> For the complete documentation index, see [llms.txt](https://docs.xbstation.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.xbstation.com/xblink-duo/user-manual/getting-started/led-indicator.md).

# LED indicator

This article will describe the led indicator of XBLink Duo

<figure><img src="https://752643261-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-M1Ot9F_Ob2Aboz1SKNK%2Fuploads%2FYge6Ql8uh12H1vM2PAlq%2F2%20-%202026-10-22T165630.066.png?alt=media&amp;token=5301132f-6358-4ffd-a0e2-e12410e59dcd" alt=""><figcaption><p>XBLink Duo - LED</p></figcaption></figure>

## Led Map

| **LED**            | **Color** | **Description**                                |
| ------------------ | --------- | ---------------------------------------------- |
| Main               | RGB       | Indicates the status of XBLink Duo             |
| SYS1, SYS2         | Green     | Internal module status                         |
| C1, C2, LTE1, LTE2 | Green     | Status of the Cellular connection              |
| SAT                | Green     | Status of the Satellite connection             |
| ACTR               | ​Green    | Firmware status                                |
| LINK               | ​Green    | Network connection status                      |
| ACTM               | ​Green    | Telemetry data transmission status (COM ports) |
| Power led          | Red       | Inside XBLink Duo                              |

### 1. Main LED

<table data-full-width="true"><thead><tr><th width="100">Color</th><th width="231.4000244140625">Fast Blink (0.15s)</th><th width="205">Slow Blink (1.5s)</th><th width="236.5555419921875">Blink (0.7s)</th><th>Solid</th></tr></thead><tbody><tr><td><mark style="color:blue;">Blue</mark></td><td>Network Scanning</td><td>Network Scanning</td><td>Network Scanning</td><td>App Starting</td></tr><tr><td><mark style="color:red;">Red</mark></td><td>No Internet connection (Cellular &#x26; SAT signal lost). <br><strong>(Error 1)</strong></td><td><p>No Datacap or</p><p>No Internet connection</p></td><td>Not receiving signal from Cellular &#x26; SAT. <br><strong>(Error )</strong> </td><td>Not connected with SIM or Satellite device. (<strong>Error 2</strong>)</td></tr><tr><td><mark style="color:$success;background-color:green;"><strong>Green</strong></mark></td><td><ul><li>App running</li><li>Cloud connecting</li></ul></td><td><ul><li>XBFirm running</li><li>Internet connected</li><li>Cloud connecting</li><li>No sign in Pilot App</li></ul></td><td><ul><li>XBFirm running</li><li>Pilot App connecting</li><li>Cloud connected</li><li>Signed in Pilot App</li></ul></td><td><p>All good -</p><p>Connected to Pilot App</p></td></tr></tbody></table>

* **Error 1:** **Blinking Red  -** Please check the connection of XBLink Duo (Cellular Antennas, Satellite Ethernet cable, Power, etc.) and ensure your SIM cards have an active data plan.
* **Error 2:** **Solid Red -** Please insert SIM cards or connect the XBLink Duo with Satellite device.

If the main LED blinks both a <mark style="color:blue;">**blue**</mark> and other colors as shown below.

* Wait another 15-30s for the device to automatically switch between Cellular networks and Satellite to find the best available internet connection in your area.
* If after this period the internet connection is still not available, check whether the satellite device has a clear view of the sky (not blocked by a roof, trees, etc.). If it is clear and the issue persists, restart either the xblink or the satellite device.

### **2. SYS LED**

These internal SYS1 and SYS2 LEDs indicate the hardware status of the communication module.

* Blink - Firmware is uploading.
* Solid - Module is powered on and functioning normally.

### **3.** Network LEDs&#x20;

These LEDs (C1, C2, SAT) indicate the specific connection status of the dual Cellular networks and the Satellite backup.

<table data-full-width="true"><thead><tr><th width="100">LED</th><th width="231.4000244140625">Off (No LED)</th><th width="205">Slow Blink (1.5s)</th><th width="236.5555419921875">Fast Blink</th><th>Solid</th></tr></thead><tbody><tr><td>C1/ C2</td><td>No SIM card inserted</td><td>Network Scanning</td><td>Connected to Cellular network, but no internet (or out of data plan)</td><td>Internet connected successfully</td></tr><tr><td>SAT</td><td>Cable disconnected</td><td>Searching for Satellite</td><td>Connected to Satellite device, but no internet access</td><td>Internet connected successfully</td></tr></tbody></table>

### **4.** ACTM LED &#x20;

This LED indicates the status of telemetry data transmission through the COM ports.

* Blink - Telemetry data is actively transmitting between the Flight Controller and the XBLink Duo.
* Off - No data is being transmitted.

### **5.** ACTR LED &#x20;

This LED indicates the core hardware status and firmware running status.

* Solid -&#x20;
* Blink -

### **6. POWER** LED &#x20;

* Light - Power is OK
* Off - No power input