I've been kind of curious about this for years but never put forth the effort to find out for myself.
So I'll ask now.
This question applies primarily to legacy Motorola trunked systems, that is, non-P25 systems.
It concerns the system identification information in the control channel data stream.
What information is actually transmitted as the system ID?
For example, take a given random Smartnet system which has (had) an ID of, say, 123A.
To program that system into a Motorola trunked system you'd need a system key for system 123A.
But wait....there is (was) a feature called "system aliasing" which, as I recall, instructed the radio to only pay attention to the (last, I think) half of the system ID. So the radio would think it's authorized for
systems 123A, 233A, 8D3A, whatever, as long as it ended in 3A.
Or perhaps it was the first two digits instead. I really don't recall with 100 percent certainty.
So what I'm curious about is what system ID information is actually in that control channel.
Since it's most likely that people who can look right at the raw data coming out of the control channel are visiting this subforum, I figured this was the place to ask.
I am also curious, and am asking what is fundamentally the same question, with regard to P25 systems
of both the Motorola and Harris flavors.
Harris did not originally implement system key access control in their radios. I think they do now, at least
as an option. Which makes me wonder how an agency with P25 Motorola radios can get their radios
programmed onto a Harris system that never originally was set up for system key usage.
And, finally, same question again, only this time, with regard to any difference in CC system ID data between systems that use legacy system keys and systems that use the ASK, Advanced System Key.
So I'll ask now.
This question applies primarily to legacy Motorola trunked systems, that is, non-P25 systems.
It concerns the system identification information in the control channel data stream.
What information is actually transmitted as the system ID?
For example, take a given random Smartnet system which has (had) an ID of, say, 123A.
To program that system into a Motorola trunked system you'd need a system key for system 123A.
But wait....there is (was) a feature called "system aliasing" which, as I recall, instructed the radio to only pay attention to the (last, I think) half of the system ID. So the radio would think it's authorized for
systems 123A, 233A, 8D3A, whatever, as long as it ended in 3A.
Or perhaps it was the first two digits instead. I really don't recall with 100 percent certainty.
So what I'm curious about is what system ID information is actually in that control channel.
Since it's most likely that people who can look right at the raw data coming out of the control channel are visiting this subforum, I figured this was the place to ask.
I am also curious, and am asking what is fundamentally the same question, with regard to P25 systems
of both the Motorola and Harris flavors.
Harris did not originally implement system key access control in their radios. I think they do now, at least
as an option. Which makes me wonder how an agency with P25 Motorola radios can get their radios
programmed onto a Harris system that never originally was set up for system key usage.
And, finally, same question again, only this time, with regard to any difference in CC system ID data between systems that use legacy system keys and systems that use the ASK, Advanced System Key.