Black Box 4-Port USB 2.0 Extender over LAN, IC408A manual Technical Glossary, Page

Chapter 5: Technical Glossary

5. Technical Glossary

Category 5 (CAT5) Network Cabling — Category 5 cable is commonly also referred to as CAT5. 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. Category 5 has been superseded by CAT5e cabling, which includes improved data integrity to support high-speed communications.

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 5-1. USB cables.

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 5-2. T568A connector pinout.

Figure 5-3. T568B connector pinout.

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