Publication date: Nov, 2014
Revision A1.1
29
CABLES
TWISTED-PAIR
CABLE AND PIN
ASSIGNMENTS
For 10/100BASE-TX connections, the twisted-pair cable must
have two pairs of wires. For 1000BASE-T connections the
twisted-pair cable must have four pairs of wires. Each wire pair is
identified by two different colors. For example, one wire might be
green and the other, green with white stripes. Also, an RJ-45
connector must be attached to both ends of the cable.
C
AUTION
:
DO NOT plug a phone jack connector into any RJ-45
port. Use only twisted-pair cables with RJ-45 connectors that
conform with FCC standards.
C
AUTION
:
Each wire pair must be attached to the RJ-45
connectors in a specific orientation.
The figure below illustrates how the pins on the RJ-45 connector are numbered. Be sure to
hold the connectors in the same orientation when attaching the wires to the pins.
Figure 19: RJ-45 Connector Pin Numbers
10BASE-T/100BA
SE-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).
The RJ-45 ports on the switch base unit support automatic
MDI/MDI-X operation, so 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 11: 10/100BASE-TX MDI and MDI-X Port Pinouts
Pin
MDI Signal Name
MDI-X Signal Name
1
Transmit Data plus (TD+)
Receive Data plus (RD+)
2
Transmit Data minus (TD-)
Receive Data minus (RD-)
3
Receive Data plus (RD+)
Transmit Data plus (TD+)
6
Receive Data minus (RD-)
Transmit Data minus (TD-)
4, 5, 7, 8
Not used
Not used
