
Chapter 2 Campus Infrastructure Considerations
Power to IP Phones
2-18
Cisco IP Telephony Network Design Guide
78-11103-03
As shown in Figure 2-7, the patch panel has two ports per connection: one port on
the switch side and one port on the phone side.
Figure 2-7 Power Patch Panel Connectivity to Cisco IP Phone
This arrangement of applying power to the phone uses all four pairs in the
Category 5 cable. Unlike the inline method, Ethernet pairs do not carry power
signals. Rather, the remaining pairs of Category 5 cable are used for delivering
power from the patch panel (see Figure 2-8).
4 pairs
(8 wires)
2 pairs
(4 wires)
Switch side
RJ-45
Phone side
RJ-45
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246
135
246
48
47
48
47
IP IP
IP
IP
IP
40775
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