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LTR MultiNet
LTR MultiNet Systems are APCO-16 compliant LTR Trunked Radio Systems and thus are mostly found in use as public safety systems. LTR MultiNet systems usually have one or more "status channels" that act like a control channel in a Motorola or EDACS system, however these channels can also carry voice transmissions simultaneously.
==APCO 16 compliance==
Some trunked systems queue calls if a user's attempt to transmit gets a busy signal. In other words, if someone presses their push-to-talk button and all trunked radio system channels are busy, some systems will wait-list users in the same order as their busy signals occur. When a channel becomes available, the system notifies the user. There is disagreement about MultiNet's ability to queue calls when all channels are busy.〔An article claiming MultiNet ''does'' queue calls is: "4.2.4 Logic Trunked Radio (LTR)," ''Arizona Phase II Final Report: Statewide Radio Interoperability Needs Assessment,'' (Phoenix, Arizona: Macro Corporation and The State of Arizona, 2004), pp. 46.〕 Usually, the control channel is the path allowing wait-listed users to get in line. One publication says MultiNet communicates using low baud rate data multiplexed under voice if all channels are busy. One report says MultiNet users on a live system who got a busy had to either hold their push-to-talk button down continually until the system assigned them a channel or periodically check for an available channel by repeatedly pressing the push-to-talk.〔"3.4 Radio System Deficiencies," ''San Rafael Police Radio Committee: Report to Mayor and City Council'', (San Rafael, California: City of San Rafael, 1995,) pp. 13.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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