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INSTALLATION
5
CONFIGURATIONOPERATION
FURTHER
INFORMATION
INDEX
TIPS FOR ACHIEVING GOOD QUALITY LINKS
Due to the large volumes of data that must be transferred between the transmitter
and receiver, every AdderLink XD522 installation is highly dependent upon good quality
CATx cable links. Video performance is particularly reliant on high speed communication
channels. For this reason, the AdderLink XD522 units periodically test the link quality to
determine which of two video transfer modes can be supported: Low Rate or High Rate.
Please see Video support for details about high and low rate video modes.
The main factors that affect link quality are:
• The length and type of CATx cable used,
• The number, length and type of intermediate patch connections,
• The quality of the cable terminations.
As illustrated in the table below, the cable type has quite a marked affect on the
maximum distance that can be achieved with High Rate mode:
As mentioned above, patch links affect performance. For each additional break/patch
within a run, you will need to reduce the distance given above by roughly 5 meters.
For best results, patch cables should be of type CAT 7a and be less than 2 meters in
length. If patch cables are greater than 2 meters, then they must be CAT 7a.
Adder recommend the following CAT 7 shielded, foiled, twisted pair cables:
• Flexible patch cable Daetwyler 7702 (26AWG S/FTP)
• Bulk cable Daetwyler 7120 (23AWG S/FTP)
Essential cable properties
• A gauge (thickness) of 23AWG or
better is recommended.
• The cable screening should be: S/
FTP, S/STP or PiMF.
Please see
Appendix D - Link cable
interference protection
for details.
Low rate mode
High rate mode
To achieve 150m (in LR mode),
the cable thickness is important:
Use 23AWG (or thicker).
To achieve 100m (in HR mode),
both the thickness and screening
are important: Use 23AWG (or
thicker) with S/FTP screening.
Please see Appendix D - Link cable interference protection for details
about cable screening and shielding.