RELM Wireless Corporation (NYSE MKT: RWC) today announced that it received orders totaling approximately $2.4 million from the U.S. Department of Agriculture, U.S. Forest Service (USFS). The orders are for RELM's D-Series and KNG-Series Digital P-25 mobile and portable radios with accessories. It is anticipated that the orders will be fulfilled during the first quarter.
RELM President and Chief Executive Officer David Storey commented, "As we have for so many years, we are proud to support the wildland firefighting professionals of the U.S. Forest Service.
Project 25 (P25), which requires interoperability among compliant equipment regardless of the manufacturer, was established by the Association of Public-Safety Communications Officials and is approved by the U.S. Department of Homeland Security. The shift toward interoperability gained momentum as a result of significant communications failures in critical emergency situations. RELM was one of the first manufacturers to develop P25-compliant technology.
RELM components will successfully interoperate with the CORP25 system in all normal and abnormal conditions. IOP, which takes place in the Cassidian Communications R&D Centre in Gatineau, Quebec, Canada, is a key step in building multi-vendor ecosystems and best-in-class communications networks.
"RELM Wireless is pleased to achieve this level of interoperability with Cassidian Communications. This extensive testing supplements RELM's P25 Compliance Assessment Program testing and further confirms the reliability and value of our KNG series radios," stated RELM President and CEO David Storey. "Our KNG Series trunking radios are currently providing outstanding value for first responders operating P25 trunking systems from Cassidian Communications and other network providers.
The s hift toward interoperability gained momentum as a result of significant communications - Project 25 (P25), P25-compliant technology is being deployed in several phases, each offering several advantages.
 Phase 1
Phase 1 radio systems operate in 12.5 kHz analog, digital or mixed mode using FDMA access method. Phase 1 radios use Continuous 4 level FM (C4FM) modulation—a special type of 4FSK modulation—for digital transmissions at 4800 baud and 2 bits per symbol, yielding 9600 bits per second total channel throughput. Of this 9600, 4400 is voice data generated by the IMBE codec, 2800 is forward error correction, and 2400 is signalling and other control functions. Receivers designed for the C4FM standard can also demodulate the "Compatible quadrature phase shift keying" (CQPSK) standard, as the parameters of the CQPSK signal were chosen to yield the same signal deviation at symbol time as C4FM while using only 6.25 kHz of bandwidth. Phase 1 uses the IMBE voice codec.
Vendors are currently shipping Phase 1 P25-compliant systems. These systems involve standardized service and facility specifications, ensuring that any manufacturers' compliant subscriber radio has access to the services described in such specifications. Abilities include backward compatibility and interoperability with other systems, across system boundaries, and regardless of system infrastructure. In addition, the P25 suite of standards provides an open interface to the radio frequency (RF) subsystem to facilitate interlinking of different vendors' systems.
 Phase 2
To improve spectrum utilization, Phase 2 has been developed using a 2-slot TDMA scheme. Phase 2 uses the AMBE+2 voice codec to reduce the needed bitrate so that one voice channel will only require 6000 bits per second (including error correction and signalling). Unfortunately, Phase 2 is not backwards compatible with Phase 1 (due to the TDMA vs FDMA operation). This will make analog narrow-band FM the defacto