DMR is Digital Mobile Radio so that last part is redundant.
Anyhow I’ve been watching with amusement the whole digital sphere coming to amateur radio. First Icom embraced D-Star or Digital Smart Technologies for Amateur Radio. Nope. Yaesu went with C4FM – this is close to the standard used by public safety’s APCO P25. But doesn’t interact with it. It’s essentially in a silo.
And finally there’s DMR. I chose DMR because there are more DMR radio manufacturers than there are C4FM or D-Star.
Now getting my mind wrapped around how DMR works is interesting. It’s got a lot of features in common with APCO P25 for example. There are talk groups, contacts etc. So it’s a blending of amateur radio and elements of the PSTN or Public Switched Telephone Network.