2) Setting Jumbo Packets (Jumbo Frames) The GigE camera image is transferred to the PC in a series of UDP Packets. Each time the PC receives an Ethernet packet, a PC interrupt takes place. Each interrupt disturbs the image transfer flow and causes CPU loading and possible packet drops due to several OS internal switchover processes. The smaller the packet size, the more interrupts that will occur. The larger the packet size, the more efficient the image transfer will be. For best performance, the NIC should be set up to use Jumbo Packets (sometimes called Jumbo Frames) which are 9014 bytes in size.
This will increase the network performance, decrease the PC’s CPU load, and minimize packet drops. a. Click on each NIC in turn. b. Click on Properties. c. Click on Configure button next to the network card description. d. Click on Advanced. e. Set Jumbo Packets to 9014 or maximum value. Using Sentech STC-M Cameras with AutoVISION and Visionscape Page 8 of 32