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CHAPTER 3: Installation
4. Identify the pinout of all involved video baluns and the Video CCTV-A/V
Hub to see whether you’ll need to use any cross-pinned cable. For example, if
you’re using all Video Stereo Audio Baluns (IC441A-R2), all of the UTP cable
can be straight-through-pinned. Table 3-1 shows the pinouts of several of the
baluns that can be used with the hub and straight-through-pinned cable.
Figure 3-2 shows the difference between a balun RJ-45 pinning that needs
straight-through cable (straight polarity) and one that needs cross-pinned
cable (reverse polarity).
Table 3-1. Sample balun pinouts.
IC440A
IC441A-R2 IC446A
IC447A
Video 1
7 & 8
7 & 8
7 & 8
7 & 8 Y/luminance
Video 2
N/A
N/A
4 & 5
4 & 5 C/chrominance
Audio 1
N/A
1 & 2
1 & 2
N/A
Audio 2
N/A
3 & 6
3 & 6
N/A
Figure 3-2. Connector signal polarity for the “video 2” signal.
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
R
T
R
T
Straight polarity
(ring on 4, tip on 5)
Reverse polarity
(tip on 4, ring on 5)
