Reference Documents - Crestron TPS-GA-TPI Operation Manual

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Specifications (22 pages)

Table Of Contents

Table of Contents

Crestron TPS-GA-TPI

Strip and Tin Wire

Add Hubs

Operations Guide – DOC. 6609A

consideration. Use Crestron Certified Wire only. If Cresnet units are to be daisy-

chained on the run, the Cresnet power usage of each network unit to be daisy-

chained must be added together to determine the Cresnet power usage of the entire

chain. If the unit is home-run from a Crestron system power supply network port, the

Cresnet power usage of that unit is the Cresnet power usage of the entire run. 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

Where:

L = Length of run (or chain) in feet

40,000

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

L <

R x P

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. 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. If Cresnet HP

is used for the same run, its length could extend to 1250 feet.

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

twisted pair is the +24V conductor and the GND conductor and the other twisted

pair is the Y conductor and the Z conductor.

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.

For larger networks (i.e., greater than 28 network devices), it may become necessary

to add a Cresnet Hub/Repeater (CNXHUB) to maintain signal quality throughout the

network. Also, for networks with lengthy cable runs it may be necessary to add a

Hub/Repeater after only 20 devices.