Crestron QM-RMCRX, Руководство по эксплуатации

Страница: 20 / 64

QuickMedia™ Receiver/Processor Crestron QM-RMCRX
NOTE: Do not untwist the two wires in a single pair for more than 1/3-1/2"
(0.84 – 1.27 cm) when making a connection. The twists are critical to canceling
out interference between the wires.
The QuickMedia transport mechanism (receiver) performs frequency
compensation on each video input to compensate for skew. Signal skew occurs
when part of the signal is delayed with respect to other signal components. The
amount of skew largely depends on the length of the wire. Because CAT5
consists of twisted pairs that are twisted together in the cable, unequal wire
lengths are created. The total accumulated skew from source to receiver must
not exceed 15 ns (nanoseconds). Crestron recommends a cable rating of 15 ns
per 100 m (328 ft.).
For example, connecting the QM-WMC with 150 ft. of cable to a QM-MD-8x8,
and then using another 150 ft. to connect the QM-RMCRX, the accumulated
skew must not exceed 15 ns.
Longer lengths of cable may experience a loss of bandwidth when viewing at
high video resolutions.
The pin assignment is based on the EIA/TIA 568B RJ-45 Jack standard. The
following table illustrates how composite, S-video, and RGB video signals are
transmitted over the CAT5E wire.
RJ-45 QuickMedia Connector Pin and Pair Assignment
RJ-45 PIN
NUMBER CAT5E
PAIR
NUMBER WIRE COLORS
(EIA 568B) QM
ASSIGNMENT
RGB AND
AUDIO QM ASSIGNMENT
COMPOSITE,
S-VIDEO AND
AUDIO
1 2 WHITE/ORANGE - RGB RED - CHROMINANCE
2 2 ORANGE + RGB RED + CHROMINANCE
3 3 WHITE/GREEN - RGB GREEN - LUMINANCE
4 1 BLUE + AUDIO + AUDIO
5 1 WHITE/BLUE - AUDIO - AUDIO
6 3 GREEN + RGB GREEN + LUMINANCE
7 4 WHITE/BROWN - RGB BLUE - COMPOSITE
8 4 BROWN + RGB BLUE + COMPOSITE
Pin 1
Mounting
The QM-RMCRX can be mounted using the included four mounting brackets.
Attach the included brackets using the existing cover screws located on the sides
of the QM-RMCRX as shown in the following diagram.
16
•
QuickMedia™ Receiver/Processor: QM-RMCRX Operations Guide - DOC. 6236A