What Can "DMR BS DCC:3 RAS" tell me about what I'm (trying) listening to?

[rkillins]

DSD+ Fastlane v2.1.0.9

Listening to a frequency here in SW Ontario, 451.7875. TAFL reveals it's quite a popular frequency. It's illegible. Encrypted or just a weak signal. Don't know.

DSD+ is reporting it as DMR BS DCC:3 RAS
What does this represent, in particular the "BS", "DCC: 3" and "RAS"

3 talkgroups ID'd : 1001, 1003, and 33576

 

[jonwienke]

It.s DMR. DCC:3 means the color code is 3. RAS is Restricted Access System, meaning you can't talk on the system without an authorization key.

 

[rkillins]

Thank you. What is the "BS"?

 

[slicerwizard]

It's a base station (a repeater).

 

[rkillins]

OK. Thank you.

 

[Forts]

Just to clarify a bit... RAS means you can't listen with a 'real' DMR radio, but you should still be able to listen with DSD+ and most DMR scanners (they ignore RAS).

 

[rkillins]

Thanks Forts for the clarification. Just out of curiosity, being new and overwhelmed with trying to digest DSD+ Fastlane, is there a way to tell if the DMR transmission I'm listening to is encrypted? Or unintelligible because of say a weak signal? I was kinda hoping that that information was part of that verbage.

 

[slicerwizard]

Just to clarify a bit... RAS means you can't listen with a 'real' DMR radio, but you should still be able to listen with DSD+ and most DMR scanners (they ignore RAS).

Just to clarify a bit... RAS can't be ignored. Ignoring RAS means decoding no link control data because the checksums all look bad. RAS has to be "handled" and is best done by paying attention to FEC data...

Thanks Forts for the clarification. Just out of curiosity, being new and overwhelmed with trying to digest DSD+ Fastlane, is there a way to tell if the DMR transmission I'm listening to is encrypted? Or unintelligible because of say a weak signal? I was kinda hoping that that information was part of that verbage.

DSD+ reports when traffic is encrypted, unless the signal is too weak to properly decode. So as to your mystery signal being encrypted, it's a definite maybe.

 

[Forts]

Thanks Forts for the clarification. Just out of curiosity, being new and overwhelmed with trying to digest DSD+ Fastlane, is there a way to tell if the DMR transmission I'm listening to is encrypted? Or unintelligible because of say a weak signal? I was kinda hoping that that information was part of that verbage.

When a transmission is active instead of 'Group Call' you should see 'ENC Group Call', and the text will be in italics.

 

[Forts]

Just to clarify a bit... RAS can't be ignored. Ignoring RAS means decoding no link control data because the checksums all look bad. RAS has to be "handled" and is best done by paying attention to FEC data...

Yeah that's what I meant

 

[Forts]

If you look at the attached screenshot (stolen from another thread) you'll see what I'm referring to...

 

[TheButcher]

BP = Basic Privacy
EP = Enhanced Privacy.

(Both basic types of encryption...)


Enc = Encryption
TG = Talkgroup (similar to a channel)
RID = Radio ID (Radio, ID)
Slot = 1 0f 2 timeslots (TDMA)
KeyID = Key alias (key number that is programmed into radio. EP can have up to 15 keys, BP only 1)


BP has 256 keys (255?) and EP has a trillion trillion (that is all I will say on this subject!)

 

[slicerwizard]

BP has 256 keys (255?)

255.

and EP has a trillion trillion (that is all I will say on this subject!)

1.1 trillion.