Appendix; Confirming The Wiring Design; Values Necessary For Calculating The Loss; Values Necessary For Calculating The Voltage Drop - Toa TS-800 Series Operating Instructions Manual

15. APPENDIX

(Finding the maximum cable length between the Central Unit and the Infrared Transmitter/Receiver Unit)
Values calculated here are given only as guidelines, since they can vary depending on ambient building
conditions and the Infrared Transmitter/Receiver unit.

15.1. Confirming the Wiring Design

To obtain the maximum cable length between the Infrared Transmitter/Receiver unit and the Central unit,
calculate the cable length on the following each condition. The shorter length of the two results is the required
extendable length.
(1) Maximum allowable wiring loss:
(2) Maximum allowable DC voltage drop: 5 V
Values necessary for each calculation are as follows.

15.1.1. Values necessary for calculating the loss

(1) 2-branch distributor (YW-1022) loss: 4.5 dB
(2) 4-branch distributor (YW-1024) loss: 8.5 dB
(3) Coaxial cable loss per 100 m (table shown below)
RG-59/U
RG-6/U
RG-11/U
Note: The values in the table above are losses at 10 MHz.

15.1.2. Values necessary for calculating the voltage drop

(1) Operating current per Infrared Transmitter/Receiver unit: 0.1 A (TS-905), 0.13 A (TS-907)
(2) Distributor resistance loss:
(3) Coaxial cable loop resistance per 100 m (table shown below)
RG-59/U
RG-6/U
RG-11/U
Note: The values in the table above are losses at 10 MHz.
Note: Coaxial cable loss and loop resistance values used here are based on our investigation.
20 dB (Total cable and distributor loss)
3.3 dB
2.7 dB
2.0 dB
16.82 Ω
12.82 Ω
2.4 Ω
0 Ω
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