I have been listening to FCP25 lately and have noticed that some department has been doing dispatch calls to the Marietta area is transmitting as 65066 and on the Auto ISSI Patch talk groups. I have heard them make calls to Powder Springs and multiple addresses in the area. Anyone heard the same and can shed some light on whats going on?
Marietta Police Department in Fulton County P25
- Thread starter dudegt
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That's what the auto ISSI talkgroups are for. See the descriptive paragraph at the top of the list of ISSI talkgroups. The purpose of those talkgroups is to allow auto patches for users of the Cobb system to use the Fulton system in places where the Cobb system doesn't work well but the Fulton system does.
Ah got it I misunderstood what that was for makes sense now, and I assume that the 65660 is apart of the ISSI patch but just not in the id list?
MTS2000des
5B2_BEE00 Czar
What you're hearing is PCT 2 via ISSI, which is being done on a trial basis. When PCT 2 subscribers "see" a stronger signal from the Fulton system, they register and are fed traffic. The talkgroup IDs for ISSI are dynamic and may change depending on the registration data stored in the HLR/VLR in the core.
More Cobb talkgroups may be added in the future.
More Cobb talkgroups may be added in the future.
Very interesting and what a great idea. It was strange because every once in a while I will here like 2 messages on Auto ISSI chat, but this transmission from this Marietta department was on for a couple hours and happened multiple times which I found odd.
MTS2000des
5B2_BEE00 Czar
That's the way it works. ISSI roaming is just that. When a subscriber roams away from their home system, their radio registers with the foreign system, and the foreign system (if configured), passes the traffic on a temporary talkgroup for the roamer(s) affiliated on the foreign system.
How the subscriber is programmed determines how roaming performance plays out. All of our radios are set to "Home Preferred" which makes the subscriber always prefer the home network, if it's not available, then it roams. This is what you're hearing and it works well. The goal is to roam only when needed, as roaming impacts capacity on the foreign system by utilizing resources for calls, even if the roamer is just "listening".
Not sure if anyone was just listening but they are testing all the Atlanta backups 0911-0919, and North Fulton backups 0981-0986. Very interesting.
MTS2000des
5B2_BEE00 Czar
Oh, that was you? Did you say at the beginning did you say "CAR 25"?Yes, I tested them.
Wanted to make sure they were all on in case they are needed...
MTS2000des
5B2_BEE00 Czar
Yes it was me. Car 35. Radio Support. On the job, keeping tabs on the network during this (hopefully nothing...) weather event.
It makes sense to test those given the weather outlook for the next couple of hours.
MTS2000des
5B2_BEE00 Czar
We have generators at all sites, with redundant UPS. IP microwave with ring protection via fiber. We are standing by to support our stakeholders with cache radios, ICRI's for tactical patching, and spare batteries and charging stations should the need arise. The backup talkgroups were created to assist our partner entities should they need it.
Glad to hear that the emergency systems are beyond prepared for this, thank you for your work!
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