Gigabit Ethernet Switch – Hardware Manual
Page 28 of 36
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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. In addition, an RJ-45
connector must be attached to both ends of the cable.
CAUTION:
DO NOT plug a phone jack connector into any
RJ-45 port.
CAUTION:
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.
RJ-45 Connector Pin Numbers
10BASE-T/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).
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.
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
