Knox Video R & T Cat - Manual (Page 15)

3.3 POOR AUDIO QUALITY
Amplified speakers are required. Ensure an amplifier drives the speakers.
Check input source levels from source device. Make sure the audio source is not over or under
driven.
3.4 GREEN SHIFT/GREEN WASHOUT
The standard Knox product is designed to function with DC coupled signals with the black level
referenced to 0 Volts. Nearly all VGA cards function this way. However, some media servers or
digital camera devices provide AC coupled signals and can cause a green color shift in the video.
3.5 DELAY SKEW IN UTP CABLES
Knox has long recognized the skew issue of Unshielded Twisted Pair, UTP, cable. Skew
describes timing differences where multiple cables deliver multiple signals that must arrive at the
same time. Category 5/5e/6 cables are intentionally designed such that each one of the four
twisted pairs of cable has a different twist. However, this difference in twist causes a variation in
length of the conductors. This variance of twist is intentionally done to minimize crosstalk
between the pairs. Because all four pairs work simultaneously, and each delivers a part of the
signal, the timing or ‘skew’ of the pairs is also critical to system operation. Nano-skew cable
maintains a consistent twist in between the inner pairs; this cable allows a minimal amount of
skew delay keeping the timing consistent. The electrical lengths of the conductors are
sufficiently equal to allow use for analog video networks without undue equalization. The CAT
Video Distribution System was design to be used with standard Category 5/5e/6 cables of lengths
of less than 500 feet. By using nano-skew cable that length can be doubled.