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
Modular Cables
To support device-to-system connections at higher speeds over longer
distances, customers may build their own cables using modular
components. These cables commonly terminate on one end with an RJ-45
modular plug (connector) which fits into the modular jack on the port
module or fan out cable, and on the other end with a DB-25 or DB-9
connector, depending on the type of the device.
NOTE Modems require a 10 wire interface cable connection for full CCITT
modem control. Directly connected devices may use a 3-wire interface
cable if hardware flow-control is not used. Although the port modules use
10-pin modular jacks, the signal pinouts are arranged such that 8-wire,
6-wire, or 4-wire modular plugs may be used. Since the receive and
transmit signals (and ground) are on the inner four wires, a 4-wire
connection may be made to direct connect devices.
Figures 4-9 through 4-12 illustrate cabling schemes for various types of
devices. These cables are not offered by Hewlett Packard but may be
customer fabricated or purchased from other sources.