Since there seems to be a huge amount of confusion about VIPER, NCSHP low band, and interops stuff, here's the skinny.
VIPER is not a state radio system, it is an interoperability system for which the state is the trustee and coordinator. It consists of state, local, and federal infrastructures, and all are sharing their portions of the costs.
There is an 800 mHz radio system that belongs to the state being built out, and included in that infrastructure are substantial portions of the infrastructure for VIPER.
Local and other entities may own their own portions of the interoperability infrastructure.
Interoperability protocols affect only the designated mutual aid frequencies, not the individual operating frequencies of the various agencies involved, though the equipment can be made capable of tying any number of systems and frequencies together on an elective basis when necessary.
Some talkgroups will be shared by all agencies, some will be restricted to respective agency proprietary use, and some will be available to particular authorized users from other departments by agreements between the individual departments.
For municipalities and entities not going with 800 mHz radio systems that match the state's 800 mHz system, their mutual aid frequencies will be interconnected to the interops freqs/talkgroups by the methods appropriate to the type of systems.
A VHF or UHF trunked system that has the matching protocols for any of the participating 800 mHz systems can be seamlessly connected simply by patching together the appropriate system respective talkgroups. This can be a permanent patch or an elective patch.
Some sites are state owned and have local and/or federal infrastructure included.
Some sites are state owned and have no local or federal infrastructure included.
Some sites are local and have state and/or federal infrastructure included.
Some sites are local and have no state or federal infrastructure included.
Some sites are federally owned and have local and state infrastructure as tenants.
Shared sites may utilize shared frequencies for various talkgroups that are not shared.
Federal frequencies are not shared by local or state agencies.
Some designated sites have interconnection systems to tie local infrastructure(s) to mutual aid infrastructure(s) for interops capabilities when and where that capability is necessary.
The NCSHP low band system is going to be around for a good while because it will take some time to fully implement the 800 mHz system.
The NCSHP high band system is being phased out and will not be a part of VIPER.
In those counties where the 800 mHz system is online, 800 mHz portables have been issued, and the high band systems in the cars, including the vehicular repeaters, are being removed. When the troopers are out of the vehicle, they will utilize the 800 mHz portables in place of the high band radios and repeaters.
In those counties where the 800 mHz system is online, the troopers will use the low band when in the car, and the 800 mHz portable when out of the car.
In those counties where the 800 mHz system is online, the low band dispatch only is multicast on the 800 mHz system, but the low band mobile-to-base frequency is not repeated over the 800 mHz system.
Hope some of this helps.
VIPER is not a state radio system, it is an interoperability system for which the state is the trustee and coordinator. It consists of state, local, and federal infrastructures, and all are sharing their portions of the costs.
There is an 800 mHz radio system that belongs to the state being built out, and included in that infrastructure are substantial portions of the infrastructure for VIPER.
Local and other entities may own their own portions of the interoperability infrastructure.
Interoperability protocols affect only the designated mutual aid frequencies, not the individual operating frequencies of the various agencies involved, though the equipment can be made capable of tying any number of systems and frequencies together on an elective basis when necessary.
Some talkgroups will be shared by all agencies, some will be restricted to respective agency proprietary use, and some will be available to particular authorized users from other departments by agreements between the individual departments.
For municipalities and entities not going with 800 mHz radio systems that match the state's 800 mHz system, their mutual aid frequencies will be interconnected to the interops freqs/talkgroups by the methods appropriate to the type of systems.
A VHF or UHF trunked system that has the matching protocols for any of the participating 800 mHz systems can be seamlessly connected simply by patching together the appropriate system respective talkgroups. This can be a permanent patch or an elective patch.
Some sites are state owned and have local and/or federal infrastructure included.
Some sites are state owned and have no local or federal infrastructure included.
Some sites are local and have state and/or federal infrastructure included.
Some sites are local and have no state or federal infrastructure included.
Some sites are federally owned and have local and state infrastructure as tenants.
Shared sites may utilize shared frequencies for various talkgroups that are not shared.
Federal frequencies are not shared by local or state agencies.
Some designated sites have interconnection systems to tie local infrastructure(s) to mutual aid infrastructure(s) for interops capabilities when and where that capability is necessary.
The NCSHP low band system is going to be around for a good while because it will take some time to fully implement the 800 mHz system.
The NCSHP high band system is being phased out and will not be a part of VIPER.
In those counties where the 800 mHz system is online, 800 mHz portables have been issued, and the high band systems in the cars, including the vehicular repeaters, are being removed. When the troopers are out of the vehicle, they will utilize the 800 mHz portables in place of the high band radios and repeaters.
In those counties where the 800 mHz system is online, the troopers will use the low band when in the car, and the 800 mHz portable when out of the car.
In those counties where the 800 mHz system is online, the low band dispatch only is multicast on the 800 mHz system, but the low band mobile-to-base frequency is not repeated over the 800 mHz system.
Hope some of this helps.
Last edited: