Chapter 2: Overview
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Page 11
2.5 Tips for achieving good quality links
Due to the large volumes of data that must be transferred between the transmitter and receiver, every Wizard DP Extender instal-
lation is highly dependent upon good quality CATx cable links. Video performance is particularly reliant on high speed communi-
cation channels. For this reason, the Wizard DP Extender 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
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,
• 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.
We 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)
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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.
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To achieve 150m (in LR mode), the cable thickness is important: Use 23AWG (or thicker).
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To achieve 100m (in HR mode), both the thickness
and
screening are important: Use 23AWG (or thicker) with S/FTP screening.
Low rate mode
High rate mode
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3
