Motorola V186 User Manual - Page 130
Digital Trunked Radio Systems, Conventional Radio Interoperability, Introduction
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Communications Digital Trunked Radio Systems In digital trunked radio systems such as ASTRO IV&D and TETRA (Dimetra), the ACE3600 uses the packet data capability of the system. The digital trunked radio system behaves as an IP network. The ACE3600 interfaces to the digital radio using an RS232 port configured to PPP protocol. For more information refer to the MDLC over ASTRO IV&D chapter in the ACE3600 STS Advanced Features Manual. Conventional Radio Interoperability Introduction Since the first MOSCAD RTU was introduced to the market, various models of Motorola conventional radios had been used with Motorola RTUs. In cases where new RTUs are added to existing systems with newer radio models, or when legacy radios are replaced with newer models, it is important to make sure the radios can interoperate in the same system. The purpose of this technical note is to provide important information on Motorola radio interoperability in control systems that use MOSCAD, MOSCAD-L, MOSCAD-M, ACE3600, and Front End Processors (FEPs) such as MCP-M and IP Gateway. The radios discussed in this document are Motorola conventional radios. Channel Monitor Resolution Parameter (MDLC Slot Time) The MDLC protocol uses a slotted time channel access algorithm for radio communications. The Channel Monitor Resolution parameter sets the time slot period (in milliseconds) in the RTU/FEP. The types of radios used in the system determine the value of this parameter (typically 100 to 300 ms). Please note that the Channel Monitor Resolution parameter should be the same in all the RTUs/FEPs in the system. When different radios are used in the system, the parameter is determined by the radio that requires the longest slot time. For example, in a system which uses both 200 ms and 300 ms radios, the Channel Monitor Resolution parameter should be set to 300 ms in all the RTUs/FEPs in the system. To determine how to set up the Channel Monitor Resolution parameter in RTUs in your system, see the table on the following page. First Warm-up Delay Parameter When the radio's PTT is activated, the radio starts transmitting a carrier wave. The other radios on the same frequency channel that receive the carrier wave activate the Channel Monitor and signal the RTU that the channel is busy. For each type of radio, there is a specific delay between the activation of the PTT in the transmitting radio and the activation of the channel monitor signal in the receiving radios. The types of radios that are used in the system determine the value of this parameter (typically 200 to 350 ms in Motorola conventional radios). 126