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Hawaii Preliminary Technics! Assessment (CTAP-HUHA-PREASSESS-00/-RO'.. • The US National Park Service utilizes a P25 VHF system. • The US Military has a stand alone, P25 UHF trunked system. Off island systems: • Maui -The main system on Maui is the County 800 MHz EFJohnson Multi-Net II trunked radio system. This is a proprietary radio system. Oahu -The main system on Oahu is the Honolulu 800 MHz M/A-COM EDACS trunked radio system. This is a proprietary radio system. • Kauai -The main system on Kauai is the County 800 MHz Motorola SmartNet II trunked radio system. This is a proprietary radio system. The key point for interoperability (without using a gateway) is that the subscriber unit must match the fixed infrastructure by using the same frequency band and the same radio protocol. For example, if the County installs a P25 700/800 MHz system, the County subscriber radios will not necessarily be able to communicate on any of the three other county 800 MHz systems since they use proprietary protocols. However, if the County purchases subscriber radios from one of the vendors of the proprietary protocol, they could have both the P25 protocol and the vendor's proprietary protocol. Likewise the other counties could purchase subscriber radios with both their proprietary protocol and the P25 protocol so they could communicate on the Hawaii County system when visiting the County by switching to the County profile. Utilizing the same frequency band does not guarantee interoperability with all users of the same band due to differences in system design and the potential use of proprietary protocols. Additionally, the ?use of P25 protocol does not guarantee interoperability across all frequency bands unless multi-band .subscribers are used. We understand the State has future plans to upgrade to a 700 MHz P25 system. At that time, if the County chooses to install a 700 and/or 800 MHz system, it would have level 5 interoperabilityZ with •the State as long as the State and County each purchase dual 700/800 MHz subscriber units. Another option for interoperability with the other Counties is for either the State or County to integrate the 800 MHz NPSPAC channels into the new trunked system for use on the island. The existing radios carried by the users on Maui, Oahu, and Kauai are capable of operating on NPSPAC channels in the conventional analog mode of operation. These conventional channels should be added to the system regardless if the trunked system operates on VHF or 800 MHz. 2.4 Project 25 Interoperability The P25 Land Mobile radio (LMR) standards have been developed to enhance interoperability for public safety radio users. The standard is contained in a suite of more than 60 documents maintained by the Telecommunications Industry Association (TIA). All P25 compliant radios are able to communicate with each other while being backward compatible with legacy analog FM radios, when in the same frequency band. P25 is a digital standard, which enhances bandwidth efficiency and provides other advantages. Both voice and (optionally) low speed data services are covered. From its inception, Project 25 has had four primary objectives: • To enable effective inter-agency communications z Level 5 is a Standazds-based Shazed System according to the SAFECOM Interoperability Continuum October 2008 9 .