Crestron QM-MD8x8 Spezifikationen PDF herunterladen (Seite 16)

QuickMedia Distribution System Crestron QM-MD8x8

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 QM transport mechanism (receiver) uses frequency compensation on each

twisted pair video input to maintain high resolutions (1600 x 1200) with CRESCAT-

QM cable (which contains both Cresnet and CAT5E wiring) and most good quality

CAT5E and CAT6 cables (where skew rating is ≤ 15 ns / 100 meters). The total

accumulated length of the cable determines the actual skew. For example, when

connecting the QM-WMC to a QM-MD8x8 and then to the QM-RMCRX, the total

accumulated skew must not exceed 15 ns.

NOTE: The length of CAT5/5E/6 cable that can be used can vary. However, the

total skew must be ≤ 15 ns.

NOTE: Longer lengths of cable may experience eventual loss of bandwidth when

viewing higher resolution sources.

The following diagram illustrates how composite, S-video, and RGB video signals

are transmitted over the CAT5E wire.

Quick Media Video Signals on CAT5E

NOTE: When transmitting S-video or composite video, luminance uses the green

video pathway, chrominance uses the red video pathway, and composite uses the

blue video pathway.

The pin assignments for Crescat-QM, CAT5, CAT5E, and CAT 6 wiring are based

on the EIA/TIA 568B RJ-45 Jack standard.

RJ-45 QuickMedia Connector

Pin 1

To determine which pin is number 1, hold the cable so that the end of the eight-pin

modular jack is facing you, with the clip down and the copper side up. When looking

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