A
PPENDIX
B
| Cables and Pinouts
Twisted-Pair Cable Assignments
– 47 –
ES-3026/3026P
S
TRAIGHT
-T
HROUGH
W
IRING
If the twisted-pair cable is to join two ports and only one of the ports has
an internal crossover (MDI-X), the two pairs of wires must be straight-
through. (When auto-negotiation is enabled for any RJ-45 port on this
switch, you can use either straight-through or crossover cable to connect
to any device type.)
You must connect all four wire pairs as shown in the following diagram to
support Gigabit Ethernet connections.
Figure 23: Straight Through Wiring
Table 13: 10/100BASE-TX MDI and MDI-X Port Pinouts
PIN
MDI Signal Name
a
a.
The “+” and “-” signs represent the polarity of the wires that make up each wire
pair.
MDI-X Signal Name
1
Transmit Data plus (TD+)
-52V power (Negative V
port
)
Receive Data plus (RD+)
GND (Positive V
port
)
2
Transmit Data minus (TD-)
-52V power (Negative V
port
)
Receive Data minus (RD-)
GND (Positive V
port
)
3
Receive Data plus (RD+)
GND (Positive V
port
)
Transmit Data plus (TD+)
-52V power (Negative V
port
)
4
-52V power (Negative V
port
)
GND (Positive V
port
)
5
-52V power (Negative V
port
)
GND (Positive V
port
)
6
Receive Data minus (RD-)
GND (Positive V
port
)
Transmit Data minus (TD-)
-52V power (Negative V
port
)
7
GND (Positive V
port
)
-52V power (Negative V
port
)
8
GND (Positive V
port
)
-52V power (Negative V
port
)
White/Orange Stripe
Orange
White/Green Stripe
Green
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
EIA/TIA 568B RJ-45 Wiring Standard
10/100BASE-TX Straight-Through Cable
End A
End B
Blue
White/Blue Stripe
Brown
White/Brown Stripe
