Table B-1 10/100Base-Tx Mdi And Mdi-X Port Pinouts - SMC Networks 6824MPE INT - annexe 1 Installation Manual

C
ABLES
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, or 100-ohm Category 5 or better cable for 100 Mbps
connections. Also be sure that the length of any twisted-pair connection does
not exceed 100 meters (328 feet).
Data is delivered on the standard two wire pairs (pins 1, 2, 3, and 6), and PoE
power is supplied using the two previously spare pairs (pins 4, 5, 7, and 8).
Since the RJ-45 ports on the switch base unit support automatic MDI/
MDI-X operation, you can use straight-through cables for all network
connections to PCs or servers, or to other 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.
When using any RJ-45 port on this switch, you can use either
straight-through or crossover cable.

Table B-1 10/100BASE-TX MDI and MDI-X Port Pinouts

Pin MDI Signal Name
1 Receive Data plus (RD+)
2 Receive Data minus (RD-)
Transmit Data plus (TD+)
3
GND (Positive V
4
GND (Positive V
5
Transmit Data minus (TD-)
6
-48V feeding power (Negative V
7
-48V feeding power (Negative V
8
Note: The "+" and "-" signs represent the polarity of the wires that make up each
wire pair.
B-2
)
port
)
port
port
port
MDI-X Signal Name
Transmit Data plus (TD+)
Transmit Data minus (TD-)
Receive Data plus (RD+)
GND (Positive V
GND (Positive V
Receive Data minus (RD-)
) -48V feeding power (Negative V
) -48V feeding power (Negative V
)
port
)
port
)
port
)
port