Enterasys RoamAbout RBT-4102 - 10;100 BASE-TX Pin Assignments

Cables and Pinouts
B-2
10/100BASE-TX Pin Assignments
Use unshielded twisted-pair (UTP) or shielded twisted-pair (STP) cable for RJ-45
connections: 100-ohm Category 3 or better cable for 10 Mbps connections. Also be sure
that the length of any twisted-pair connection does not exceed 100 meters (328 feet).
The RJ-45 port on the access point supports automatic MDI/MDI-X operation, so you can
use straight-through or crossover cables for all network connections to PCs, switches, or
hubs. In straight-through cable, pins 1, 2, 3, and 6, at one end of the cable, are connected
straight through to pins 1, 2, 3, and 6 at the other end of the cable.
Pin MDI Signal Name MDI-X Signal Name
1 Receive Data plus (RD+)
and GND (Positive V
port
)
Transmit Data plus (TD+)
and -48V feeding power (Negative V
port
)
2 Receive Data minus (RD-)
and GND (Positive V
port
)
Transmit Data minus (TD-)
and -48V feeding power (Negative V
port
)
3
Transmit Data minus (TD+)
and -48V feeding power (Negative
V
port
)
Receive Data plus (RD+)
and GND (Positive V
port
)
4
GND (Positive V
port
) -48V feeding power (Negative V
port
)
5
GND (Positive V
port
) -48V feeding power (Negative V
port
)
6
Transmit Data minus (TD-)
and -48V feeding power (Negative
V
port
)
Receive Data minus (RD-)
and GND (Positive V
port
)
7
-48V feeding power (Negative V
port
) GND (Positive V
port
8
-48V feeding power (Negative V
port
) GND (Positive V
port
Note: The “+” and “-” signs represent the polarity of the wires that make up each wire pair.