Typical System Capabilities
Like any trunked system, LTR MultiNet allows users to be grouped to virtual channels on a system backbone. The system backbone consists of repeaters configured to support the LTR protocol. The virtual channels, called system and group, are controlled by the system electronics. In an LTR system, the electronics that set up communications between radios are housed in each radio set, (scan-based). The MultiNet system has some form of central controller in addition to the scan-based radio electronics. When idle, radios scan all system channels searching for a valid system-and-group call. When a valid call is detected, all radios set to the detected system and group, (virtual channel) meet on a physical channel and can communicate. A valid call could be an individual call or a call to a group of radios.
There are group virtual channels, where groups of mobile and hand held radios are addressed based on their system and group (virtual channel selector) setting. On a commercial system, a typical group might be a small business such as a towing company. On a government system, a typical group might be a group of people in a department with similar tasks such as the city street department. When any user in the group talks, all radios with their selector set to that group meet on a virtual channel and can communicate. When the conversation ends, radios immediately begin a search for another call.
Units can be individual-called: a dispatcher can call a single mobile or hand-held radio and initiate a conversation that will not be heard by any other radios in the system. A form of individual call is the telephone patch. Some systems allow half-duplex telephone calls to be placed. The radio user must use the push-to-talk button to speak and cannot talk and receive simultaneously.
Unlike central-controlled trunked systems, LTR MultiNet does not provide a busy queue. If a user gets a busy signal, they will not automatically be called when a channel becomes available.
Radios have an "emergency" capability which can alert a dispatch center that the person with the radio has pressed an emergency button and needs assistance.
Read more about this topic: LTR Multi Net
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