HP PCI Multiplexer Family Cabling, Diagnostics, and Troubleshooting Manual

Port to Device Cabling
RJ-45 Port Module and Fan Out Cable
Chapter 448
The pinouts for all RJ-45 jacks are shown below (see Figure 4-8).
Figure 4-8 RJ-45 jack pinouts
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.