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MOTOTRBO DMR Solution

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bjornas

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Mar 22, 2020
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Hi!
I am a newbie, and need some help/advice to understand the features and possibilities to extend a DMR solution.
In my company we use a MOTOTRBO 2- way radio system to communicate between operators and control room.
The solution consists of 7 pc. MOTORTRBO SLR5500 repeaters, about 30 MOTOTRB DP4801 and 15 DM4801. The repeaters are connected to the control-room/server through fiber optic/IP. So far so good, but we need a backup solution;
In a scenario when the IP network fails, and the operators need to communicate in areas where the mobile phone carrier has bad coverage, we have a situation without possibility to communicate!
As I understand, there is a possibility to link the repeaters/server together in a Radio-Link system (VHF), correct?
Could someone please describe a dual solution for me that have both IP-link and Radio-Link?

Thanks Bjorn
 

SurgePGH

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Please understand that this is NOT a personal attack but some very sound advice. Your fourth word sets the tone. You are not even close to being qualified to dive into this. PLEASE contact your two-way radio vendor and have them come in and evaluate your situation and then present a solution. There are too many variables that are not addressed here.
 

wgbecks

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Bjorn,

Can you provide an overview of the existing IP network? Are all of the repeaters connected by fiber optic transport? If so, was the network constructed in a ring or a star configuration?

A VHF radio-link solution would not work due to the bandwidth required. A more realistic approach to consider in the event that the fiber network is not in a ring configuration would be to install something on the order of Ubiquity RF bridges in a point to point configuration with failover routing between the fiber and wireless transport at each site. An RF solution will depend upon the topography, available antenna support heights, and distance between sites.

Bill
 

buddrousa

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Retired 40 Year Firefighter NW Tenn
Who built this system?
How big of an area are the 7 repeaters trying to cover?
If it is tied together with fiber then it should be secure and very stable.
Point 2 an IP system is just that.
Which brings up the question How do you backup your network with a fall over system?
 

RFI-EMI-GUY

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Bjornas; apart from building some alternate microwave network backhaul for the IPSC, you could install RF control stations (bases programmed as a mobile subscriber) near each repeater and connect them as analog audio with SIP over public internet/VPN . Or those same RF control stations could be connected via VHF base stations. The problems will be the great distance and licensing. As an additional, I recall a European DMR solution that used VHF stations as backhaul for two TDMA slots.
 

bjornas

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Mar 22, 2020
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Bjorn,

Can you provide an overview of the existing IP network? Are all of the repeaters connected by fiber optic transport? If so, was the network constructed in a ring or a star configuration?

A VHF radio-link solution would not work due to the bandwidth required. A more realistic approach to consider in the event that the fiber network is not in a ring configuration would be to install something on the order of Ubiquity RF bridges in a point to point configuration with failover routing between the fiber and wireless transport at each site. An RF solution will depend upon the topography, available antenna support heights, and distance between sites.

Bill
Thanks for good information! I will make an overview of the network.
 

bjornas

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Mar 22, 2020
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Bjornas; apart from building some alternate microwave network backhaul for the IPSC, you could install RF control stations (bases programmed as a mobile subscriber) near each repeater and connect them as analog audio with SIP over public internet/VPN . Or those same RF control stations could be connected via VHF base stations. The problems will be the great distance and licensing. As an additional, I recall a European DMR solution that used VHF stations as backhaul for two TDMA slots.
Thanks alot for your information!
 
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