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Appendix C Cables
The HP F5000 firewall supports various types of interface modules. The port types vary by the interface
module. Use dedicated cables to connect the ports of different types.
Table 33 Cables
Cable
Ethernet twisted pair cable
Optical fiber
Ethernet twisted pair cable
Introduction
An Ethernet twisted pair cable consists of four pairs of insulated copper wires twisted together. Every
wire uses a different color, and has a diameter of about 1 mm (0.04 in). A pair of twisted copper cables
can cancel the electromagnetic radiation of each other, and reduce interference of external sources. An
Ethernet twisted pair cable mainly transmits analog signals and is advantageous in transmitting data
over shorter distances. It is the commonly used transmission media of the Ethernet. The maximum
transmission distance of the Ethernet twisted pair cable is 100 m (328.08 ft). To extend the transmission
distance, you can connect two twisted pair cable segments with a repeater. At most four repeaters can
be added, which means five segments can be joined together to provide a transmission distance of 500
m (1640.42 ft).
Ethernet twisted pair cables can be classified into category 3, category 4, category 5, category 5e,
category 6, and category 7 cables based on performance. In LANs, category 5, category 5e, and
category 6 are commonly used.
Table 34 Description of commonly used Ethernet twisted pair cables
Type
Category 5
Category 5e
Category 6
Based on whether a metal shielding is used, Ethernet twisted pair cables can be classified into shielded
twisted pair (STP) and unshielded twisted pair (UTP). An STP cable provides a metallic braid between the
twisted pairs and the outer jacket. This metallic braid helps reduce radiation, prevent information from
being listened, and eliminate external electromagnetic interference (EMI) of external sources. STPs have
strict application requirements and are expensive although they provide better EMI prevention
performance than UTPs, so in most LANs, UTPs are commonly used.
Applicable port type
RJ-45 Ethernet port
SFP/XFP port
Description
Suitable for data transmission at a maximum speed of 100 Mbps
Suitable for data transmission at a maximum speed of 1000 Mbps
Suitable for data transmission at a speed higher than 1 Gbps
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Description
Connects the RJ-45 Ethernet port of
the firewall for data transmission.
Connects the fiber port of the
firewall for data transmission.
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