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P25 X2 Technical Specifications

This forum is dedicated to discussions pertaining specifically to the Motorola ASTRO line of radios (those that use VSELP/IMBE/AMBE), including using digital modulation, digital programming, FlashPort upgrades, etc. If you have general questions please use the General or Programming forums.

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P25 X2 Technical Specifications

Postby Bigfella237 » Sun Sep 28, 2014 5:23 am

I know P25 X2 is Motorola proprietary but does anyone know if there exists any technical specs for it similar to the TIA specs for P25 or ETSI specs for DMR?

Information on this protocol is extremely hard to come by but from what little I've seen P25 X2 appears to be very close in its design to DMR; both use the AMBE vocoder (like P25 Phase II); and both are 9600bps (unlike P25 Phase II which is 12000bps).

The main thing I'm trying to confirm, if anybody happens to know, is whether P25 X2 uses a 64-bit Message Indicator (MI) like P25, or a 32-bit MI like DMR?

If I had to guess, I'd say they stayed with the 64-bit MI as P25 Phase I had at the time, but the lower bitrate means space is tight, maybe this necessitated reducing the size of the MI to 32-bit?


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