RF modules

Home > LMR Protocols > P25

P25 Protocol Stacks

This key North American digital radio standard is enjoying a large and growing market. Designed for public safety but adapted by industry to suit the needs of critical infrastructure, P25 is a highly flexible two-way radio technology suitable for a wide range of applications and geographies. P25 is the standard to see you from analog to LTE.

Implementing robust, secure, P25 equipment is straightforward with Etherstack's complete suite of proven, off-the-shelf P25 technology. Our P25 Mobile and Base Station protocol stacks implement all functionality in the P25 standards to date, including Phase 2, and we are active in TIA standardization.

We also offer a range of supplementary technology including P25 AES/DES cryptographic modules, reference hardware platforms and our all-IP core network suite to help you differentiate your product, keep up with government mandates and exploit the opportunities of narrowbanding, advanced security and LTE.

The P25 Standards

P25 is a narrowband trunking and conventional voice standard that achieves one C4FM voice or control channel within a 12.5kHz bandwidth (Phase 1) or two 6.25kHz equivalent voice channels using two-slot TDMA (Phase 2). Standardisation activities are co-ordinated by the Association of Public Safety Communications Officers (APCO) and the standards themselves published by the Telecommunications Industry Association (TIA).

A formal Compliance Assessment Program (CAP) was inaugurated in 2009 by NIST and the Department of Homeland Security (DHS). Manufacturers currently self-declare conformity in Compliance Assessment Bulletin (CABs) following interoperability testing at an authorized laboratory. CABs are published by DHS/OIC (the Office for Interoperability and Compatibility) and can be found on the Homeland Security Digital Library (http://www.hsdl.org/). Supplier's Declarations of Compliance (SDOC) and Summary Test Reports (STR) are posted to the FEMA Responder Knowledge Base website.

Resources