WIRE TYPE AND DISTANCE CAPACITY
Page 7 of 12
W I R E T Y P E A N D D I S T A N C E C A P A C I T Y
The distance capability of wire is dependant on its ability to deliver DC power, and separately, to deliver high-frequency
data signals.
The graph below shows maximum power delivery when using a 48V power supply. If you are using a 56V power supply,
your distances will be 2.6 times those shown in figure 4. If you are not delivering power to your camera (or other remote
device), then this graph does not apply. Figure 5 shows the maximum network data rate.
A Distance Calculator can be found at www.nvt.com.
PoE devices require a minimum of 43V to operate. With a 48V supply, we have 5V of allowable voltage drop on the wire.
With a 56V supply, we have 13V of allowable voltage drop on the wire.
The voltage will dip in proportion to the remote (camera) load. The graph below shows what distances are supported for
various loads and wire types.
●
The voltage will dip in proportion to the remote (camera) load. The graph below shows what distances are supported for
various loads and wire types.
●
Start with the Powered Device (camera) wattage at the left. Sometimes PoE devices are listed as to their PoE Class rather
than wattage. If this is the case, use the colored classes instead.
●
Now read over to the right until you find your kind of wire. Then look up (feet) or down (meters) to find your maximum wire
distance. If your wire is not among the examples, simply measure its total resistance and find that value on the right side
of the graph. The maximum supported wattage is on the left.
Figure 4 - Power Distance Chart
3.0 W
0 W
Wire Distance
Wire Distance
4.0 W
5.0 W
6.0 W
8.0 W
10 W
12 W
15 W
18 W
20 W
25 W
30 W
40 W
50 W
10
m
15
m
20
m
30
m
40
m
50
m
60
m
80
m
10
0 m
15
0 m
20
0 m
25
0 m
30
0 m
33
ft
49
ft
66
ft
98
ft
13
1 f
t
16
4 f
t
19
7 f
t
26
2 f
t
32
8 f
t
49
2 f
t
65
6 f
t
82
0 f
t
10
00
ft
T
o
ta
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ire
R
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E
P
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W
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e
2.0 W
2.5 W
24 Ω
38 Ω
23 Ω
21 Ω
19 Ω
16 Ω
14 Ω
12 Ω
11 Ω
9 Ω
7 Ω
6 Ω
4 Ω
3 Ω
28 Ω
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Figure 5 - Data Distance Chart
Wire Distance
Wire Distance
100 Mbps
90 Mbps
80 Mbps
70 Mbps
60 Mbps
50 Mbps
40 Mbps
30 Mbps
20 Mbps
10 Mbps
0 Mbps
10
m
15
m
20
m
30
m
40
m
50
m
60
m
80
m
10
0 m
15
0 m
20
0 m
25
0 m
30
0 m
33
ft
49
ft
66
ft
98
ft
13
1 f
t
16
4 f
t
19
7 f
t
26
2 f
t
32
8 f
t
49
2 f
t
65
6 f
t
82
0 f
t
10
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