TS-4900 Errata: Difference between revisions

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The PHY's published errata [http://ww1.microchip.com/downloads/en/DeviceDoc/80000692B.pdf here] includes items for "1000BASE-T Transmitter Jitter fails to meet IEEE compliance specification" and "1000BASE-T Transmitter Distortion fails to meet IEEE compliance specification".  Both can cause linking issues, and the Jitter bug can cause packet loss with some link partners at 1000Base-T.
The TS-4900 PHY's published errata [https://ww1.microchip.com/downloads/en/DeviceDoc/80000692D.pdf here] includes items added on 07-26-16 for "1000BASE-T Transmitter Jitter fails to meet IEEE compliance specification" and "1000BASE-T Transmitter Distortion fails to meet IEEE compliance specification".  Both errata can cause linking issues, and the Jitter related errata can cause packet loss with some link partners at 1000Base-T.
| If an issue is seen with a specific link partner either you must use a known good switch, or reduce the ethernet speed to 100Mb/s.
| Change out the link partner on the other end of the network cable.  If the PHY in the linked device meets or exceeds the IEEE specs it will compensate for the errata of the PHY on the TS-4900.  Alternatively reducing the ethernet speed to 100BASE-T should resolve the issue.
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Latest revision as of 14:55, 26 February 2021

Errata Description Fix/workaround.
PHY violates IEEE specification for jitter

The TS-4900 PHY's published errata here includes items added on 07-26-16 for "1000BASE-T Transmitter Jitter fails to meet IEEE compliance specification" and "1000BASE-T Transmitter Distortion fails to meet IEEE compliance specification". Both errata can cause linking issues, and the Jitter related errata can cause packet loss with some link partners at 1000Base-T.

Change out the link partner on the other end of the network cable. If the PHY in the linked device meets or exceeds the IEEE specs it will compensate for the errata of the PHY on the TS-4900. Alternatively reducing the ethernet speed to 100BASE-T should resolve the issue.