Faber M640 用户手册

Troubleshooting  •  111 

•  This problem has been seen with network adapters using the Realtek RTL8169 chip and associated low-level 

driver. In this case the NIC reports a false maximum jumbo frame size.  

•  In the NIC configuration, set the jumbo frame size set to less than the maximum allowed. In this example the 

NIC reports supporting a maximum jumbo frame size of 8384 but good acquisitions are possible only when the 
size is reduced to 7k. See 

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. and the image below. 

 

 

 

 

 

 

•  Using CamExpert, test for a good acquisition by reducing the Genie packet size used. Set the value to the new 

reduced size set in the NIC configuration.  See 

.   

•  Verify there are no packet resend messages with the Sapera tool "Log Viewer". 

 

•  This problem has also been seen with network adapters that do not support jumbo frames but still report a false 

maximum packet frame size.  

•  When using CamExpert, if the Network Configuration Mode is left as Automatic (default), CamExpert uses the 

value the NIC reports as its maximum. This maximum value is actually not supported. 

•  Test for a good acquisition by reducing the Genie packet size used. Set the value to a starting value of 1500 to 

verify acquisition before trying a higher value. See 

"

.   

 

Laptop computers with built in GigE network adapters may still not be able to stream full frame rates from Genie. 
Laptops with gigabit Ethernet PCMCIA boards may not be able to stream video at all unless network parameters are 
modified. Thorough testing is required with any laptop computer.  

Streaming video problems may change depending on the computer chipset and NIC combinations. Laptops running 
on battery power may exhibit more bandwidth issues due to the inherent power saving characteristics of laptops.  

This section describes a few configuration items to modify for best performance. Verify the Genie at the frame rates 
required or to determine the maximum frame rate possible with the laptop used.