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Two Systems with same WACN and System ID

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SCPD

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Here in Nebraska (City: Omaha), we have two systems. One system is the local system for me call ORION (Omaha Regional Interoperability Network (ORION) Trunking System, Omaha, Multi-State - Scanner Frequencies) and the other system is a state-wide system called NWIN (Nebraska Wireless Interoperable Network (N-WIN) Trunking System, Statewide, Nebraska - Scanner Frequencies). Both systems share the same WACN and System ID.

I made a program to track the ORION system full time but I might expand some day to include another scanner to monitor the NWIN system's control messages. All messages that I want to save (E.G: Channel Grants) go into a database and are currently identified by WACN and system ID. How can I automatically tell a part the two systems? Is there any information that will be unique per system?
 

SCPD

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I'm monitoring the system based on control trunking data (which makes me think I'm in the wrong forum). One way would be to id the system based on talkgroup ids or frequencies but I was hoping there was a more full proof way (ID number) as that means I would be required to keep a list of my own unique ids and their control channel frequencies which even if I only keep track of one frequency (the control channel) it could change.
 

radioman2001

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More than likely that's how the controller is doing it, certain talkgroups use channels in group "A" and others use group "B". Are both systems the same frequency band ie: 800mhz? I know here in NYC they have a 480 mhz and a 800 mhz Type II Motorola system that uses talkgroups to simulcast on both systems at once or on the individual systems.
 

SCPD

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They are separate systems all together but the local system is 800mhz and the state wide is 173.xxxx
 

SCPD

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Similar to NYC, but you are using one WACN and SYS ID, possibly even just one master controller. If so the only way I can think of is to monitor both CC's and run 2 separate logging sessions and log the ID's on each.
I assume by ID's you mean talkgroup ID's?

P.S: Thanks for your replies!
 

SCPD

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I never thought about that one. Is there anything in the control channel messages that would state the NAC?
 

SCPD

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I never thought about that one. Is there anything in the control channel messages that would state the NAC?
The 12 bit NAC and 4 bit DUID are the first 16 bits of every P25 packet. On the control channel, each packet may be 1 or more TSBKs. There is no NAC inside the TSBK. The CC data from some scanners will provide the NAC. Others (like the PSR 500), provide only the TSBKs.

You could screen scrape the NAC perhaps.
 

SCPD

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Thanks everyone. This thread has given me something to look into for uniquely identifying systems.

Unitrunker,

Thanks for the last NAC idea. I'm using a PSR 500 to collect data so I will have to look into requesting the current screen from the scanner through the remote control protocol (your screen scrape gave me the idea for that). I'll have to learn that protocol as last time I tried working with it I failed. As far as other scanners go, if I decide to turn my project into something more public I'll work that part out.
 
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