| Team Simoco
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| Designs, installs, and maintains conventional and trunked radio systems. |
| TETRA Association
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| Organization representing users, manufacturers, operators, test houses and telecom agencies for terrestrial trunked radio, an open digital trunked radio standard defined by the European Telecommunications Standardisation Institute . |
| Trunking Information
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| Information on several Motorola systems, the EDACS system which is operated by the City of Clearwater, as well as conventional frequencies for the Greater Tampa Bay Area. |
| United States Patent 5815799
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| Priority system for a wide area transmission trunked communication system. Here is the LTR Multi-Net Patent that explains the signaling protocol. |