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site trunking question

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MTS2000des

5B2_BEE00 Czar
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While it's technically possible to have all 14, 15, whatever subsites in a simulcast in failsoft I think it's a bad design. If subscriber A only gets into subsites 1, 2 and 3 units close to other subsites may not hear the traffic and talk at the same time on subsites 9, 10 and 11, causing bad interference in overlap areas.
In a single zone LSM build, it makes perfect sense, considering the fleet mapping. In our case, several users/stakeholders we dispatch for roam the
ENTIRE zone whereas some are geographically separated. When we designed the failsoft plan, we did try to geo-isolate the users from each other failsoft frequency wise. But when you only have 11 channels to work with, you're going to have some people on failsoft frequencies sharing with each other. In this case, we did this by agency type/response plan relative. (In other words, we have SO, which is a countywide entity, sharing F/S with our county marshals, school police, etc which are all countywide ops wise and law related and often back each other up on high priority calls).

This was the most difficult stages of fleet mapping for our agency.

Ah, DSR is such a wonderful thing if you're lucky enough to have it! :D
Must be nice to be able to afford it. Out of all the Astro 25 deployments in my town, (13 or so), only 1 has DSR (take a guess, the one with the most money)
 

Project25_MASTR

Millennial Graying OBT Guy
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Can confirm, pre-7.16 individual sub-sites can and will go into failsoft independently.

Post-7.15, I seem to remember an option being present to disable subsites during prime site link downs. Something about dual controller failure there is a semi-coordinated failsoft launch at the associated sub-sites but if an individual sub goes down due to a link issue the sub will take itself down. I want to say there were also some limitations attached that required a co-located prime site.
 

KevinC

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Can confirm, pre-7.16 individual sub-sites can and will go into failsoft independently.

Post-7.15, I seem to remember an option being present to disable subsites during prime site link downs. Something about dual controller failure there is a semi-coordinated failsoft launch at the associated sub-sites but if an individual sub goes down due to a link issue the sub will take itself down. I want to say there were also some limitations attached that required a co-located prime site.

If an idividual subsite loses it's site link it will be voted-out. If it went into failsoft you would have major interference as the other subsites would still be wide-area.

If your prime site loses connectivity to the ZC you go into site trunking.

If you lose your prime site ( and don't have geo-prime) you either go dark or into failsoft if enabled.
 
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I guess I need to find out what version we are running for a definitive answer. The state put 2 sites up and our county built 2 more for indoor coverage issues, I'm assuming everyone is on the same version.
This is my collection of P-25 docs, I'll add to it if anyone here has more info to offer.

thanks
 

Project25_MASTR

Millennial Graying OBT Guy
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I guess I need to find out what version we are running for a definitive answer. The state put 2 sites up and our county built 2 more for indoor coverage issues, I'm assuming everyone is on the same version.
This is my collection of P-25 docs, I'll add to it if anyone here has more info to offer.

thanks

Jay, that P25_audio.pdf is a good read. I actually did a test similar to that (primary difference was a different Tascam recorder, used a computer as a tape source and didn't loop it back in, used an XTS5000 instead of the XTS3000). The article with audio links (free to use) is on my LinkedIn profile.
 
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