Reference specifications for transmission cable
Item Unit Specifications
NOTES:
• *1: Number of twist is not specified. However, it shall satisfy the electrical specifications such as
characteristic impedance, attenuation, etc. (Example: More than 40 times/m)
• *2: Cross talk attenuation is applied when the twisted cable has 2 pairs (2 P).
• Material is not specified. However, it shall be selected by considering the operating environment
(temperature, humidity) and the local regulation by the environment condition (ROHS directive, etc.).
• Mechanical specification is not specified. However, it shall be selected by considering the operating
environment.
• Never bundle transmission cable with power supply cable.
¢
Wiring rules
• In the following cases, Signal amplifier is required.
– When the total length of the transmission cable exceeded 500 m
AB + BC + BD + DE + EF > 500 m (Fig. 1)
– When total number of the units is over 64.
• When the total length of the transmission cable exceeded 500 m
• Transmission cable length between each unit: 400 m
• Total transmission cable length: 3,600 m (Fig. 2)
A
B
C
D
E
F
A
B
C
D
NS 1
NS 2
NS 4
NS 3
E
F
G
H
Transmission cable
Transmission cable
System
controller
Touch
panel
controller
Outdoor unit
Outdoor unit
Fig. 2Fig. 1
Indoor unit
Indoor unit
Terminal
resistor
Terminal resistor
When AB + BC + BD + DE + EF > 500 m,
signal amplifier is required.
Terminal
resistor
Touch
panel
controller
System
controller
Signal amplifier
NOTE: For details of maximum wiring length, refer to "VRF network system" on page 06-4.
4-3. Transmission cable - (06-56) - 4. Wiring design
SYSTEM
DESIGN
SYSTEM
DESIGN
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