Rad-icon 1520 GigE User Manual
15
Teledyne DALSA
GigE Vision framework for Sapera LT installation
The GigE Vision framework installs the GigE Vision Module for Sapera and includes the
Network Imaging package which is required to access a GigE Vision detector.
Refer to the “GigE Vision Module for Sapera” user manual and “Network Imaging
Module for Sapera LT” user manual which are included in the installation.
Optimizing Settings
The performance of the gigabit Ethernet connection on the host computer generally can
be improved by adjusting some settings in the NIC. The below advices refer to the Intel
Gigabit CT desktop adaptor. For a more detailed explanation please refer to “Network
Optimization Guide (PDF)” and “Network Imaging User’s Manual (PDF)” which is part
of the Sapera LT software package.
To reduce the interrupt overhead in the host the following settings in the NIC are
advised.
Packet Size
For a good Gigabit Ethernet connection with minimal packet resend conditions, host
computer performance can generally be improved by increasing the data packet size.
Each streaming video packet causes an interrupt in the host computer. Therefore
increasing the packet size reduces the CPU overhead required to handle video data from
the GigE Vision detectors.
A standard packet can have a size up to 1500 bytes. Many network cards support a jumbo
packet mode that can extend that size up to 16Kbytes. In theory, a packet could be as
large as 16 KB, but the CRC (cycle redundancy check) containing the checksum of each
packet is not as efficient when the packet size grows larger than 9000 bytes. For this
reason we advise to set the packet size to 9014 bytes (jumbo packet enabled).
