Users may not create topics, posts, or private messages containing or relating to the following material (especially pertaining to Motorola copyrighted software, unless you want Motorola to come along and shut this site down):

  • Listing for sale or trade of, or links to sites offering for sale or trade of, or giving away, Radio
    Service Software (RSS) or Customer Programming Software (CPS)
  • Profanity, pornography, defamation, or slanderous remarks directed towards any individual or entity
  • Commercial advertising (except in the Batboard Vendors forum, as approved by the Admin/Mod Staff)
  • Any other items which may be deemed as offensive

If any topics, posts, or private messages containing or relating to the aforementioned material are brought to the attention of the Admin/Mod Staff, they will be deleted.

Additional FAQ items appear here in Forum Rules. Please review them for posting guidelines and further clarification.

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.

Moderator: Queue Moderator

Bigfella237
Posts: 151
Joined: Wed May 02, 2012 11:30 am

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?

Andrew

Return to “Legacy Batboard Motorola ASTRO (VSELP/IMBE/AMBE) Equipment Forum”

Who is online

Users browsing this forum: No registered users and 1 guest