Toa TS-910 Series Installation - Manual (Page 55)

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• Finding the wiring loss
Requirement: Total loss
20 dB
Cable loss = (Length / 100) x Loss per 100 m
Total loss = Cable 1 loss + Cable 2 loss + Cable 3 loss + Distributor 1 loss + Distributor 2 loss
• Finding the wiring voltage drop
Requirement: Total voltage drop 5 V
Cable voltage drop = (Length / 100) x Loop resistance per 100 m x Current
Cable current
= Number of the connected Infrared Transmitter/Receiver units x 0.1 (TS-905) or 0.13 (TS-907)
Total voltage drop = Voltage drop 1 + Voltage drop 2 + Voltage drop 3
Note: For the coaxial cable required to carry a large current, use a cable of low loop resistance type.
14.1.2. Computational equation
Current 1
Voltage drop 1
Central unit
Coaxial cable 1
Current 2
Voltage drop 2
Distributor
Coaxial cable 2
Current 3
Voltage drop 3
Distributor
Coaxial cable 3
Transmitter/Receiver
unit
Coaxial cable 1 loss
Central Unit
Coaxial cable 1
Coaxial cable 2 loss
Distributor 1
Coaxial cable 2
Coaxial cable 3 loss
Distributor 2
Coaxial cable 3
Transmitter/Receiver
unit
[Finding the cable current]
Cable current = Number of the connected Infrared Transmitter/Receiver units x 0.1 (TS-905) or 0.13 (TS-907)
The cable current changes when the Distributor is used, as shown below.
Infrared
Transmitter/Receiver
units TS-905
Infrared
Transmitter/Receiver
unit TS-905
Central unit
0.2 A
Distributor1
0.1 A
0.1 A
Central unit
0.1 A