SMC Networks 6826MPE, Installation Manual

Page: 70 / 94

C
ABLES
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, 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 and PoE power are delivered on the standard two wire pairs (pins 1,
2, 3, and 6). 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-X and MDI Port Pinouts
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
and GND (Positive V
port
)
Transmit Data minus (TD-)
and -48V feeding power
(Negative V
port
)
3
Transmit Data plus (TD+)
and -48V feeding power
(Negative V
port
)
Receive Data plus (RD+)
and GND (Positive V
port
)
6
Transmit Data minus (TD-)
and -48V feeding power
(Negative V
port
)
Receive Data minus (RD-)
and GND (Positive V
port
)
4, 5, 7, 8
Not used Not used
Note: The “+” and “-” signs represent the polarity of the wires that make up
each wire pair.