23
P
ORT
AND
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ABLE
A
SSIGNMENTS
Caution: DO NOT
insert a phone jack connector into any RJ-45 port.
Use only twisted-pair cables with RJ-45 connectors that
conform with FCC standards.
An Ethernet twisted-pair link segment requires two pairs of wires. Each
wire pair is identified by two different colors. Each wire pair must be
attached to the RJ-45 connector in a specific orientation detailed below.
The Ethernet port on the modem is an MDI-X port, which allows straight-
through cable connections to PCs, and to hubs and switches with MDI
ports. 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. For connection to hubs or switches which have MDI-X ports, a
crossover cable must be used.
Pin
MDI-X Signal Name
MDI Signal Name
1
Receive Data plus (RD+)
Transmit Data plus (TD+)
2
Receive Data minus (RD-)
Transmit Data minus (TD-)
3
Transmit Data plus (TD+)
Receive Data plus (RD+)
6
Transmit Data minus (TD-)
Receive Data minus (RD-)
No other pins are used.
1
8
8
1
