ADDERLink INFINITY 1002 Manual v30

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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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In simplified terms, the wrapper that is added at Layer 2 
(by the sending system) includes the physical address of 
the intended recipient system, i.e. the unique MAC address 
(for example, 09:f8:33:d7:66:12) that is assigned to every 
networking device at manufacture. Deciphering recipients 
at this level is more straightforward than at Layer 3, where 
the address of the recipient is represented by a logical IP 
address (e.g....

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General specifications
Casing (w x h x d):  198mm (7.92”) x 44mm (1.76”) x 150mm (6.0”)
Construction:    1U compact case, robust metal design 
Weight:     1.1kg (2.4lbs)
Mount kits:    Rack mount - single or dual units per 1U slot.
     VESA monitor / wall mount chassis.
Power to adapter:  100-240VAC 50/60Hz, 0.8A, 
Power to unit:   5VDC 20W
Operating temp:     0ºC to 40ºC (32ºF to 104ºF)
Approvals:    CE, FCC
9pin D-type  female9pin D-type...

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APPENDIX G - Fiber modules and cables
To suit your installation layout, two fiber modules are available for the ALIF dual units 
to suit various fiber optic cables. The specifications for all are summarized in the table 
below:   
Fiber TypeFiber sizeFiber Type CodingDistance  
at 
1Gbps
Adder part 
number for 
SFP module
Bar  
color
Conn.  
type
Normal 
Applications
Military 
Applications
Suggested Print 
Nomenclature
OM1(62.5/125)...

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Single unit rack brackets
The optional single unit brackets (plus four screws), allow 
a unit to be secured within a standard rack half width slot. 
IMPORTANT - allow space for airflow
The ALIF units and their power supplies generate heat when 
in operation and will become warm to the touch. 
Do not place them in locations where air cannot circulate 
to cool the equipment. When mounting units within a rack 
chassis, allow a 1/3rd U space...

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Double unit rack brackets
This optional kit comprises four brackets (plus twelve screws) 
and allows two ALIF units to be mounted side by side and 
fitted into a 1U rack slot.   
IMPORTANT - allow space for airflow
The ALIF units and their power supplies generate heat when 
in operation and will become warm to the touch. 
Do not place them in locations where air cannot circulate 
to cool the equipment. When mounting units within a rack...