Fujitsu PRIMERGY RX300 S7 Operating Manual page 61

Hardware installation
Information for ensuring electromagnetic compatibility
All data and signal cables must have sufficient shielding. The use of cable type
S/FTP Cat5 or better is recommended.
Use of unshielded or badly shielded cables may lead to increased emission of
interference and/or reduced fault-tolerance of the device.
Operating Manual 61
RX300 S7