3Com Router 3012, Installation Manual

Page: 58 / 72

58 C
HAPTER
A: O
PTIONAL
C
ABLE
S
PECIFICATIONS
Ethernet Cable
The Ethernet cable uses an RJ-45 connector and category 5 twisted pair cable.
Table 3 describes straight-through network cable pinouts.
Table 4 describes crossover network cable pinouts.
You can use Table 4 as a reference while distinguishing or preparing the two kinds
of Ethernet cables. While preparing the Ethernet cables, follow the chromatogram
given in this table to arrange the wires. Otherwise, communication quality will be
affected even though the equipment at two ends is connected.
Table 3 Straight-through Network Cable Pinouts
RJ-45 Signal
Category 5
twisted pair
Signal Direction RJ-45
1 TX+ White (Orange) —> 1
2 TX- Orange —> 2
3 RX+ White (Green) <— 3
4 - Blue - 4
5 - White (Blue) - 5
6 RX- Green <— 6
7 - White (Brown) - 7
8 - Brown - 8
Table 4 Crossover Network Cable Pinouts
RJ-45 Signal
Category 5
Twisted Pair
Signal Direction RJ-45
1 TX+ White (Orange) —> 3
2 TX- Orange —> 6
3 RX+ White (Green) <— 1
4 - Blue - 4
5 - White (Blue) - 5
6 RX- Green <— 2
7 - White (Brown) - 7
8 - Brown - 8