ADDERLink INFINITY Manual V33

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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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General specifications
Casing (w x h x d):  198mm (7.92”) x 44mm (1.76”) x 120mm (4.8”)
Construction:  1U compact case, robust metal design 
Weight:   0.75kg (1.65lbs)
Mount kits:     Rack mount - single or dual units per 1U slot.
     VESA monitor / wall mount chassis.
Power to adapter:  100-240VAC 50/60Hz, 0.5A, 
Power to unit: 5VDC 12.5W
Operating temp:   0ºC to 40ºC (32ºF to 104ºF)
Approvals:     CE, FCC
9pin D-type  female9pin D-type...

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WARRANTY
Adder Technology Ltd warrants that this product shall be free from defects in 
workmanship and materials for a period of two years from the date of original purchase. 
If the product should fail to operate correctly in normal use during the warranty period, 
Adder will replace or repair it free of charge. No liability can be accepted for damage due 
to misuse or circumstances outside Adder’s control. Also Adder will not be...

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RADIO FREQUENCY ENERGY
A Category 5 (or better) twisted pair cable must be used to connect the units in order 
to maintain compliance with radio frequency energy emission regulations and ensure a 
suitably high level of immunity to electromagnetic disturbances.
All other interface cables used with this equipment must be shielded in order to maintain 
compliance with radio frequency energy emission regulations and ensure a suitably high...

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www.ctxd.com Documentation by:
© 2014 Adder Technology Limited
All trademarks are acknowledged.
Part No. MAN-ALIF1000 • Release 3.3a
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Contact:  www.adder.com/contact-details
Support: forum.adder.com