Installation guide

Crestron CEN-RFGW-EX infiNET EX Wireless Gateway

Operations & Installation Guide – DOC. 6706G infiNET EX Gateway: CEN-RFGW-EX • 23

connected must be taken into 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 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

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).