Recently found out that beginning with Oakland County MPSCS will be beginning migration to TDMA format. Anyone have any information on what scanners will be able to monitor the TDMA format? JB
800MPSCS to TDMA
- Thread starter JBE
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Pretty much all of the current generation is capable. To monitor them well? You'd likely be looking at the SDS100/200.
iMONITOR
Silent Key
This is from a good friend of mine that provides reliable information:
"Yes, Oakland is going TDMA, but they will run some channels "dynamic
dual mode" to allow FTMA traffic.
No one else is following suit. A few agencies may add TDMA to their
radios to interoperate more efficiently with Oakland, but no one is
looking to transition their system or fleet any time in the
foreseeable future."
"Yes, Oakland is going TDMA, but they will run some channels "dynamic
dual mode" to allow FTMA traffic.
No one else is following suit. A few agencies may add TDMA to their
radios to interoperate more efficiently with Oakland, but no one is
looking to transition their system or fleet any time in the
foreseeable future."
iMONITOR
Silent Key
I goofed in the above post. 
"FTMA" should be "FDMA"
"FTMA" should be "FDMA"
iMONITOR
Silent Key
I've heard that as well from a few reliable sources. I'm not surprised as Oakland County has good reason why they don't want the public monitoring what goes on there!
Not the system, as not all users utilize crypto, but all the Oakland TG might be encrypted. There will still be traffic to monitor, as surrounding agencies affiliate to the towers, who not encrypt their traffic.
kd8ati
Member
On a side note how will that work with the Oakland County towers running Phase 2 and the others still on Phase 1 as far as subscriber radios go? I assume neighbor counties wont be able to affiliate to an Oakland Co site if they are still using an older radio, for example the ever-popular XTS 2500?
iMONITOR
Silent Key
P25 Phase 2 is backward compatible with Phase 1.
If a user is P1 only, then the TG they are on will be P1. That reduces the site capacity, as that repeater cannot carry two conversations.
Oakland county has always been a secretive bunch. They were reluctant to switch to MPSCS because "control".
Based on the sheriffs statement and past practice. Anything originating in Oakland Co will be encrypted. Pass through TG's obviously wouldn't be encrypted.
nsrailfan6130
Member
Is it just the Sheriff only that's going encrypt? I know in the past cities like Novi, Wixom, Rochester, etc were encrypt on the Oakland Co OpenSky system along with OCSO.
Not certain, but the outgoing system is fully encrypted, so we will not know until the transition goes live. It makes little sense to have FD traffic encrypted, especially when most of it is simulcast on analog.
nsrailfan6130
Member
iMONITOR
Silent Key
I'm beginning to see more Michigan Talk-Groups becoming encrypted. It seems to be a very gradual transition, in hopes that no one will notice. I fear we'll wake up one day to find the entire state encrypted, then the entire country!
As hardware is replaced with more modern pieces it's just inevitable it seems. With the old Astro hardware encryption was an involved process... the radio needed the proper flash and DSP, a UCM, then keys loaded. With APX gear you have various algos already in the radio, ready to go.
A lot of speculation here.
It is unknown which if any non-Oakland talk groups will be allowed on the Oakland County Simulcast in P1.
However it is pretty much set in stone that all of Oakland proprietary talk groups will be 100% AES. I would venture a guess that this includes all suburban depts.
It is unknown which if any non-Oakland talk groups will be allowed on the Oakland County Simulcast in P1.
However it is pretty much set in stone that all of Oakland proprietary talk groups will be 100% AES. I would venture a guess that this includes all suburban depts.
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