> For the complete documentation index, see [llms.txt](https://nxp.gitbook.io/mr-canhubk344/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://nxp.gitbook.io/mr-canhubk344/hardware/connectors-and-user-i-o/100base-t1-ethernet.md).

# 100Base-T1 Ethernet

## Location of 100BASE-T1 Ethernet Connector

<figure><img src="/files/ZJHKXytUs2U5tsRL1CSQ" alt=""><figcaption></figcaption></figure>

## Ethernet Connector

P9 is a two pin JST-GH connector provides the 100Base-T1 “two wire” Ethernet connection. The connection can plug directly into a MR-T1ETH8 network switch or other mobile robotics boards such as NavQPlus or FMURT6.&#x20;

You may need to create a simple adapter cable to adapt to other systems (such as automotive devices) which have 100Base-T1 Ethernet.&#x20;

Automotive 100Base-T1 Ethernet uses two wires to provide full duplex 100Mbps Ethernet signaling without the need for large or heavy magnetics like 100Base-TX Ethernet. The signals are capacitively coupled and there is a simple filter network before external signals reach the PHY.&#x20;

The Yellow LED (D88) on the backside of the PCB indicates the link status. Flashing indicates there is a link.

#### Connector P9:

<table><thead><tr><th width="126">Pin #</th><th width="138.33333333333331">Signal</th><th>Specification</th></tr></thead><tbody><tr><td>1</td><td>T1-P(N)</td><td>Polarity is automatically negotiated</td></tr><tr><td>2</td><td>T1-N(P)</td><td>Polarity is automatically negotiated</td></tr></tbody></table>