Crestron HD-SCALER Guide d'installation télécharger pdf (Page 33)

Crestron HD-SCALER High-Definition Video Scaler

Operations & Installation Guide – DOC. 7136B High-Definition Video Scaler: HD-SCALER

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The wire gauge and the Cresnet power usage of the run should be used in the

following equation to calculate the cable length value on the equation’s left side.

Cable Length Equation

L = Length of run (or chain) in feet

R = 6 Ohms (Crestron Certified Wire: 18 AWG (0.75 mm ))

or 1.6 Ohms (Cresnet HP: 12 AWG (4 mm ))

P = Cresnet power usage of entire run (or chain)

L <

40,000

R x P

Where:

Make sure the cable length value is less than the value calculated on the right side of

the equation. For example, a Cresnet run using 18 AWG Crestron Certified Wire and

drawing 20 watts should not have a length of run more than 333 feet (101 meters). If

Cresnet HP is used for the same run, its length could extend to 1250 feet (381

meters).

NOTE: All Crestron certified Cresnet wiring must consist of two twisted pairs. One

twisted pair is the 24 and G pair and the other twisted pair is the Y and Z pair.

Strip and Tin Wire

When daisy chaining Cresnet units, strip the ends of the wires carefully to avoid

nicking the conductors. Twist together the ends of the wires that share a pin on the

network connector and tin the twisted connection. Apply solder only to the ends of

the twisted wires. Avoid tinning too far up the wires or the end becomes brittle.

Insert the tinned connection into the Cresnet connector and tighten the retaining

screw. Repeat the procedure for the other three conductors.

Add Hubs

Use of a Cresnet Hub/Repeater (CNXHUB) is advised whenever the number of

Cresnet devices on a network exceeds 20 or when the combined total length of

Cresnet cable exceeds 3000 feet (914 meters).

Further Inquiries

To locate specific information or resolve questions after reviewing this guide,

contact Crestron's True Blue Support at 1-888-CRESTRON [1-888-273-7876] or, for

assistance within a particular geographic region, refer to the listing of Crestron

worldwide offices at www.crestron.com/offices

To post a question about Crestron products, log onto Crestron’s Online Help at

www.crestron.com/onlinehelp

. First-time users must establish a user account to fully

benefit from all available features.

Future Updates

As Crestron improves functions, adds new features, and extends the capabilities of

the HD-SCALER, additional information may be made available as manual updates.

These updates are solely electronic and serve as intermediary supplements prior to

the release of a complete technical documentation revision.

Check the Crestron website periodically for manual update availability and its

relevance. Updates are identified as an “Addendum” in the Download column.

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Crestron HD-SCALER Guide d'installation Page 33

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