[FedCom] P-25/DG protocol question

[Terry]

NAC Network Access Code
NID Network ID 

Same thing but NAC is generic and I think NID is a Motorola only thing.
Unitrunker has a decode program for these. Presently the scanners don't
care.  We can only hope the next round of radios has the ability to decode
these. Also with the Motorola P-25 repeater it's possible to lock down the
MDC ID.  It compares to trunking where only a valid ID can access the
repeater. Of course the offender could key over a unit and cause
interference but it would stop the kerchunking. If you have a Motorola radio
with proper NAC/NID you can watch the ID's pop up on the display.

 

Terry

-----Original Message-----
From: fedcom-bounces at mailman.qth.net [mailto:fedcom-bounces at mailman.qth.net]
On Behalf Of HornSmoke
Sent: Thursday, June 21, 2007 2:56 PM
To: fedcom
Subject: [FedCom] P-25/DG protocol question

Q: Normal repeaters usually will have a PL/DPL tone, at least on the 
input for obvious reasons. In the P-25 world, is there a practice of 
assigning key and or some such thing that keeps other P-25 radios from 
inadvertently broadcasting, or cross-channeling? For example, on analog 
repeaters the "tone" adds a thin layer of protection from idiots 
"kerchunking." If so, is it like encryption where an actual key or 
algorithm is used?

Loren

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