Tips For Achieving Good Quality Links - ADDER AdderLink XD522 User Giude

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
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:
Low rate mode
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)
Video support for details
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.
Please see Appendix D - Link cable interference protection
for details about cable screening and shielding.
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.
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