6-4
User Guide for Cisco Digital Media Player Device Manager 5.2.x
OL-15764-03
Chapter 6 Connect to a Presentation System
Concepts
Cable Quality
The best signal cables objectively are those with the lowest signal resistance. Factors that affect signal
resistance include wire gauge, cable shielding quality, and cable connector quality. However, the same
materials and engineering designs that reduce signal resistance add to the cost of manufacturing. This
added cost is passed along to a consumer. So, it is useful to understand when signal resistance is not
relevant. Knowing this can help you to manage and reduce expenses without necessarily lowering
your standards. High cost is not inevitable. Nor is it proof of high quality. Sometimes, in fact, high
quality (low signal resistance) is irrelevant.
Even mediocre signal cables are sometimes sufficient, and such cables are often very affordable.
Figure 1 illustrates the most important factors to consider when you choose signal cables.
Figure 1 Signal Cable Purchasing Factors to Consider
Professional (non-consumer) display resolution
Lower resolution Higher resolution
Proximity of display to your DMP
Far
Near
50 ft.
or more
6 ft.
480p
1080p
Low expense
High expense
Less need for high-end
signal cables
More need for high-end
signal cables
Strong error correction
Weak error correction
Your display - Engineering design quality
25 ft.
720p
More realistic need for low signal resistance
More realistic installation scenarios
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