Crestron QM-DA-2 QuickMedia™ Distribution Amplifier Operations Guide
This document was prepared and written by the Technical Documentation department at: Crestron Electronics, Inc. 15 Volvo Drive Rockleigh, NJ 07647 1-888-CRESTRON Regulatory Compliance As of the date of manufacture, the QM-DA-2 has been tested and found to comply with specifications for CE marking and standards per EMC and Radiocommunications Compliance Labelling. Federal Communications Commission (FCC) Compliance Statement This device complies with part 15 of the FCC rules.
Crestron QM-DA-2 QuickMedia™ Distribution Amplifier Contents QuickMedia™ Distribution Amplifier: QM-DA-2 1 Introduction ............................................................................................................................... 1 Features and Functions ................................................................................................ 1 Specifications ..............................................................................................................
Crestron QM-DA-2 QuickMedia™ Distribution Amplifier QuickMedia™ Distribution Amplifier: QM-DA-2 Introduction The QM-DA-2 is a QuickMedia™ (QM) distribution amplifier designed to distribute a single QM signal to two QM receivers. All signal distribution is provided over inexpensive CAT5e type cable via Crestron® exclusive QM transport, supporting high resolution RGB, video, stereo audio and microphone signals up to a total distance of 450 feet (137 meters).
QuickMedia™ Distribution Amplifier Crestron QM-DA-2 Specifications Specifications for the QM-DA-2 are listed in the following table.
Crestron QM-DA-2 QuickMedia™ Distribution Amplifier Physical Description This section provides information on the connections, controls and indicators available on your QM-DA-2. QM-DA-2 Physical View Operations Guide – DOC.
QuickMedia™ Distribution Amplifier Crestron QM-DA-2 QM-DA-2 Overall Dimensions (Top, Front and Bottom Views) 2 1 3 1.43 in (37 mm) 4.56 in (116 mm) 4 3.50 in (89 mm) 4.32 in (110 mm) 4.00 in (102 mm) 1 5 1 4 • QuickMedia™ Distribution Amplifier: QM-DA-2 Operations Guide – DOC.
Crestron QM-DA-2 QuickMedia™ Distribution Amplifier Connectors, Controls & Indicators # CONNECTORS1, CONTROLS & INDICATORS DESCRIPTION 1 NET2 2 QM IN3, 4, 5 (3) 4-pin 3.
QuickMedia™ Distribution Amplifier Crestron QM-DA-2 3. The eight-pin RJ-45 QuickMedia transport port accepts CAT5E/CAT6 carrying audio, video and microphone signals. The QM ports conform to the 568B wiring standard. Refer to the following table for connector pinouts.
Crestron QM-DA-2 QuickMedia™ Distribution Amplifier Setup Network Wiring When wiring the Cresnet® network, consider the following: • Use Crestron Certified Wire. • Use Crestron power supplies for Crestron equipment. • Provide sufficient power to the system. CAUTION: Insufficient power can lead to unpredictable results or damage to the equipment. Please use the Crestron Power Calculator to help calculate how much power is needed for the system (www.crestron.com/calculators).
QuickMedia™ Distribution Amplifier Crestron QM-DA-2 CresCAT-QM Cable CresCAT-QM Cable NOTE: Do not untwist the two wires in a single pair for more than 1/31/2” (8–12 mm) when making a connection. The twists are critical to canceling out interference between the wires. The aggregate cable length of a signal path originating at a QM transmitter and terminating at a QM receiver (with a QM-DA-2 in between) must not exceed 450 feet (137 meters).
Crestron QM-DA-2 QuickMedia™ Distribution Amplifier switchers or distribution amplifiers). Refer to the following diagram when configuring a QM network. NOTE: The aggregate length from transmitter to receiver cannot have a delay skew of more than 22 ns.
QuickMedia™ Distribution Amplifier Crestron QM-DA-2 Hardware Connections for the QM-DA-2 (Bottom View) NET: To Control System and Other Cresnet Devices QM OUT: QuickMedia Output Carries Audio and Video Signals NOTE: Do not connect 24 Volt power to more than one of the NET connectors on the QM-DA-2. NOTE: Ensure the unit is properly grounded by connecting the chassis ground lug to an earth ground (building steel).
Crestron QM-DA-2 QuickMedia™ Distribution Amplifier Problem Solving Troubleshooting The following table provides corrective action for possible trouble situations. If further assistance is required, please contact a Crestron customer service representative. QM-DA-2 Troubleshooting TROUBLE Device does not function. Connected QM devices are not receiving power. Poor picture or sound quality. POSSIBLE CAUSE(S) Device is not receiving power from a Crestron power source.
QuickMedia™ Distribution Amplifier Crestron QM-DA-2 QM-DA-2 Troubleshooting (Continued) TROUBLE Loss of functionality due to electrostatic discharge. POSSIBLE CAUSE(S) Improper grounding. CORRECTIVE ACTION Check that all ground connections have been made properly. Check Network Wiring Use the Right Wire Calculate Power In order to ensure optimum performance over the full range of your installation topology, Crestron Certified Wire and only Crestron Certified Wire may be used.
Crestron QM-DA-2 QuickMedia™ Distribution Amplifier Cable Length Equation 40,000 L< RxP Where: L = Length of run (or chain) in feet R = 6 Ohms (Crestron Certified Wire: 18 AWG (0.75 MM 2 )) or 1.6 Ohms (Cresnet HP: 12 AWG (4 MM 2 )) P = Cresnet power usage of entire run (or chain) Make sure the cable length value is less than the value calculated on the right side of the equation.
QuickMedia™ Distribution Amplifier Crestron QM-DA-2 Reference Documents The latest version of all documents mentioned within the guide can be obtained from the Crestron website (www.crestron.com/manuals). This link will provide a list of product manuals arranged in alphabetical order by model number.
Crestron QM-DA-2 QuickMedia™ Distribution Amplifier Return and Warranty Policies Merchandise Returns / Repair Service 1. No merchandise may be returned for credit, exchange or service without prior authorization from CRESTRON. To obtain warranty service for CRESTRON products, contact an authorized CRESTRON dealer. Only authorized CRESTRON dealers may contact the factory and request an RMA (Return Merchandise Authorization) number.
Crestron Electronics, Inc. 15 Volvo Drive Rockleigh, NJ 07647 Tel: 888.CRESTRON Fax: 201.767.7576 www.crestron.com Operations Guide – DOC. 6918A (2025920) 12.09 Specifications subject to change without notice.
