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Power-over-Ethernet Guidelines
Table 10: 1000BASE-T MDI and MDI-X Port Pinouts
Pin
MDI Signal Name
1
Bi-directional Pair A Plus (BI_DA+)
-52V power (Negative V
2
Bi-directional Pair A Minus (BI_DA-)
-52V power (Negative V
3
Bi-directional Pair B Plus (BI_DB+)
GND (Positive V
)
port
4
Bi-directional Pair C Plus (BI_DC+)
-52V power (Negative V
5
Bi-directional Pair C Minus (BI_DC-)
-52V power (Negative V
6
Bi-directional Pair B Minus (BI_DB-)
GND (Positive V
)
port
7
Bi-directional Pair D Plus (BI_DD+)
GND (Positive V
)
port
8
Bi-directional Pair D Minus (BI_DD-)
GND (Positive V
)
port
1000BASE-T Cable Requirements
All Category 5 UTP cables that are used for 100BASE-TX connections should also
work for 1000BASE-T, providing that all four wire pairs are connected. However, it is
recommended that for all critical connections, or any new cable installations,
Category 5e (enhanced Category 5) or Category 6 cable should be used. The
Category 5e and 6 specifications include test parameters that are only
recommendations for Category 5. Therefore, the first step in preparing existing
Category 5 cabling for running 1000BASE-T is a simple test of the cable installation
to be sure that it complies with the IEEE 802.3-2008 standards.
The switch supports both IEEE 802.3af and IEEE 802.3at-2009 PoE standards that
enable DC power to be supplied from the switch's RJ-45 copper ports to connected
devices by utilizing certain wire pairs in the connecting Ethernet cable.
The total PoE power delivered by all ports cannot exceed the 390 W switch power
budget. This means that up to 12 ports can supply a maximum 30 W of power
simultaneously to connected devices, or all 24 ports can supply a maximum of
15.4 W simultaneously. For each attached PoE-compliant device, the switch
automatically senses the load and dynamically supplies the required power.
Any PoE-compliant device attached to a port can directly draw power from the
switch over the Ethernet cable without requiring its own separate power source.
This capability gives network administrators centralized power control for devices
MDI-X Signal Name
Bi-directional Pair B Plus (BI_DB+)
)
GND (Positive V
port
Bi-directional Pair B Minus (BI_DB-)
)
GND (Positive V
port
Bi-directional Pair A Plus (BI_DA+)
-52V power (Negative V
Bi-directional Pair D Plus (BI_DD+)
)
GND (Positive V
port
Bi-directional Pair D Minus (BI_DD-)
)
GND (Positive V
port
Bi-directional Pair A Minus (BI_DA-)
-52V power (Negative V
Bi-directional Pair C Plus (BI_DC+)
-52V power (Negative V
Bi-directional Pair C Minus (BI_DC-)
-52V power (Negative V
– 33 –
Chapter 6
| Port Connections
Power-over-Ethernet Guidelines
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