Decoding HYT XPT multi-sites

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hamtrektng

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Just curious to see if anyone has managed to capture datastream for a multi-site system on XPT (Hytera)

I am looking for an engineer to reverse this method for possible DSD+ data implementation.
 

mtindor

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I know of a company up in NE Ohio that has at least three XPT repeaters. They all serve the same entity (a transit authority). They are somehow linked, but DSDPlus doesn't currently reveal anything to suggest that they are linked.

Either (a) DSDPlus can't display such information because it hasn't been programmed to detect and process linking messages or (b) XPT linking messages perhaps only travel across the backhaul links.

I'd think though that linking information would be passed over the air -- I would think the radios should be able to roam freely between the multiple locations without anybody having to turn a dial / select a different repeater.

I know the same talkgroups are in use on all three repeaters.

Maybe I need to capture a large raw audio file from one of the sites when there is significant activity going on and send it in, with the hope that if the linking information is being sent over the air DSDPlus could be modified to display the relevant info.

Mike
 

RayAir

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The sites are linked, IP multi-site connect.
The subscribers are configured to roam, selecting the appropriate site based on the set RSSI threshold.

The XPT beacon should carry a site ID (1-30).
 

hamtrektng

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Whilst on a monitored local XPT system, I have looked through the cmd line screen and can strangely find that it switches from 1000 to 3000 consistently. Could this be linked to site info or beacon RSSI status?

Samples log:
XPT 1000
+DMR slot2 BS DATA DCC=1 CSBK ERR1 XPT Beacon 100F000000000000
+DMR slot1 BS DATA DCC=1 CSBK ERR5 XPT Beacon 100F000000000000

XPT 2000
+DMR slot2 BS DATA DCC=1 CSBK ERR1 XPT Beacon 200F000000000000
+DMR slot1 BS DATA DCC=1 CSBK ERR5 XPT Beacon 200F000000000000

XPT 3000
+DMR slot2 BS DATA DCC=1 CSBK ERR1 XPT Beacon 300F000000000000
+DMR slot1 BS DATA DCC=1 CSBK ERR5 XPT Beacon 300F000000000000

Thoughts are dearly offered
 
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