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Link Configuration

 

Duplex Mode

For a properly functioning AVB link, both ends of the Ethernet connection need to be set up for full-duplex operation at the same bit rate.  

This means that both ends of the connection must be set to the same mode: either both ends should be set to autonegotiation, or both ends should be manually configured for 100 Mbps full duplex.

If one device is set to autonegotiation and the second device is manually configured, then the autonegotiation process will fail.  The first device will revert to a half-duplex connection, which will typically cause dropped packets and prevent PTP lock.

 

Link Mode Selection

The Streamware NIC-1, Analyzer GbE, and Analyzer BR all support autonegotiation as well as manual 100 Mbps full-duplex modes.  Be sure to select the mode that matches the configuration of the other Ethernet or BroadR-Reach endpoint or bridge being connected.  Here are a few guidelines:

  • Most AVB-capable bridges default to autoconfiguration mode
  • Most professional audio endpoints use autoconfiguration mode
  • Most Ethernet to BroadR-Reach media converters require autoconfiguration mode
  • Many automotive ECUs that use standard Ethernet with RJ-45 jacks use manual 100 Mbps full-duplex mode
  • Using a direct BroadR-Reach connection with an Analyzer BR requires manual 100 Mbps full-duplex mode

Please consult the documentation for the other endpoint or bridge for specifics as to how to confirm or change the connection mode.  

 

Checking the Link State

 With Streamware Workbench, it's easy to tell if the link is operating in full-duplex or half-duplex mode.  Just check the link status indicator in the lower-right corner of the Workbench Controller window:

This shows that the Ethernet link is properly configured on this end for full-duplex operation in standard Ethernet mode.

If the link is configured incorrectly, the link status indicator will flash red:

 

In that case, the link configuration is mismatched.  Note that is is possible for the indicator to be green and the duplex state to still be mismatched on the other end.

 

Checking the Link State

 To set the link state for your NIC-1, Analyzer GbE, or Analyzer BR, you'll need to navigate to the network settings for the NIC-1. Here's how to get there:

  • Go to Control Panel
  • Go to Network and Internet, then Network and Sharing Center
  • Click on Change Adapter Settings
  • Right Click on the NIC-1 and choose Properties
  • Click on Configure

Once you've clicked on Configure, go to the Advanced tab and look for the Speed & Duplex option:

 

 Change the value on the right to the desired setting:

 

Now when you run Workbench, the link status should reflect the new settings.

 

Posted on November 11, 2014

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