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Installing and wiring telephone power supplies
126 Installing and Connecting the MDF and Telephones
Figure 57: Connecting telephones and other end devices to the 1152B PDU
For Data-In ports connect the Ethernet cable leading from the Ethernet Switch/Hub to the Data
port. For Data & Power Out ports connect the Ethernet cable leading to the telephone or other
end device to the corresponding Data & Power port.
Note:
Note: Be certain to connect correspondingly numbered Data and Data & Power ports.
Connecting cables to telephones and other end devices
An 1152B PDU contains line-sensing capabilities that enables it to send power only to end
devices designed to receive power from the LAN. These end devices, termed Power over LAN
Enabled, receive power once they are connected to the 1152B PDU.
To safeguard devices that are not enabled, the 1152B PDU detects devices that are not enabled
so does not send power. Note that data continues to flow using the Ethernet cable regardless of
the status of the end device.
End devices that are not enabled to receive power directly may receive power and data through
an external splitter. The external splitter separates the power and data prior to connection to the
end device (see Figure 58: Connecting an IP telephone with an external splitter
on page 127).
End Device
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RJ-45 IN RJ-45 OUT
Ethernet
Switch/Hub
RJ-45
RJ-45
data
data
data
DC +
data
DC -
data
data
data
data
spare
spare
spare
spare
Data In
Data & Power Out
DC +
DC -
1152A1 Power Distribution Unit