> For the complete documentation index, see [llms.txt](https://docs.sky-drones.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.sky-drones.com/avionics/airlink-telemetry/interfaces.md).

# Interfaces

### Front side

![Front side](/files/-MdK-y17WYW4x7yRzHig)

#### ETHERNET - JST GH SM08B-GHS-TB

| Pin number | Pin name | Direction | Voltage level | Function                   |
| ---------- | -------- | --------- | ------------- | -------------------------- |
| 1          | 5V       | IN        | +5V           | Radio module power supply  |
| 2          | 5V       | IN        | +5V           | Radio module power supply  |
| 3          | ETH\_TXP | OUT       | +3.3V         | Ethernet transmit positive |
| 4          | ETH\_TXN | OUT       | +3.3V         | Ethernet transmit negative |
| 5          | ETH\_RXP | IN        | +3.3V         | Ethernet receive positive  |
| 6          | ETH\_RXN | IN        | +3.3V         | Ethernet receive negative  |
| 7          | GND      |           |               | Ground                     |
| 8          | GND      |           |               | Ground                     |

{% hint style="info" %}
The ethernet interface is decoupled with capacitors. Ethernet cable should be twisted to reduce EMI noise. Shorter cables are recommended for increased performance and higher bandwidth of the interface.
{% endhint %}

#### FAN - JST GH SM06B-GHS-TB

| Pin number | Pin name | Direction | Voltage level | Function   |
| ---------- | -------- | --------- | ------------- | ---------- |
| 1          | 5V       | OUT       | +5V           | Fan output |
| 2          | Reserved |           |               |            |
| 3          | Reserved |           |               |            |
| 4          | Reserved |           |               |            |
| 5          | Reserved |           |               |            |
| 6          | GND      |           |               | Ground     |

### Left side

![Left siide](/files/-MdK0SUWvxK9SrEdWlUo)

* SMA Antenna connector

### Right side

![Right side](/files/-MdK0bEIimpZuqHIvz6S)

* SMA Antenna connector
* Reset button

### Read side

![Rear side](/files/-MdK0phKRfYSB7BRKLPZ)

* TX LED - Transmission activity
* RX LED - Receiving activity
* LINK LED - Link activity
* CPU LED - CPU activity
* PWR LED - Power enabled
* RSSI LEDs - Received signal strength indication

RSSI LEDs status: 

* Blinking in turn: **searching for pair**
* Blinking all at once: **RF disabled**
* Solid: **RF connection established, pair found**

### Top side

![Top side](/files/-MdK1OGU2gsYL5buKczt)

The top side has an enclosure-integrated heatsink. 

{% hint style="info" %}
AIRLink telemetry module is designed to work standalone (no cooling fan) without overheating at maximum output power with ambient temperatures of up to 50° C. 

In case there is a chance of overheating in your application - the module has 4x M3 mounting holes for the cooling fan. 
{% endhint %}

### Bottom side

![Bottom side](/files/-MdK2fhJCM-DInHRo34z)

## Ground Module

### Top

The top side has an a heatsink and mounting holes for an optional fan. It's important to have a clear space to allow for airflow circulation in front of this side. 

<figure><img src="/files/f1erIG70613wVJBfR14H" alt=""><figcaption></figcaption></figure>

### Left

<figure><img src="/files/CcEqQwnVUI1bzQe7Kgep" alt=""><figcaption></figcaption></figure>

### Front

SMA antenna connectors for antennas

Status LEDs:

* TX: blinking when packets are being transmitted
* RX: blinking when packets are being received
* CPU: module operating
* RSSI: signal quality

<figure><img src="/files/mIWUtmqUgytZP31DBgtG" alt=""><figcaption></figcaption></figure>

### Right

* Reset button
* Fan port

<figure><img src="/files/dEevlY9yf48mAImeiza7" alt=""><figcaption></figcaption></figure>

### Rear

* USB to connect to computer / tablet
* Ethernet port (RJ45)
* Power supply, 7-35V DC
* Serial port

<figure><img src="/files/GLiTwtrIlvYi9lsfVCCu" alt=""><figcaption></figcaption></figure>

### Bottom

<figure><img src="/files/UZ4FLMGeUbsx5QcRsJCE" alt=""><figcaption></figcaption></figure>

{% hint style="info" %}
Looking for CAD files? They are available [here.](/avionics/airlink-telemetry/cad-model-1.md)
{% endhint %}