Hardware Installation Manual 44 Document #: LTRT-10229
Mediant 800 MSBR
6.4 Connecting PoE-Enabled Clients to LAN Ports
The LAN ports support PoE according to the IEEE 802.3af-2003 and IEEE 802.3at
standards. The ports can transfer electrical power, along with the usual data, over the
Ethernet cable to connected equipment (e.g., IP phone) capable of receiving PoE.
The LAN ports automatically detect the presence of IEEE 802.3 compliant equipment. Upon
plugging in a PoE client to one of the ports, the device also automatically detects the class
to which the client belongs and consequently, the maximum power allowed:
IEEE 802.3af-2003: The device can supply up to 15.4W per port, and a total budget of
50W or 120W (depending on device model) for all ports:
• Class 0: configurable, up to 15.4W – refer to the User's Manual for more
information
• Class 1: up to 4W
• Class 2: up to 7W
• Class 3: up to 15.4W
IEEE 802.3at – Class 4: The device can supply up to 30W per port to the connected
equipment and a total budget of 50W, 120W, or 200W (depending on device model)
for all ports.
If the plugged-in client is detected as Class 0, the device saves the user-defined wattage
from the total wattage budget (default is 15.4W). If the plugged-in client is detected as
Class 1, Class 2, or Class 3, the device saves 4W, 7W, or 15.4W respectively from the total
wattage budget.
If the power budget has been exhausted and a new client is plugged in, no power is
available to this client. Note that the power is always taken off the total budget according to
the class detected, regardless of what is actually consumed per port.
PoE is supplied on Pins 4,5: (+), and pins 7,8: (-).
Notes:
• PoE support is a customer ordered feature.
• Upon device startup, PoE is enabled on all ports. You can enable or disable PoE
per port. For more information, refer to the User's Manual.
• For PoE support, the maximum cable length between the device's Ethernet port
and the connected equipment (e.g., IP phone) is 100 meters.
• You can configure the maximum port power consumption (up to 15.4W) used
when the plugged-in client is detected as Class 0. You can also enable Class 4
PoE per port. For more information, refer to the User's Manual.
To connect PoE-enabled equipment to the PoE-enabled LAN ports:
1. Connect one end of a straight-through RJ-45 Cat 5e or Cat 6 cable to a LAN port
enabled with PoE.
2. Connect the other end of the cable to PoE-enabled equipment (e.g., an IP Phone).
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