DMR Cap Max Traffic Channel Audio Events Show Incorrect Duration #1787
Comments
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Hello, The system I am monitoring is a Motorola DMR Tier III Capacity Max system and I listen to it Can you please make a bitstream recording, or a couple, of the control channel and send to me so that I can troubleshoot? Here is the demodulated bitstream (.bits) |
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Looks like this system is employing RAS, or non-standard CRC initial fill values. |
…e CRC mask values employed by the DMR network.
#1787 Enhance DMR CSBK CRC Calculations - Auto-Detect Alternate CRC Mask Values
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The recent PR implements an auto-correct feature for DMR CSBK (ie control) messages to detect when the DMR network is using alternate CRC mask values. However, this change alone may not resolve the original reported issue where calls are not being correctly decoded and managed and this is reflected in the call event duration values. The attached bitstream recording only contains control messaging and doesn't contain any calls. I'll need additional bistream recordings that contain calls to verify that the code fix resolves the issue. |
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The attached example is for a DMR Capacity Max system operating in 'Advantage Mode' where (only) MotoTRBO radios can register on timeslot 2 to avoid contention on timeslot 1. Timeslot 2 can also be used for voice calls when the system doesn't have any repeaters available. See conversation about 'Advantage Mode' vs 'Open System Mode' here: https://forums.radioreference.com/threads/kenwood-and-tier-3-dmr.444052/ Tell-tale characteristic of a DMR Cap Max system operating in Advantage mode is the Aloha messages on timeslot 2. |
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Additional recordings of traffic channels. |
…for CSBKO:33 and FLCO:16 (#1794) Co-authored-by: sheirerd <sheirerd@ainfosec.com>
…Adds support for voice channel update for both Open System and Advantage modes. May cause issues with Cap+ or Con+ due to changes ... needs more testing.
…Alias using ISO7 format. Updates channel details to list the tier 3 neighbors in the details.
… Con+ control channel SLCO message detection.
… Con+ control channel SLCO message detection. #1787 Adds Capacity Max talker alias FLCO. Fixes standard FLC Talker Alias using ISO7 format. Updates channel details to list the tier 3 neighbors in the details. #1787 Updates DMR capacity max event handling to better show events. Adds support for voice channel update for both Open System and Advantage modes. May cause issues with Cap+ or Con+ due to changes ... needs more testing. #1787 DMR capacity max group voice update handling.
… Con+ control channel SLCO message detection. (#1796) #1787 Adds Capacity Max talker alias FLCO. Fixes standard FLC Talker Alias using ISO7 format. Updates channel details to list the tier 3 neighbors in the details. #1787 Updates DMR capacity max event handling to better show events. Adds support for voice channel update for both Open System and Advantage modes. May cause issues with Cap+ or Con+ due to changes ... needs more testing. #1787 DMR capacity max group voice update handling. Co-authored-by: sheirerd <sheirerd@ainfosec.com>
…ion for Capacity Plus systems. (#1798) Co-authored-by: sheirerd <sheirerd@ainfosec.com>
Describe the bug
When decoding a DMR Tier III Cap Max system the call events duration value is showing 0.0 or 0.1 seconds in length.
Additional context
Attached control channel bitstream recording for troubleshooting.
20240109_170914_420750000_9600BPS_DMR_DMR_Tier_III_Site_2_Control_7.bits.tar.gz
The attached example is for a DMR Capacity Max system operating in 'Advantage Mode' where (only) MotoTRBO radios can register on timeslot 2 to avoid contention on timeslot 1. Timeslot 2 can also be used for voice calls when the system doesn't have any repeaters available.
See conversation about 'Advantage Mode' vs 'Open System Mode' here:
https://forums.radioreference.com/threads/kenwood-and-tier-3-dmr.444052/
Tell-tale characteristic of a DMR Cap Max system operating in Advantage mode is the Aloha messages on timeslot 2.
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