• Effective immediately we will be deleting, without notice, any negative threads or posts that deal with the use of encryption and streaming of scanner audio.

    We've noticed a huge increase in rants and negative posts that revolve around agencies going to encryption due to the broadcasting of scanner audio on the internet. It's now worn out and continues to be the same recycled rants. These rants hijack the threads and derail the conversation. They no longer have a place anywhere on this forum other than in the designated threads in the Rants forum in the Tavern.

    If you violate these guidelines your post will be deleted without notice and an infraction will be issued. We are not against discussion of this issue. You just need to do it in the right place. For example:
    https://forums.radioreference.com/rants/224104-official-thread-live-audio-feeds-scanners-wait-encryption.html

Trunker Usage_hex Data Field Question

Status
Not open for further replies.

wa3ysu

Member
Premium Subscriber
Joined
Dec 19, 2002
Messages
140
Location
Central Bucks County, PA (Near Phila.)
I have been watching a local Motorola UHF Type II system for a while and have a question about the results I am seeing logged in the Usage_hex field of the Groups file. The system I am watching has several analog and several encrypted talkgroups, and I have also seen emergency calls. In looking at the Usage_hex field of the group file, I find that there are 5 different values that have been recorded for the talkgroups. They are 0, 2, 8, 9, and a.

I reviewed the trunker documentation, and 3 past posts in the trunker mail list on this topic, and I believe that the list below represents the 5 type of conversations that have occurred for these talkgroups:

0 = analog
2 = DES encrypted
8 = encrypted Astro or other digital
9 = (encrypted Astro or other digital)+(emergency)
a = (encrypted Astro or other digital)+(DES encrypted)

Could someone comment if this looks correct and I am interpreting the documentation correctly?


It would appear to me that this list would be all the possibilities for a Motorola system. Does this look correct?

0 = analog
1 = emergency
2 = DES encrypted
3 = (DES encrypted)+(emergency)
4 = Astro or other digital
5 = (Astro or other digital)+(emergency)
6 = (Astro or other digital)+(DES encrypted)
7 = (Astro or other digital)+(emergency)+(DES encrypted)
8 = encrypted Astro or other digital
9 = (encrypted Astro or other digital)+(emergency)
a = (encrypted Astro or other digital)+(DES encrypted)
b = (encrypted Astro or other digital)+(emergency)+(DES encrypted) c = (encrypted Astro or other digital)+(astro or other digital)

Many thanks for the help!

Kel
 

richster

Member
Joined
Dec 19, 2002
Messages
529
Location
Regina, Sask.
wa3ysu said:
I have been watching a local Motorola UHF Type II system for a while and have a question about the results I am seeing logged in the Usage_hex field of the Groups file. The system I am watching has several analog and several encrypted talkgroups, and I have also seen emergency calls. In looking at the Usage_hex field of the group file, I find that there are 5 different values that have been recorded for the talkgroups. They are 0, 2, 8, 9, and a.

I reviewed the trunker documentation, and 3 past posts in the trunker mail list on this topic, and I believe that the list below represents the 5 type of conversations that have occurred for these talkgroups:

0 = analog
2 = DES encrypted
8 = encrypted Astro or other digital
9 = (encrypted Astro or other digital)+(emergency)
a = (encrypted Astro or other digital)+(DES encrypted)

Could someone comment if this looks correct and I am interpreting the documentation correctly?


It would appear to me that this list would be all the possibilities for a Motorola system. Does this look correct?

0 = analog
1 = emergency
2 = DES encrypted
3 = (DES encrypted)+(emergency)
4 = Astro or other digital
5 = (Astro or other digital)+(emergency)
6 = (Astro or other digital)+(DES encrypted)
7 = (Astro or other digital)+(emergency)+(DES encrypted)
8 = encrypted Astro or other digital
9 = (encrypted Astro or other digital)+(emergency)
a = (encrypted Astro or other digital)+(DES encrypted)
b = (encrypted Astro or other digital)+(emergency)+(DES encrypted) c = (encrypted Astro or other digital)+(astro or other digital)

Many thanks for the help!

Kel
Hi Kel,

The correct status bits for a MOT type II system are listed here in the WIKI. This is GOSPEL.

http://wiki.radioreference.com/index.php/Motorola_Type_II

ADDITION:

Also Trunker does not record the status bit a particular TG has used. Trunker will display the status bit at the end of the TG on the screen.

For example if a TG ( oh let's say TG 16 or F in HEX ) on the system is infact digitally encrypted, it will appear on the screen as F8 in hex or 168 in decimal.

The numbers (in hex) you are seeing in the USAGE_hex field is just the POST COUNT, or how many times the TG has had traffic on it.

Regards,
Richster.
 
Last edited:

wa3ysu

Member
Premium Subscriber
Joined
Dec 19, 2002
Messages
140
Location
Central Bucks County, PA (Near Phila.)
Just to clarify, I am not referring 'directly' to the status bits or the 'USAGE_HITS' field. I am referring to the 'USAGE_HEX' field of the groups data file that trunker can save.

Here is the description of the USAGE_HEX field from the Trunker documentation:

UASAGE_HEX:
6 individual bits indicating participation of this entity in a particular type of conversation:
#01 Emergency Call
#02 DES Encrypted Call
#04 Astro or other Digital Call
#08 Encrypted Astro or other Digital Call

I found 2 past dicsussions on the trunker mail list that talk about these values being cumulative, which I beleive would mean a value of 5 in this field would mean that the talkgroup has had both Astro or digital traffic and an emergency call on it.

Am I on the right track?
 

richster

Member
Joined
Dec 19, 2002
Messages
529
Location
Regina, Sask.
wa3ysu said:
Just to clarify, I am not referring 'directly' to the status bits or the 'USAGE_HITS' field. I am referring to the 'USAGE_HEX' field of the groups data file that trunker can save.
Ahh yes sorry I totally misunderstood.

wa3ysu said:
Here is the description of the USAGE_HEX field from the Trunker documentation:

UASAGE_HEX:
6 individual bits indicating participation of this entity in a particular type of conversation:
#01 Emergency Call
#02 DES Encrypted Call
#04 Astro or other Digital Call
#08 Encrypted Astro or other Digital Call

I found 2 past dicsussions on the trunker mail list that talk about these values being cumulative, which I beleive would mean a value of 5 in this field would mean that the talkgroup has had both Astro or digital traffic and an emergency call on it.

Am I on the right track?
You are absolutley correct!!

Regards,
Richster.
 

WayneH

Forums Veteran
Super Moderator
Joined
Dec 16, 2000
Messages
7,464
Location
Sitting in an airport somewhere
The usage field is set on a binary level, and not controlled in hex (hex is used simply for viewing in the TXT file). Whether a certain type of traffic is used or not is signified by either one/yes or zero/no in the appropriate digit's place.

0000 (No modifier which is basically a standard call; ie., analogr)
0001 Emerg
0010 DES
1000 ASTRO

I don't remember what 4 or 0100 signifies.
 
Status
Not open for further replies.
Top