dPMR™ Product Class Interoperability

To assist users in the selection of appropriate dPMR products and solutions for specific applications, the dPMR Association have introduced Product Classes to distinguish between the compatibility and capabilities of different dPMR compliant equipment. This interoperability classification is principally required for TS 102 490 compliant equipment (e.g. for dPMR446), where different compliant Vocoders are permitted but will not inter-work with each other.

For equipment operating to ERM dPMR standards as specified in ETSI TS 102 658 in FDMA protocol with a channel spacing of 6.25 kHz (6.25 kHz FDMA standard set), the dPMR Association have standardised the AMBE+2 Vocoder, so users can be sure that any equipment which has passed interoperability (IOP) testing and granted an IOP Certificate or Test Report has the right to display the dPMR logo and will be interoperable with other equipment of the same Class.

In the cases of Class A (AMBE +2 Vocoder) and Class R (RAWCWI Vocoder), equipment of the same Class will offer full interoperability irrespective of manufacturer, while combining the use of equipment from different classes could result in limited functions being available.

Class M equipment employ a manufacturer specific Vocoder and therefore Class M marking of a product serves as a warning to users that it may not work with any other class and, in addition, may not work with Class M equipment from another manufacturer. Product classification marking of TS102 490 unlicensed dPMR 446 compliant equipment:

Classification	Vocoder Type	Interoperability	Product Marking
CLASS R	RALCWI™ Vocoder	Full interoperability with other Class R equipment. Limited interoperability with other dPMR Classes.
CLASS A	AMBE+2™ Vocoder	Full interoperability with other Class A equipment. Limited interoperability with other dPMR Classes.
CLASS M	Manufacturer Specific Vocoder	May not work with other Class M equipment. May not work with other dPMR Classes.