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•
TPX 88A
As a stand-alone transmitter, the TP T 15HD 45 is compatible
with:
•
VTR001, VTR001 AAP, and VTR001 MAAP (RGBHV/
RGBS only)
•
TPX 88
Cable testing
To ensure proper cable termination, each transmission cable
system that uses CAT 5e or CAT 6 cable should be tested (Extron
Skew-Free cable does not need to be tested). Testing the cable
from the transmitter and receiver gives the most accurate
indications of cable problems.
There are two varieties of cable runs: simple runs, in which a
single cable is terminated only at the transmitter and receiver,
and complex runs, which can include patch bays and multiple
terminations and lengths of cable. In either case, the entire
cabling system should be tested.
A complete test measures cable length and tests the wire map,
attenuation, NEXT, PSNEXT, ELFEXT, PSELFEXT, return loss,
ACR and PSACR. All of these tests are critical for digital data
transfer. While all of these tests are important indicators of
the quality of the cable termination, the most critical testing
parameters for video transfer are wire map (T-568-A or T-568-B
termination) and pair length measurements. The largest concern
is equalization of skew between cable pairs. Cable systems of
300 feet or less should exhibit no transmission problems if they
pass at least CAT 5e or preferably CAT 6-D5 channel certification
testing.
The Microtest OMNI SCANNER 2 performs comprehensive
certification testing to the proposed CAT 6 standards. Other
manufacturers also make testing equipment. The tests include
advanced diagnostics for troubleshooting the cause and location
of many cable and termination problems. For simple installation
testing, the Microtest MICRO SCANNER PRO tests wire map
and cable length, including individual cable pair length.
Skew delay problems
CAT 5 TP cable can lead to registration errors between the red,
green, and blue video signals. Pair skew can be measured with
test equipment or identified by viewing a crosshatch test pattern
with a critical eye to determine if either the red, green, or blue
video image leads (appears to the left of) the other two video
images. These images can be minimized or eliminated by one of
the following methods:
TP T 15HD 45 and TP T A 45 • Installation
2-7
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