You need to test, we're here to help.

You need to test, we're here to help.

17 October 2017

Automotive Ethernet Compliance: Tests in Detail (Part IV)

The specified pass/fail mask for the  transmitter power spectral density test
Figure 1: The specified pass/fail mask for the
transmitter power spectral density test
We've been making our way through a detailed accounting of the compliance tests for Automotive Ethernet, and in our last post, we covered the distortion test. Now we'll wrap up the tour of the compliance test suite with the test of transmitter power spectral density.

12 October 2017

Automotive Ethernet Compliance: Tests in Detail (Part III)

This depicts the setup for the Automotive Ethernet transmitter distortion test
Figure 1: This depicts the setup for the Automotive
Ethernet transmitter distortion test
Among the compliance tests specified for Automotive Ethernet in the 100Base-T1 spec, none is more complex to set up than the test for transmitter distortion. As with the transmitter timing slave jitter test described in an earlier post, it requires access to the DUT's transmit clock (TX_TCLK).

19 September 2017

Automotive Ethernet Compliance: Tests in Detail (Part II)

Figure 1: Testing transmitter timing master jitter
entails creating a track of TIE measurements
We've begun our deep dive into the subject of Automotive Ethernet compliance testing. In our last post, we covered the first two of seven tests: maximum transmitter output droop and transmitter clock frequency. Let's now look at transmitter timing jitter in master and slave modes.

13 September 2017

Automotive Ethernet Compliance: Tests in Detail (Part I)

Maximum transmitter output droop should not exceed the specified maximum of 45%
Figure 1: Maximum transmitter output droop should not
exceed the specified maximum of 45%
We've looked in past posts at the basics of Automotive Ethernet compliance test, the five test modes, and an overview of the test setup. Now it's time to begin examining the physical-layer electrical tests in detail. As we've mentioned, there are a total of seven of these tests (six for BroadR-Reach and 100Base-T1 and one for the latter only).

08 September 2017

Automotive Ethernet Compliance: Test Setup Overview

Typical test setup for Automotive Ethernet PMA compliance test
Figure 1: Typical test setup for Automotive Ethernet
PMA compliance test
Our last post, an overview of the five test modes for Automotive Ethernet electrical compliance testing, prepared us for a deeper look at the compliance tests themselves. But before diving into details on the differential electrical compliance tests for Automotive Ethernet, be it BroadR-Reach or 100Base-T1, it might be helpful to take a look at the setup for this endeavor.

30 August 2017

Automotive Ethernet Compliance: The Five Test Modes

Automotive Ethernet electrical compliance test is defined at the connector of the transmitter
Figure 1:Automotive Ethernet electrical compliance test
is defined at the connector of the transmitter
Following up on our introduction to Automotive Ethernet compliance testing, let's move on to an overview of the five test modes that comprise the compliance test suite for the 100Base-T1 protocol. The test modes allow for a common pattern to test stressful conditions across all devices. Testing in this fashion offers the best possible odds for achieving true interoperability.

24 August 2017

Introduction to Automotive Ethernet Compliance Testing

As with most any networking scheme, Automotive Ethernet is subject to standardization to ensure that the various components of a given system reliably pass signals among themselves. Where there is a standard for a protocol, there must also be testing for compliance with that standard. This will be the first in a series of posts detailing compliance test of the Physical Media Attachment (PMA) aspect of the Automotive Ethernet standard.