4-3. Transmission cable
RELATED LINKS
"Definition
" on page 06-4
¢ W
iring specifications
Use Cable size Cable type Remarks
Transmission
cable
22 AWG
(0.33 mm
2
)
LEVEL4 (NEMA) non polar 2-core, twisted
pair solid core, diameter 0.65
mm
LonWorks compatible
cable
Use shielded cable specified below and always ground it both end.
22 AWG (0.65 mm) LEVEL4 cable with shielded (National Electrical Manufacturers Association [NE-
MA]) differs from the Category 4 specification proposed by the Electronic Industries Association/
Telecommunication Industry Association (EIA/TIA).
Reference specifications for transmission cable
Item Unit Specifications
Wire type mm
0.65 dia (22 AWG)
Twisted pair with shield
Pair (Twisted pair cable)*
1
— 1 pair or 2 pair
Loop DC resistance (68 °F [20 °C])
Ohm/1,000 ft
(Ohm/305 m)
Less than 18
DC resistance unbalancing (68 °F [20 °C]) % Less than 5
Dielectric voltage
(Between conductor and conductor)
V/min AC 350
Insulation resistance (68 °F [20 °C])
(Between conductor and conductor)
Mohm-km
More than 500
(After charging DC 500
V 1 min)
Static capacitance between
conductors
1 KHz nF/km Less than 56
Unbalanced static
capacitance (To ground)
1 KHz nF/km Less than 3.28
Characteristic impedance
772 KHz
Ohm
102±15% (87 to 117)
1 MHz
100±15% (85 to 115)
4 MHz
8 MHz
10 MHz
16 MHz
20 MHz
Attenuation
772 KHz
dB/1,000 ft
(dB/305 m)
Less than 4.5
1 MHz Less than 5.5
4 MHz Less than 11.0
8 MHz Less than 15.0
10 MHz Less than 17.0
16 MHz Less than 22.0
20 MHz Less than 24.0
Cross talk attenuation*
2
772 KHz
dB/1,000 ft
(dB/305
m)
Less than 58
1 MHz Less than 56
4 MHz Less than 47
8 MHz Less than 42
10 MHz Less than 41
16 MHz Less than 38
20 MHz Less than 36
4-3. Transmission cable - (06-54) - 4. Wiring design
SYSTEM
DESIGN
SYSTEM
DESIGN
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