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2.2
Selection of the correct PoE (commercially available)
For the selection of a PoE switch please observe the following points:
All ABB-Welcome IP devices "meet" standard IEEE802.3af
■
According to IEEE802.3af the PoE loads may each "draw" a maximum of 12.95 Watt.
■
The minimum band width amounts to 100 Mbps.
■
ABB-Welcome IP devices must be operated with a PoE switch that meets standard 802.3af.
■
–
During selection observe that the absolute output on the PoE switch is adequate for all
devices to be connected. Do not load the PoE switch to its limit. Include a power buffer
of at least 20% when calculating the total output.
Example for the selection of a PoE switch
IP touch 7"
IP touch 5"
outdoor station
Guard unit
Smart Access
Point Pro
IP actuator
Table 2: Determination of total output of the devices to be connected
Result
Number of necessary ports:
Necessary total output:
Table 3: Result of total output of the devices to be connected
Switch selection
Example of switch
1
Example of switch
2
Table 4: Examples of switches
The example of switch 1 is not sufficient for requirements. Its total output is too small.
■
The example of switch 2 meets the requirements and can be used.
■
System Manual 2CKA000073B9795
Power (W) per
Current (A)
necessary port
0.3
8.1
0.4
10.8
0.085
2.295
0.375
10.125
0.03
0.81
10
88.57 W
IEEE802.3af
Total output
ready
Yes
76
Yes
112
Overview of product range
Number of
Total output (W)
devices
6
1
1
1
1
10
Difference
Number of ports
(Output to
necessary output)
10
-12.57 W
10
23.34 W
48.6
10.80
2.30
10.13
0.81
88.57
│7
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