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Motorola P25 configuration question

pfdradio

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This is really for P25 system configuration folks. My County operates a phase 1 P25 system on UHF. They are claiming that there is a capacity issue due to the way they do the radio ID's. I do not know enough to say if that is even plausible. So if anyone does P25 system setup, maybe they can shed some light on this.
 

gatekeep

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Depends on the system. Pure P25 trunking systems can have RID's ranging from 1 to 16777213 (or 1 to FFFFFB for those hexadecimal inclined). Or if it is a SmartNet/SmarZone system as KevinC suggests the maximum assignable RIDs per zone is 1 to 65534 (or 1 to FFFE in hexadecimal).
 

KevinC

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Depends on the system. Pure P25 trunking systems can have RID's ranging from 1 to 16777213 (or 1 to FFFFFB for those hexadecimal inclined). Or if it is a SmartNet/SmarZone system as KevinC suggests the maximum assignable RIDs per zone is 1 to 65534 (or 1 to FFFE in hexadecimal).
You can use any ID in the 1 to 16 million range on a MSI P25 trunking system, but you are limited to 64,000 per zone.
 

pfdradio

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64,000 per zone. Can someone help me out? What is a Zone? Is there a standard number of zones or is it a system by system number? Please excuse my lack of knowledge.
 
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Motorola trunking systems are broken into cores called zones. This directly correlates to the RFSS, i.e. a RFSS of 1 means Zone 1, RFSS or 2 means Zone 2, etc. To simplify the layout, radio communication takes play at two controller levels. The site controllers control the chaos that is trunking while the zone controllers hold the user/talkgroup databases and create links between sites for specific talkgroups.

Logically it looks something like this. When a radio attempts to access a site, the site controller asks the zone controller if that unit ID is allowed (this is called registration). If yes, the radio will then attempt to ask for talkgroup resources to be provisioned at the site. Again, the site controller will ask the zone controller and if yes, the process of affiliation has been completed. On the backend, the zone controller keeps track of what talkgroups are in use at what sites. If a talk group is used at multiple sites, the zone controller will "route" the talkgroups between the sites. If that info needs to go beyond the zone controller to an adjacent zone...the zone controller simply forwards it to the other zone controllers.

There are several types of Cores.
K-Core, which is a conventional core.
L-Core, which is sometimes known as a Lite Core as it is really aimed for the smaller systems that don't need hundreds of sites or only have a small simulcast system.
M-Core, which is the full featured, multi-zone capable setup.

@KevinC one thing just came to mind, I believe there are some limitations of M1's if I am remembering correctly. More than 2500 users requires a system license be purchased (not upgrading to a M2 though). Just came to mind as a local system recently went through that.
 

rescue161

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If it is a Harris system, then it is a little bit different. You get so many talk groups and radio IDs per "agency" (Harris term). If they didn't create their fleetmaps to include future growth, then they may have agencies in the UAS that may be maxed out.
 

pfdradio

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It is a Motorola system and they said there was an issue with how many "radio id's" due to an error on the original setup. I just didn't know if this was legitimate. I believe that they are in excess of 2500 radios on the system now.
 
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