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Old 09-10-2013, 2:51 AM
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Default Identifiers on digital conventional/P25?

My county is switching to a digital radio system (non-trunked) and I was wondering how the county would know who is transmitting. Does P25 have identifiers (PTTID) like MDC1200 or is there something else that digital radios do that the console automatically knows what radio transmitted?

The reason I'm asking is because unfortunately the 911 director doesn't have answers and the communications company that got the bid I feel is a little shady and isn't answering all our questions.

Any help is appreciated.
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Old 09-10-2013, 2:59 AM
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Yes. P25 individual unit identifiers. How that would be presented to a console is console dependent (eg alias table), but most subscriber radios I have seen will show the number right on the screen while receiving.
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Old 09-10-2013, 3:14 AM
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Now on a conventional system does the user have to wait for a "go ahead" signal like when an MDC1200 wait tone or is the ID transmitted while the voice is transmitting?
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Old 09-10-2013, 3:25 AM
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It's part of the digital signal overhead, so there is no wait.
I highly suggest this document for a good background on P25.
http://www.danelec.com/pdfs/TG-001-3...ng%20Guide.pdf
Page 31 has info on the unit identifier.
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