2. Cable is the medium through which information usually moves
from one network device to another.
There three common types of cables .
3. Twisted pair cable comes in two varieties
1. Unshielded Twisted Pair (UTP) Cable
2. Shielded Twisted Pair (STP) Cable
Unshielded twisted pair (UTP) is the most popular and is
generally the best option for LAN networks.
The cable has four pairs of wires inside the jacket.
RJ-45 (RJ stands for Registered Jack) is the standard
connector for unshielded twisted pair cabling.
4. UTP categories
Category 1 Voice only (Telephone)
Category 2 Data to 4 Mbps (Localtalk)
Category 3 Data to 10Mbps (Ethernet)
Category 4 Data to 20Mbps (Token ring)
Data to 100Mbps (Fast Ethernet)
Data to 1000Mbps (Gigabit Ethernet)
Category 6 Data to 2500Mbps (Gigabit Ethernet)
7. Cabling / Wiring / Color Coding
There are generally three main types of cabling in
Out of the 8 pins that exist on both ends of an Ethernet
cable, each pin connects to the same pin on the opposite
Straight-Through wired cables are most commonly used
to connect a host to client.
1. Straight-through cables
8. Use a straight-through cable when:
1. Connecting a router to a hub
2. Connecting a compute to a switch
3. Connecting a LAN port to a switch, hub, or computer
10. Crossover cables are very similar to straight-through
cables, except that they have pairs of wires that crisscross.
This allows for two devices to communicate at the same
Unlike straight-through cables, we use crossover cables
to connect like devices.
2. Crossover cables cables
11. Use a crossover cable when:
1. Connecting a computer to a router
2. Connecting a computer to a computer
3. Connecting a router to a router
4. Connecting a switch to a switch
5. Connecting a hub to a hub
15. Installing Cable Guidelines
When running cable, it is best to follow a few simple rules:
• Always use more cable than you need. Leave plenty of slack.
• Test every part of a network as you install it. Even if it is brand
new, it may have problems that will be difficult to isolate later.
• Stay at least 3 feet away from fluorescent light boxes and other
sources of electrical interference.
16. • If it is necessary to run cable across the floor, cover the cable
with cable protectors.
• Label both ends of each cable.
• Use cable ties (not tape) to keep cables in the same location