3Com 3CRWX120695A Installation And Basic Configuration Manual page 23

Table 7 Ethernet Interfaces
Link Type Cable Type
10/100BASE-T Cat 5 copper
Straight-through or
crossover signaling
10/100 Ethernet Cable Wiring Connections on the 10/100 ports
require Category 5 (Cat 5) cable based on the EIA/TIA-586 standard. For
direct connection to a MAP access point, a router, or an end station such
as a PC, printer, or server, use a straight-through cable. For direct
connection to another switch, use a crossover cable. (The 10/100
Ethernet ports on the WX1200 switch provide automatic MDI/MDX,
which automatically crosses over the send and receive signals if required.)
Table 8 on page 23 lists the pin signals for 10/100 Ethernet
straight-through wiring. Pins 4, 5, 7, and 8 are used only when Power
over Ethernet (PoE) is enabled on the port. RD means Receive Data and
TD means Transmit Data.
Table 8 10/100 Ethernet Straight-Through Pin Signals
WX Switch
Pin Function
1 RD+
2 RD-
3 TD+
4 PoE+
5 PoE+
6 TD-
7 PoE-
8 PoE-
MAP Cable Requirement
Use a straight-through Ethernet cable to connect a MAP access point
directly to a WX switch or indirectly through another device.
Installation Requirements and Recommendations
Connector
Type
RJ-45
Other Device
Pin
1
2
3
4
5
6
7
8
Maximum
Distance
100 m
(328 feet)
Function
TD+
TD-
RD+
PoE+
PoE+
RD-
PoE-
PoE-
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