# How are the LED signals on the breakout header on GigaBlox Rugged wired?

**URL:** <https://forum.botblox.org/t/how-are-the-led-signals-on-the-breakout-header-on-gigablox-rugged-wired/191>\
**Category:** BotBlox Hardware\
**Tags:** gigablox-rugged\
**Created:** [April 9, 2024, 5:35pm UTC](https://forum.botblox.org/t/how-are-the-led-signals-on-the-breakout-header-on-gigablox-rugged-wired/191 "2024-04-09T17:35:53Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![botblox\_admin](https://yyz1.discourse-cdn.com/flex027/user_avatar/forum.botblox.org/botblox_admin/32/1_2.png) [@botblox\_admin](https://forum.botblox.org/u/botblox_admin)\
**Post date:** [April 9, 2024, 5:35pm UTC](https://forum.botblox.org/t/how-are-the-led-signals-on-the-breakout-header-on-gigablox-rugged-wired/191/1 "2024-04-09T17:35:53Z")

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_– Copied from customer query –_

I’m currently designing a PCB to interface with the GigaBlox Rugged Gigabit Switch LED header - with D1-8, and VCC. Which LED output is for which colour / port? It’s not clear from the datasheet.

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<div class="post-metadata">

**Author:** ![josh\_elijah](https://yyz1.discourse-cdn.com/flex027/user_avatar/forum.botblox.org/josh_elijah/32/568_2.png) [@josh\_elijah](https://forum.botblox.org/u/josh_elijah)\
**Post date:** [April 9, 2024, 6:06pm UTC](https://forum.botblox.org/t/how-are-the-led-signals-on-the-breakout-header-on-gigablox-rugged-wired/191/2 "2024-04-09T18:06:31Z")

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You’re right, this is not clear from the datasheet. Below is the header pinout.

 ![image](https://canada1.discourse-cdn.com/flex027/uploads/botblox1/original/1X/1d980e9bb2dc4f42d9270d4db472c46d3530119e.png)

The leds work in 2 bit mode, so the two signals are combined to show port speed as colour, and port activity as blinking.

1Gbps link = Green LED on, Red LED off.  
100Mbps link = Green and Red LED on (Orange colour)  
10Mbps link = Green LED off, Red LED On

When there is traffic, the LEDs that are on will blink. For example, this results in a blinking orange LED for activity on a 100Mbps link, and a linking green LED for activity on a 10Mbps link.

**Port 1**  
D1 - Green LED  
D2 - Red LED

**Port 2**  
D3 - Green LED  
D4 - Red LED

**Port 3**  
D5 - Green LED  
D6 - Red LED

**Port 4**  
D7 - Green LED  
D8 - Red LED

So if you will always have a 1G or 100M link, you can just use the green LED as a port activity indicator. If you could have a 1G, 100M or 10M link, then you need to use both signals, either on a dual color LED, or by ORing the signals to get a single signal for port activity.

Note that there is already a 1K resistor on the anode of each line, so you can add an external LED directly without needing to add a current limiting resistor.