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MPT-1327 GPS

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DSheirer

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By looks of it,
Unitrunker source label say 0-8180 even when Data is just ticked, So therefore GPS must be Ident 8180
Are you asking about GPS messages being transmitted on the control channel as short data messages (SDM)?

The idents should be the FROM/SOURCE ident (mobile transmitting the gps position) and the TO/DESTINATION ident (gps gateway receiving the message).

Can you post any of the decoded log output snippets?
 

francisuk29

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Hi,
I am asking about GPS messages being transmitted on the control channel as i know the company uses GPS to track there Taxis.

The program looks like this;

Source ID 0-8181 Target 0-7902
Source ID 0-8181 Target 0-7909
Source ID 0-8181 Target 0-7904
Source ID 0-8181 Target 0-7906
etc

raw log output

Target ID 0-8181

2014-06-11 13:07:58 7 of 18 (39%)

3D894BE5AAAA System 3D89
80FFFC028000 ALH(0) 0-1FFF/0 C4 A Wait 0
3D894BE5AAAA System 3D89
80C88C879EDE SAMO
80FFFC028000 ALH(0) 0-1FFF/0 C4 A Wait 0
3D894BE5AAAA System 3D89
80FFFC028000 ALH(0) 0-1FFF/0 C4 A Wait 0
3D894BE5AAAA System 3D89
80FFFC028000 ALH(0) 0-1FFF/0 C4 A Wait 0
3D894BE5AAAA System 3D89
80FFFC028000 ALH(0) 0-1FFF/0 C4 A Wait 0
3D894BE5AAAA System 3D89
80FFFC028000 ALH(0) 0-1FFF/0 C4 A Wait 0

Source ID

2014-06-11 13:08:33 7 of 18 (39%)

80F6F3BBFFD4 GTC Data Chan 377 S 0-1FF5 T 0-1EDE
80FFFC028000 ALH(0) 0-1FFF/0 C4 A Wait 0
80FFFC028000 ALH(0) 0-1FFF/0 C4 A Wait 0
3D894BE5AAAA System 3D89
80F6EB537FD4 GTC Data Chan 2A6 S 0-1FF5 T 0-1EDD
3D894BE5AAAA System 3D89
80FFFC028000 ALH(0) 0-1FFF/0 C4 A Wait 0
80F72393FFD4 GTC Data Chan 327 S 0-1FF5 T 0-1EE4
3D894BE5AAAA System 3D89

2014-06-11 13:08:34 9 of 18 (50%)

3D894BE5AAAA System 3D89
3D894BE5AAAA System 3D89
80FFFC028000 ALH(0) 0-1FFF/0 C4 A Wait 0
80FFCC224D20 ACK S 0-1269 T 0-1FF9
 

DSheirer

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If they are transmitting SDMs, you should be seeing an AHYC ahoy message from the trunking controller granting the mobile permission to transmit the SDM GPS message, followed by the controller echoing the received SDM to the intended recipient.

You can read about the SDM messaging sequence on page 14-1 here:

http://www.ofcom.org.uk/static/archive/ra/publication/mpt/mpt_pdf/mpt1327.pdf

Denny
 
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