dmr
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dmr [2019/12/26 17:34] KD6KPC [What is a Color Code?] |
dmr [2019/12/26 17:38] KD6KPC [What is a Talkgroup?] |
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| A color code for a DMR repeater is akin to a PL tone for an analog repeater. There 15 color codes (0-15). A radio must be programmed with the correct color code to access the repeater. | A color code for a DMR repeater is akin to a PL tone for an analog repeater. There 15 color codes (0-15). A radio must be programmed with the correct color code to access the repeater. | ||
| - | This is also useful for telecommunication regulators who have to allocate the same frequency to two DMR licensees in the same region. The regulator simply has to specify a color code in the license conditions - much like PL/DPL was used in analogue as a guard tone. | ||
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| - | There is a limitation of course, if two geographically adjacent radio systems use the same frequencies, | ||
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| ===== What is a Talkgroup? ===== | ===== What is a Talkgroup? ===== | ||
| + | DMR repeaters and networks incorporate a system of “talk groups.” These are simply an ID code transmitted by the radio, that is accepted by the repeater, and retransmitted to other DMR radios on the same channel, and potentially across the Internet to other linked systems. This ID code is a simple number like “310.” In the DMR world, 310 has been given the moniker of “Tac-310.” Any radio that is set to receive Tac-310 on that repeater’s frequency channel will open the speaker and allow the transmission to pass to the end user. Any other radio not monitoring Tac-310 will remain silent. These talk groups are programmed into radios like channels. A repeater could support multiple talk groups and the end-user radio would have to have each of these talk groups programmed into separate memory channels in order to utilize them. Memory slot one could be Tac-310, memory two could be Tac-311, and memory three could be Tac-312, for example. The repeater’s frequency and access codes could all be the same with the only difference being the talk group code. It is important to know which time slot the talk group is on, as that must match. Repeaterbook tracks the talk groups available to a repeater. | ||
| ===== What is a C-Bridge? ===== | ===== What is a C-Bridge? ===== | ||
| The C-Bridge is the secret to IPSC (Internet Protocol Site Connect) which involves the linking of multiple repeaters to a single network, or to multiple networks. The C-Bridge is also the source of audio feeds of the various audio streams that make DMR what it is. The C-Bridge in essence is part database manager, part master control hub and part gateway. It is responsible for the assignment of what talk groups are available to a particular network; as well as the repeaters attached to that network. | The C-Bridge is the secret to IPSC (Internet Protocol Site Connect) which involves the linking of multiple repeaters to a single network, or to multiple networks. The C-Bridge is also the source of audio feeds of the various audio streams that make DMR what it is. The C-Bridge in essence is part database manager, part master control hub and part gateway. It is responsible for the assignment of what talk groups are available to a particular network; as well as the repeaters attached to that network. | ||
dmr.txt · Last modified: 2021/02/27 14:11 (external edit)
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