rfburns
Member
- Joined
- Nov 19, 2002
- Messages
- 1,029
I don't think this has been implemented. Has anyone ever heard this in operation? What are the VHF frequencies? What is a region? Is the region mentioned here the same boundaries as the MAC channel regions? Note that this says a NEW VHF channel shall be installed. It does not refer to existing CSP VHF channels etc. I snipped the part about the use of NLEEC as that should be obvious.
State of Colorado
Digital Trunked Radio System
VHF - 800 MHz. Interoperability
One of the key issues with the migration from the existing VHF (150 MHz.) conventional radio system to the 800 MHz. digital trunked radio system (DTRS) is inter-operability between the two systems. There are two scenarios that require this type of inter-operability. The first is for users who choose not to, or cannot afford to migrate when the state does. The second is for users who reside in an area that is not yet converted to the DTRS and travel into an area that has been converted. These requirements exist for communications between various state agencies and/or with local and federal agencies
In the design of the DTRS both of these scenarios have been considered and two methods will be available to establish inter-system inter-operability. The primary method will be to use inter-system access channels. The secondary method is to use the National Law Enforcement Emergency Channel (NLEEC)
PRIMARY METHOD
This method will be implemented to meet the requirements for users who reside in an area that has not migrated to the DTRS and travels into an area that has already migrated, and for direct unit to unit communications between users on the DTRS and those using existing VHF systems.
A new VHF channel will be installed at the state tower locations when the DTRS is installed. This access channel will be the same within geographic regions. Different regions will have different access channels in order to prevent interference. These new VHF access channels will be permanently cross patched to a specific channel (talkgroup) in the DTRS. VHF system users will need to have the access channel(s) programmed into their radios. All radios on the DTRS will have the access channels. Users on both systems should scan the common channels for optimum usability.
When a VHF users needs to communicate with a DTRS user, They will select the DTRS access channel and call the unit they wish to communicate with, whose scanner will hear the calling unit. The called unit will then select the access channel allowing direct communications. This method will also work in the other direction when a DTRS user needs to talk to a VHF user. Multiple access channels will be installed in areas where one channel is not sufficient for high volumes of radio traffic.
The need for inter-system inter-operability was defined very early in the planning for the DTRS. It is a high priority in the technical system design and will be an integral part of the system implementation. With 2 methods available to achieve inter-operability, local and federal users will continue to be able to communicate with state agencies and with each other.
State of Colorado
Digital Trunked Radio System
VHF - 800 MHz. Interoperability
One of the key issues with the migration from the existing VHF (150 MHz.) conventional radio system to the 800 MHz. digital trunked radio system (DTRS) is inter-operability between the two systems. There are two scenarios that require this type of inter-operability. The first is for users who choose not to, or cannot afford to migrate when the state does. The second is for users who reside in an area that is not yet converted to the DTRS and travel into an area that has been converted. These requirements exist for communications between various state agencies and/or with local and federal agencies
In the design of the DTRS both of these scenarios have been considered and two methods will be available to establish inter-system inter-operability. The primary method will be to use inter-system access channels. The secondary method is to use the National Law Enforcement Emergency Channel (NLEEC)
PRIMARY METHOD
This method will be implemented to meet the requirements for users who reside in an area that has not migrated to the DTRS and travels into an area that has already migrated, and for direct unit to unit communications between users on the DTRS and those using existing VHF systems.
A new VHF channel will be installed at the state tower locations when the DTRS is installed. This access channel will be the same within geographic regions. Different regions will have different access channels in order to prevent interference. These new VHF access channels will be permanently cross patched to a specific channel (talkgroup) in the DTRS. VHF system users will need to have the access channel(s) programmed into their radios. All radios on the DTRS will have the access channels. Users on both systems should scan the common channels for optimum usability.
When a VHF users needs to communicate with a DTRS user, They will select the DTRS access channel and call the unit they wish to communicate with, whose scanner will hear the calling unit. The called unit will then select the access channel allowing direct communications. This method will also work in the other direction when a DTRS user needs to talk to a VHF user. Multiple access channels will be installed in areas where one channel is not sufficient for high volumes of radio traffic.
The need for inter-system inter-operability was defined very early in the planning for the DTRS. It is a high priority in the technical system design and will be an integral part of the system implementation. With 2 methods available to achieve inter-operability, local and federal users will continue to be able to communicate with state agencies and with each other.
