The Pseudo Trunk feature on the Hytera BP518 / BP568 is an excellent tool for boosting communication efficiency, reducing channel congestion, and getting the most out of your equipment investment. It is the ideal solution for organizations that need a smart communication system but cannot justify deploying full trunking.