ADDER ADDERLink INFINITY 4000, User Manual, Page: 36 / 82

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Configuring the switches and devices
The layout is vital but so too is the configuration:
• Enable
IGMP Snooping on all L2 switches.
• Ensure that IGMP Fast-Leave is enabled on all switches with ALIF units connected
directly to them.
• Enable the L3 switch as an IGMP Querier .
• Enable Spanning Tree Protocol (STP) on all switches and importantly also enable
portfast (only) on all switch ports that have ALIF units connected.
• If any hosts will use any video resolutions using 2048 horizontal pixels (e.g. 2048 x
1152, 2048 x 2048), ensure that Jumbo Frames are enabled on all switches.
• Choose an appropriate forwarding mode on all switches. Use Cut-through if available,
otherwise Store and forward .
• Optimize the settings on the ALIF transmitters:
• If moving video images are being shown frequently, then leave Frame Skipping at a
low percentage and instead reduce the Peak bandwidth limiter.
• Where screens are quite static, try increasing the Background Refresh interval and/
or increasing the Frame skipping percentage setting.
Make changes to the ALIF transmitters one at a time, in small steps, and view typical
video images so that you can attribute positive or negative results to the appropriate
control.
• Ensure that all ALIF units are fully updated to the latest firmware version (at least v2.1).