ADDERLink INFINITY dual 2112T Manual v30 2112T

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APPENDIX C - Tips for success when networking ALIF units
ALIF units use multiple strategies to minimize the amount of data that they send 
across networks. However, data overheads can be quite high, particularly when very 
high resolution video is being transferred, so it is important to take steps to maximize 
network efficiency and help minimize data output. The tips given in this section have been 
proven to produce very beneficial...

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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...

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APPENDIX D - Troubleshooting
Problem: The video image of the ALIF receiver shows horizontal lines across 
the screen. 
This issue is known as Blinding because the resulting video image looks as though you’re 
viewing it through a venetian blind. 
When video is transmitted by ALIF units, the various lines of each screen are divided up 
and transmitted as separate data packets. If the reception of those packets is disturbed, 
then blinding is...

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Problem: The mouse pointer of the ALIF receiver is slow or sluggish when 
moved across the screen.
This issue is often related to either using dithering on the video output of one or more 
transmitting computers or using VGA-to-DVI video converters.
Dithering is used to improve the perceived quality and color depth of images by diffusing 
or altering the color of pixels between video frames. This practice is commonly used 
on Apple Mac...

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APPENDIX E - Glossary
Internet Group Management Protocol
Where an ALIF transmitter is required to stream video to 
two or more receivers, multicasting is the method used. 
Multicasting involves the delivery of identical data to 
multiple receivers simultaneously without the need to 
maintain individual links. When multicast data packets enter 
a subnet, the natural reaction of the switches that bind 
all the hosts together within the...

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Spanning Tree Protocol (STP)
In order to build a robust network, it is necessary 
to include certain levels of redundancy within the 
interconnections between switches. This will help to 
ensure that a failure of one link does not lead to a 
complete failure of the whole network.
The danger of multiple links is that data packets, especially 
multicast packets, become involved in continual loops as 
neighbouring switches use the duplicated...

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Forwarding modes
In essence, the job of a layer 2 switch is to transfer as 
fast as possible, data packets arriving at one port out to 
another port as determined by the destination address. 
This is known as data forwarding and most switches offer 
a choice of methods to achieve this. Choosing the most 
appropriate forwarding method can often have a sizeable 
impact on the overall speed of switching:
• Store and forward is the original...

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APPENDIX F - Configuration menus (via VNC)
When viewing remotely via VNC, the unit has a main configuration menu through which 
you can access various sub menus to configure particular items.
To view the main configuration menu
1 Using VNC viewer or a browser, log on as the ‘admin’ user.
2 Click the ‘Configure’ button in the top right corner. The main configuration menu will 
be displayed:
The various configuration pages are covered within...

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User accounts
Up to 16 users can be created by the admin user, each with their password. One of the 
16 users can be the admin user. This user has access to the units configuration menu. 
Ticking the ‘IsAdmin’ box creates the Admin user. The admin user can also determine 
whether the users are allowed access to the power control menu in order to turn 
servers on and off.
To get here
1 Using VNC viewer or a browser, log on as the ‘admin’...

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Gui edit configuration
If required, you can customize the menu bar of the viewer window to ensure that it 
contains only the necessary options. 
The menu bar can be edited locally by each user or edited singly by the admin or 
alternatively, the admin can globally alter the menu bar for all users.
To globally edit the menu bar via admin
1 Using VNC viewer or a browser, log on as the ‘admin’ user.
2 Click the ‘Configure’ button in the top...