User's Manual
MP-622 Installation Guide
5 – 2
The RJ-45 Input port on the power injector is wired with MDI pinouts. This means that you must
use crossover cables for connections to PCs or servers, and straight-through cable for connections
to switches or hubs. However, when connecting to devices that support automatic MDI/MDI-X
pinout configuration, you can use either straight-through or crossover cable.
Straight-Through Wiring
Because the 10/100 Mbps Input port on the power injector uses an MDI pin configuration, you
must use “straight-through” cable for network connections to hubs or switches that only have
MDI-X ports. However, if the device to which you are connecting supports automatic MDI/MDI-X
operation, you can use either “straight-through” or “crossover” cable.
Figure 5–2. Straight-Through Cable Wiring
Crossover Wiring
Because the 10/100 Mbps port on the power injector uses an MDI pin configuration, you must use
“crossover” cable for network connections to PCs, servers or other end nodes that only have MDI
ports. However, if the device to which you are connecting supports automatic MDI/MDI-X
operation, you can use either “straight-through” or “crossover” cable.
Figure 5–3. Crossover Cable Wiring
Table 5– 1. 10/100BASE-TX MDI and MDI-X Port Pinouts
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-)
4,5,7,8 Not used Not used
Note: The “+” and “-” signs represent the polarity of the wires that
make up each wire pair.
White/Orange Stripe
Orange
White/Green Stripe
Green
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
EIA/TIA 568B RJ-45 Wiring Standard
10/100BASE-TX Straight-through Cable
End A
End B
Blue
White/Blue Stripe
Brown
White/Brown Stripe
White/Orange Stripe
Orange
White/Green Stripe
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
EIA/TIA 568B RJ-45 Wiring Standard
10/100BASE-TX Crossover Cable
End A
End B
Green
Blue
White/Blue Stripe
Brown
White/Brown Stripe