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1 **Table of Contents:**
2
3 {{toc/}}
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5
6 = 1. Introduction =
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8
9 Dragino Gateway is possible to support (LBT) Listen Before Talk feature with [[LA66 USB LoRaWAN Adapter>>doc:Main.User Manual for LoRaWAN End Nodes.LA66 LoRaWAN Module.WebHome]].
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11
12 **Below list the support products and Requirements:**
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14 1. LoRaWAN Gateway model:  [[LIG16>>url:http://www.dragino.com/products/lora-lorawan-gateway/item/171-lig16.html]], [[LG308N>>http://www.dragino.com/products/lora-lorawan-gateway/item/140-lg308.html]], [[DLOS8N>>http://www.dragino.com/products/lora-lorawan-gateway/item/160-dlos8.html]],[[LPS8N>>http://www.dragino.com/products/lora-lorawan-gateway/item/148-lps8.html]]
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16 2.  Firmware version since :  [[LBT~~-~~-build-v5.4.1658454438>>https://www.dragino.com/downloads/index.php?dir=LoRa_Gateway/LPS8/Firmware/Release/LBT--build-v5.4.1658454438-20220722-0948/]]
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18 = 2. How to use =
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20
21 Connect the LA66 module to the USB port on the side of the gateway.
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24 [[image:image-20220722110817-2.jpeg||height="456" width="608"]]
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26
27 == 2.1 Upgrade File ==
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30 Upgrade the gateway firmware to the LBT version for specific device [[Firmware download>>https://www.dragino.com/downloads/index.php?dir=LoRa_Gateway/LPS8/Firmware/Release/LBT--build-v5.4.1658454438-20220722-0948/]]. This LBT version firmware support LBT by default, users just need to plug in the LA66 USB LoRaWAN Adapter.
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32
33 == 2.2 Debug ==
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35
36 Apply and save on the web after the above configure has been made
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38 (((
39 run "(% style="color:#037691" %)**logread -f**"(%%) in Linux to check the LBT running status.
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41 If LA66 module returned the value "(% style="color:#037691" %)**FREE"**(%%), indicating that can be downlinked normally.
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43 If LA66 module returned the value "(% style="color:#037691" %)**BUSY"**(%%), indicates that the downlink can be disturbed.
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45 Received signals greater than -85dBm return "(% style="color:#037691" %)**BUSY"**(%%), less than return "(% style="color:#037691" %)**FREE"**
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47 [[image:image-20220705110001-5.png||height="681" width="1375"]]
48
49
50 == 2.3 Trouble Shootings ==
51
52 === 2.3.1 How to debug if LBT does not work ===
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54
55 Make sure that the gateway is connected to the LA66 module, Can check by command or via the Web UI.
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57 [[image:image-20220705104342-4.png||height="760" width="1005"]]
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60 [[image:image-20220705104316-3.png||height="574" width="1005"]]
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63 Access LA66 module log will show CP210X Converter Now Attached to **ttyUSBX**
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65 [[image:image-20220705111448-6.png||height="249" width="1003"]]
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67
68 )))
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