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Configuring Power Over Ethernet
December 2005
© Foundry Networks, Inc.
6 - 3
Figure 6.1
POE Endspan Delivery Method
Midspan
The POE Midspan solution uses an intermediate device, usually a powered device, to inject power into the
network. The intermediate device is positioned between the switch and the powered device and delivers power
over the network using the spare pairs of wires (Alternative B). The intermediate device has multiple channels
(typically 6 to 24), and each of the channels has data input and a data plus power RJ-45 output connector.
The Midspan method is illustrated in Figure 6.2.
Figure 6.2
POE Midspan Delivery Method
Switch with Power over Ethernet ports
POE Endspan Delivery Method
IP phone
Power and data signals travel
along the same pairs of wires at
different frequencies.
CONSOLE
POWER
PS1
PS2
ACT
LINK
49F
50F
FastIron Edge 4802 POE
37
38
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44
45
46
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37
49C
50C
25
26
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29
26
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11
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1
Switch
POE Midspan Delivery Method
IP phone
Power travels on unused spare
pairs while data travels on other
wire pairs.
Intermediate device
CONSOLE
POWER
PS1
PS2
ACT
LINK
49F
50F
FastIron Edge 4802 POE
37
38
39
40
41
42
43
44
45
46
47
48
48
41
38
39
40
42
47
43
44
45
46
37
49C
50C
25
26
27
28
29
30
31
32
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34
35
36
36
29
26
27
28
30
35
31
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25
13
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24
1
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1
Summary of Contents for FastIron Edge Switch X424
Page 36: ...Foundry Configuration Guide for the FESX FSX and FWSX 2 12 Foundry Networks Inc December 2005...
Page 56: ...Foundry Configuration Guide for the FESX FSX and FWSX 3 20 Foundry Networks Inc December 2005...
Page 70: ...Foundry Configuration Guide for the FESX FSX and FWSX 4 14 Foundry Networks Inc December 2005...
Page 198: ...Foundry Configuration Guide for the FESX FSX and FWSX 8 38 Foundry Networks Inc December 2005...
Page 316: ...Foundry Configuration Guide for the FESX FSX and FWSX 12 26 Foundry Networks Inc December 2005...
Page 350: ...Foundry Configuration Guide for the FESX FSX and FWSX 15 12 Foundry Networks Inc December 2005...
Page 458: ...Foundry Configuration Guide for the FESX FSX and FWSX 18 18 Foundry Networks Inc December 2005...
Page 712: ...Foundry Configuration Guide for the FESX FSX and FWSX 22 32 Foundry Networks Inc December 2005...
Page 760: ...Foundry Configuration Guide for the FESX FSX and FWSX A 34 Foundry Networks Inc December 2005...
Page 796: ...Foundry Configuration Guide for the FESX FSX and FWSX C 18 Foundry Networks Inc December 2005...
Page 820: ...Foundry Configuration Guide for the FESX FSX and FWSX E 10 Foundry Networks Inc December 2005...