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CHAPTER 6: TECHNICAL GLOSSARY
Category 5e/6/7 (CAT5e/6/7) Network Cabling
— Category 5e/6/7 cable is commonly also referred to as CAT5e, CAT6, or CAT7.
This cabling is available in either solid or stranded twisted pair copper wire variants and as UTP (Unshielded Twisted Pair) or
STP (Shielded Twisted Pair). UTP cables are not surrounded by any shielding, making them more susceptible to electromagnetic
interference (EMI). STP cables include shielding over each individual pair of copper wires that provides better protection against EMI.
USB Cables
— USB cables have two distinct connectors. The Type A connector is used to connect the cable from a USB device
to the Type A port on a computer or hub. The Type B connector is used to attach the USB cable to a USB device.
USB Type A USB Type A
USB Type B USB Type B
port connector
port connector
FIGURE 6-1. USB CONNECTORS
RJ-45
— The Registered Jack (RJ) physical interface is what connects the network cabling (CAT5) to the local extender and remote
extender. You may use either the T568A scheme (Table 5-1) or the T568B scheme (Table 5-2) for cable termination because the
extender uses all four pairs of the cable. RJ-45 connectors are sometimes also referred to as 8P8C connectors.
RJ-45 Pin Positioning
—
TABLE 5-1. T568A WIRING
Pin
Pair
Wire
Cable Color
1
3
1
White/Green
2
3
2
Green
3
2
1
White/Orange
4
1
2
Blue
5
1
1
White/Blue
6
2
2
Orange
7
4
1
White/Brown
8
4
2
Brown
TABLE 5-2. T568B WIRING
Pin
Pair
Wire
Cable Color
1
2
1
White/Orange
2
2
2
Orange
3
3
1
White/Green
4
1
2
Blue
5
1
1
White/Blue
6
3
2
Green
7
4
1
White/Brown
8
4
2
Brown
FIGURE 6-2. T568A CONNECTOR PINOUT
FIGURE 6-3. T568B CONNECTOR PINOUT
