9-59
RJ-45
Signal
Direction
DB-9
5
GND
-
5
6
RXD
→
2
7
DSR
→
6
8
CTS
→
8
Micro USB console cable
A micro USB console cable is used to connect the micro USB console port on the firewall to the USB
port on a configuration terminal (a PC for example):
•
Connect the USB Type A connector of the cable to the USB port on the configuration terminal.
•
Connect the USB Type mini-A/B connector to the micro USB console port on the firewall.
Figure9-2 Micro USB console cable
Table9-2 Micro USB console cable pinouts
USB Type A
connector
Signal
USB Type mini-A/B
connector
Signal
1
VBUS
1
VBUS
2
D-
2
D-
3
D+
3
D+
4
ID(NC)
4
GND
5
GND
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.
Type A connector
Type B connector
