HP EISA/PCI Multiplexer Family Cabling, Diagnostics and Troubleshooting Manual

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Port to Device Cabling
RJ-45 Port Module and Fan Out Cable
The pinouts for all RJ-45 jacks are shown below (see Figure 4-8).
Figure 4-8 RJ-45 jack pinouts
NOTE In RS-422 terminology, RX- is sometimes labeled as RX(a) or Receive(a),
while TX- is often labeled as TX(a) or Transmit(a). The RX- signal should
be attached from the port module to the TX- signal of the device.
Please note the following cabling considerations:
• All jacks on the RJ-45 port module face the front of the product with
the key pointed down. Refer to Figure 4-7 for the modular jack wiring
orientation.
• Either twisted-pair or flat modular cable may be used as a signal path
from RJ-45 port module or fan out cable ports to peripheral devices.
However, twisted-pair cables significantly increase the operating
distance between ports and peripheral devices. Flat modular cable
may reduce the operating distance.