Project 25 established the P25 CSSI standard for connecting a console subsystem such as Scout to a trunked radio frequency subsystem (RFSS). Setting up the connection in the Scout console system includes configuring the P25 CSSI driver and Scout Trunking Gateway.

The P25 CSSI driver, which is included in VPGate, connects to the Scout Trunking Gateway. The P25 CSSI driver and Scout Trunking Gateway provide the connection to a P25 Phase 1 or Phase 2 trunked radio system. Phase 1 systems operate at 12.5 kHz using FDMA. Phase 2 systems operate at 6.25 kHz using two-slot TDMA or at 12.5 kHz using FDMA.

The P25 CSSI driver and Scout Trunking Gateway provide a VoIP connection between Scout consoles and the trunked radio system as defined by the TIA-102.BACA standard. The connection from the VPGate to the P25 RFSS uses a standard IP transport requiring no external controllers or vocoders. Scout uses the latest AMBE+2 vocoder with improved forward error correction (FEC) and noise reduction for excellent audio quality.

Basic System Setup

This diagram shows the basic setup between a Scout console subsystem and a P25 trunked radio subsystem. Scout's VPGate software and Trunking Gateway software run with redundancy to ensure connectivity. The P25 Trunked RFSS represents the entire trunked radio system including the trunking radio controller, base radios, and subscriber units.

Multiple RFSS Setup

This diagram shows a Scout console subsystem connecting to a P25 Wide Area Communication Network (WACN) system including two separate radio frequency subsystems, RFSS1 and RFSS2.